Positive displacement machines : Modern design innovations and tools
- Authors: Sultan, Ibrahim , Phung, Truong
- Date: 2019
- Type: Text , Book
- Relation: Positive Displacement Machines: Modern Design Innovations and Tools
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- Description: Positive Displacement Machines: Modern Design Innovations and Tools explains the design and workings of a wide range of positive displacement pumps, compressors and gas expanders. Written at a mathematical and technical level, the book explores the most influential research in this field over the past decade, along with industry best practices. Sections highlight the importance of using the latest computation techniques and discuss how to follow the proper design procedures to achieve a desired outcome. © 2020 Elsevier Inc. All rights reserved.
Improving torque performance in reciprocating compressors via asymmetric stroke characteristics
- Authors: Sultan, Ibrahim , Phung, Truong
- Date: 2019
- Type: Text , Book chapter
- Relation: Positive Displacement Machines: Modern Design Innovations and Tools p. 145-162
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- Description: Reciprocating compressors enjoy a considerable popularity in industry due to their ability to attain high pressure levels at a range of crankshaft speeds. This chapter is intended to show that it is possible to obtain a considerable improvement in the performance of these compressors by modifying the design of their drives. Instead of the traditional slider-crank mechanism which has been used as a drive since the compressor industry started, it is now possible to replace this drive by more sophisticated ones which feature more flexible stroke designs. The chapter will offer a mathematical model for the workings of reciprocating compressor and demonstrate a candidate drive linkage. An example, presented at the end of the chapter, will demonstrate how the candidate drive linkage is optimized to reduce the torque acting on the compressor crank shaft and hence improve operation and reduce the stresses acting on various components. © 2020 Elsevier Inc. All rights reserved.
Introduction
- Authors: Sultan, Ibrahim , Phung, Truong
- Date: 2019
- Type: Text , Book chapter
- Relation: Positive Displacement Machines: Modern Design Innovations and Tools p. xiii-xv
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Improving torque performance in reciprocating compressors via asymmetric stoke characteristics
- Authors: Sultan, Ibrahim , Phung, Truong
- Date: 2019
- Type: Text , Book chapter
- Relation: Positive displacement machines : Modern design innovations and tools Chapter 6 p. 145-162
- Full Text: false
- Reviewed:
- Description: This chapter is intended to show that it is possible to obtain a considerable improvement in compressor performance and reliability by modifying the design of the compressor drive. Instead of the traditional slider-crank mechanism, which has been used as a drive since the compressor industry started, it is now possible to replace this drive by more sophisticated ones which offer more flexible stroke design. Such replacement has been made possible by the modern manufacturing methods and analysis tools which are currently at the disposal of industry and research bodies. Earlier work in the domain of proposing new linkages to drive positive displacement machines can be found in the work by Ooi and Wan (2000) who presented a proposal to drive the compressor piston directly from the back using a camlike mechanism. Also, Mimmi and Pennacchi (2001) proposed a pump drive that produces four variable-length strokes per crank revolution. On the other hand, Sultan and Kalim (2011) presented a five-bar geared linkage which can be used to drive a reciprocating compressor instead of the conventional slider-crank mechanism. The next section will present a mathematical model for the compressor operation.
Characterization of limacon gas expanders with consideration to the dynamics of apex seals and inlet control valve
- Authors: Phung, Truong , Sultan, Ibrahim
- Date: 2018
- Type: Text , Journal article
- Relation: Journal of Engineering for Gas Turbines and Power Vol. 140, no. 12 (2018), p. 1-11
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- Description: Limacon machine, of which the relative motion between the rotor and housing follows the limacon curve, belongs to a class of rotary positive displacement machines. The profiles of rotors and housings of those machines can be constructed of either limacon or circular curves, hence the names: limacon-to-limacon, circolimacon, and limacon-to-circular machines. This paper presents the investigation into the thermodynamic performance of the limacon-to-circular machines with the presence of apex seals and inlet valve. This paper sets out by briefly introducing the limacon technology and the construction of the limacon-to-circular machine working volume. The mathematical descriptions of ports positions and areas have also been introduced. The paper then discusses the flow and phase composition of working fluid through the working chambers as well as how the fluid velocity is modeled and calculated. Then the seal dynamic model and response of inlet valve are presented followed by the machine thermodynamic model. A case study has also been presented to show the responses of seals and inlet valve during the machine operation.
Design of limaçon gas expanders
- Authors: Phung, Truong , Sultan, Ibrahim , Boretti, Alberto
- Date: 2016
- Type: Text , Book chapter
- Relation: Nonlinear Approaches in Engineering Applications : Advanced Analysis of Vehicle Related Technologies Chapter 3 p. 91-119
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- Description: Limaçon is a simple and yet reliable technology, which can be employed to manufacture gas expanders to extract work or electrical power from low-grade heat or solar power resources; Limaçon technology can also be applied to smallscale power generation applications or can be used to improve energy efficiency of existing processes. Sultan (Journal of Mechanical Design, 787-793, 2006) and Sultan and Schaller (Journal of Engineering for Gas Turbines and Power, 2011) have come up with an optimum design of Limaçon-to-Limaçon expanders based on their thermodynamics performance; the design presented a model to calculate the cross-sectional area as well as the velocity of fluid flow through the inlet and discharge ports. However, the problem of optimum geometric characteristics of the inlet and discharge manifolds and the best parameters of various Limaçon embodiments are left to be solved.Additionally, the effect of the phase change on the expander performance is yet to be investigated. Aim of this document is to provide the framework of the Limaçon machines to achieve optimum expander geometries for power generation systems with various types of working fluids. © Springer International Publishing Switzerland 2016.
Improving process efficiency by waste heat recuperation: An Application of the limaçon technology
- Authors: Sultan, Ibrahim , Phung, Truong , Alhelal, Alhelal
- Date: 2016
- Type: Text , Book chapter
- Relation: Sustainability in the Mineral and Energy Sectors Chapter 25 p. 475-498
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- Description: Sustainable practices within the mining and energy sectors are assuming greater significance due to uncertainty and change within the global economy and safety, security, and health concerns. This book examines sustainability issues facing the mining and energy sectors by addressing six major themes: Mining and Mineral Processing; Metallurgy and Recycling; Environment; Energy; Socioeconomic and Regulatory; and Sustainable Materials and Fleets. Emphasizing an integrated transdisciplinary approach, it deliberates on optimizing mining productivity and energy efficiency and discusses integrated waste management practices. It discusses risk management, cost cutting, and integration of sustainable practices for long-term business value. It gives a comprehensive outlook for sustainable mineral futures from academic and industry perspectives covering mine to mill optimization, waste, risk and water management, improved efficiencies in mining tools and equipment, and performance indicators for sustainable developments. It covers how innovation and research underpin management of natural resources including sustainable carbon management.
On the apex seal analysis of limaçon positive displacement machines
- Authors: Phung, Truong , Sultan, Ibrahim , Appuhamillage, Gayan
- Date: 2018
- Type: Text , Journal article
- Relation: Mechanism and Machine Theory Vol. 127, no. (2018), p. 126-145
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- Description: Rotary machines, and limaçon machines in particular, offer a better power to weight ratio compared to reciprocating machines; however, leakage due to improper apex and side sealing have prevented rotary machines from thriving. In this paper, a modelling approach is presented to analyse the vibration of apex seal during the machine operation and the power loss caused by the seal friction. The seal and spring are modelled as a spring-mass system in which the seal deformation is negligible. The seal-groove relative positions have then been categorised into nine different possible cases based on the number of contact points between the seal and the seal groove. A case study has been presented to demonstrate the reliability of the model.
On the design of a class of rotary compressors using bayesian optimization
- Authors: Lu, Kui , Phung, Truong , Sultan, Ibrahim
- Date: 2021
- Type: Text , Journal article
- Relation: Machines Vol. 9, no. 10 (2021), p.
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- Description: The optimization process of compressors is usually regarded as a ‘black-box’ problem, in which the mathematical form underlying the relationship between design parameters and the design objective is impractical and costly to be obtained. To solve the ‘black-box’ problem, Bayesian optimization has been proven as an accurate and efficient method. However, the application of such a method in the design of compressors is rarely discussed, particularly no work has been reported in terms of the positive displacement type compressor. Therefore, this paper aims to introduce the Bayesian optimization to the design of positive displacement compressors through the optimization process of the novel limaçon compressor. In this paper, a two-stage optimization process is presented, in which the first stage optimizes the geometric parameters as per design requirements and the second stage focuses on revealing an optimum setting of port geometries that improves machine performance. A numerical illustration is offered to prove the validity of the presented approach. © 2021 by the authors. Licensee MDPI, Basel, Switzerland.
Geometric design of the limaçon machine
- Authors: Sultan, Ibrahim , Phung, Truong
- Date: 2019
- Type: Text , Book chapter
- Relation: Positive displacement machines : Modern design innovations and tools Chapter 3 p. 63-93
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- Description: Positive displacement machines have acquired particular popularity with the current push for sustainable energy production and consumption. It is currently not acceptable to waste energy available in high-pressure gasses throttled or vented to atmosphere in industrial processes (Samuel, 2007; Shu, Yu, Tian, Wei, & Liang, 2014) or blown out of cylinders in large diesel engines (Amann, 1987; Panesar, 2015; Karvountzis-Kontakiotis, Pesiridis, Zhao, Alshammari, et al., 2017). For such applications, a suitably sized positive displacement machine would be employed to harvest energy from these gases and transform it into useful forms. Turbines that are traditionally employed in massive power plants cannot be used for energy harvesting applications due to their inability to handle neither two-phase vapors (Groniewsky, Gy€orke, & Imre, 2017) nor flow occurring at small rates. For these applications, a gas expander, which is a positive displacement machine is usually employed. In relation to pressure creation, positive displacement pumps and compressors are commonly employed to impart pressure to respectively gaseous and liquid fluids flowing at rates which are required by most industries. This chapter presents the limac¸on rotary positive displacement machine, which can be employed for energy production (i.e., as a gas expander) and energy consumption (i.e., as a compressor or a pump) with equal ease and effectiveness. The limac¸on machine (Sultan, 2005) offers a straightforward technology, which has occurred to many creative minds as evident by patents which can be traced back to the 19th century. However, it is unfortunate that such technology did not make it to mass production due to the lack of mathematical understanding of their geometric characteristics and unavailability of manufacturing tools required to machine their chambers. Recently, however, with technical papers published on the topic, industry take-up of the technology has started to emerge. A good example of this take up is shown by the patent of Nystrom (2016).
Geometric design of the limaçon-to-circular fluid processing machine
- Authors: Phung, Truong , Sultan, Ibrahim
- Date: 2021
- Type: Text , Journal article
- Relation: Journal of Mechanical Design, Transactions of the ASME Vol. 143, no. 10 (2021), p.
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- Description: A limaçon machine is a rotary positive displacement device, in which the housing and rotor are constructed of limaçon of Pascal curves. Previous works have been published to investigate the working of these machines in two applications: gas expanders and compressors. This article presents a theoretical investigation into the potential of modifying the rotor profile of the limaçon machines to simplify the machine's manufacturing process and to reduce production cost. The proposed modification will produce new characteristics for the housing-rotor interaction. An outcome that motivates the need to obtain new mathematical models to investigate the housing-rotor interference and describe the volumetric relationship of the new machine. This article also employs an optimization approach to design the best machine for a given set of operating conditions, i.e., expander, compressor, and pump. The outcome of this study confirms the validity of the proposed modification and its potential to produce a limaçon machine with favorable characteristics. Copyright © 2021 by ASME
Designs and applications of the rotary limaçon compressors and expanders - a review
- Authors: Belfiore, Christopher , Lu, Kui , Phung, Truong , Sultan, Ibrahim
- Date: 2022
- Type: Text , Conference paper
- Relation: 3rd International Conference on Energy and Power, ICEP 2021, Chiang Mai, Thailand, 18-20 November 2021, AIP Conference Proceedings Vol. 2681
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- Description: Limaçon machines are positive displacement fluid processing machines that belong to the rotary machine family. The limaçon machines can be utilized as expanders to extract work from the working fluid or as compressors to provide energy to the working fluid. The main components of the limaçon machine that are directly involved in fluid processing are the housing and rotor, the construction of which are of either limaçon of Pascal curves or circular curves. One distinct feature of the limaçon machine is the limaçon motion of the rotor; the rotor rotates about and slides along a pole, o, inside a housing during the machine operation. Of important note is the motion of the machine rotor inside the housing always follows the limaçon motion irrespective of their profiles. In this paper, different designs and embodiments of the limaçon machine and their advantages and disadvantages have beed discussed, and the research has been carried out on specific applications, i.e., expander and compressor including the work done on fluid induction, sealing and leakages, porting, and inlet and outlet valve control of such machines. © 2022 American Institute of Physics Inc.. All rights reserved.
Geometric design of the limaçon rotary compressor using bayesian optimization
- Authors: Lu, Kui , Sultan, Ibrahim , Phung, Truong
- Date: 2022
- Type: Text , Conference paper
- Relation: 3rd International Conference on Energy and Power, ICEP 2021, Chiang Mai, Thailand, 18-20 November 2021, AIP Conference Proceedings 2681 Vol. 2681
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- Description: In the design of positive displacement compressors, the mathematical relationship between design parameters and design objectives is usually impractical and costly to be extracted, making the optimization process becomes a 'black-box' problem. In the available literature, the Bayesian optimization method, compared to other optimization techniques, has been proven as an accurate and efficient method to solve the 'black-box' problem. However, the application of such a method in the design of the rotary compressor has not been discussed in published papers. Hence, the current study is intended to employ Bayesian optimization to geometric design a class of positive displacement compressors, which is known as the limaçon compressor. In this paper, the geometric characteristics of the limaçon compressor are presented, and a function, which incorporates volumetric and geometric aspects, is employed to evaluate the optimization process and to reveal the optimum design scenario as per design requirements. A case study is offered to prove the validity of the presented approach. © 2022 American Institute of Physics Inc.. All rights reserved.
A comparative study of two embodiments of the limaçon rotary compressor based on theoretical modelling of apex seal dynamics and leakage
- Authors: Lu, Kui , Sultan, Ibrahim , Phung, Truong
- Date: 2023
- Type: Text , Journal article
- Relation: International Journal of Refrigeration Vol. 145, no. (2023), p. 467-480
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- Description: As an emerging technology, the limaçon rotary compressor possesses great potential for fluid-processing applications. However, the technology and associated cost required to fabricate the limaçon machine could sometimes be beyond the capability of some manufacturers. To reduce the production cost, circolimaçon embodiment whose rotor and housing are constructed of circular arcs has been proposed. This paper is intended to investigate the viability of the circolimaçon embodiment of limaçon technology based on sealing performance. A nonlinear three-degree of freedom model is presented to describe the dynamic behaviour of the apex seal during the machine operation. Additionally, the leakage through the seal-housing gap is formulated by considering the inertia and viscous effects on the flow. A numerical illustration is offered to compare the performance of the circolimaçon embodiment with that of the limaçon-to-limaçon (L2L) type machine at different pressure ratios and operating speeds. The effect of limaçon aspect ratio on the apex seal dynamics is also investigated. Based on the results, it is found that the circolimaçon embodiment exhibits comparable performance to the L2L-type machine, despite having more significant seal vibrations. The differences in the volumetric and isentropic efficiencies between the two machines are found within 8% and 3%, respectively. Additionally, it is also discovered that the circolimaçon compressor with a small capacity undergoes lower level of seal dynamics, suggesting a better machine reliability. © 2022
A literature review of the positive displacement compressor : current challenges and future opportunities
- Authors: Lu, Kui , Sultan, Ibrahim , Phung, Truong
- Date: 2023
- Type: Text , Journal article , Review
- Relation: Energies Vol. 16, no. 20 (2023), p.
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- Description: Positive displacement compressors are essential in many engineering systems, from domestic to industrial applications. Many studies have been devoted to providing more insights into the workings and proposing solutions for performance improvements of these machines. This study aims to present a systematic review of published research on positive displacement compressors of various geometrical structures. This paper discusses the literature on compressor topics, including leakage, heat transfer, friction and lubrication, valve dynamics, port characteristics, and capacity control strategies. Moreover, the current status of the application of machine learning methods in positive displacement compressors is also discussed. The challenges and opportunities for future work are presented at the end of the paper. © 2023 by the authors.
Mathematical modeling and parametric study of the limaçon rotary compressor
- Authors: Lu, Kui , Sultan, Ibrahim , Phung, Truong
- Date: 2022
- Type: Text , Journal article
- Relation: International Journal of Refrigeration Vol. 134, no. (2022), p. 219-231
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- Description: In this paper, a class of rotary positive displacement compressors which is known as the limaçon compressor is introduced. The main feature of such a compressor is that profiles of its housing and rotor and the motion of its rotor are developed from a mathematical curve called the limaçon of Pascal. A mathematical model of the limaçon compressor, which incorporates the mass flow of the working fluid, the leakage loss, the dynamic response of the discharge valve, as well as the thermodynamic behaviors, is formulated, and the simulation of such a model has been performed to study the operational characteristics of the limaçon compressor. A parametric analysis is also conducted to investigate the effects of various parameters on the compressor performance. Based on the results, it is found that the machine performance deteriorates as the operating speed increases despite an initial rise in the volumetric efficiency. Additionally, the isentropic efficiency appears insensitive to the change of the pressure ratio, whereas a negative effect on the volumetric efficiency is noticed when the pressure ratio is increased. The effect of the valve diameter on the over-compression loss has also been studied, and the result indicates that a smaller valve diameter leads to a higher level of fluid over-compression. © 2021 Elsevier Ltd and IIR
A study on the use of machine learning methods to improve reciprocating compressor reliability via torque tailoring
- Authors: Lu, Kui , Sultan, Ibrahim , Phung, Truong
- Date: 2021
- Type: Text , Conference paper
- Relation: 2021 International Conference on Maintenance and Intelligent Asset Management, ICMIAM 2021, Ballarat, Australia, 12-15 December 2021, 2021 International Conference on Maintenance and Intelligent Asset Management, ICMIAM 2021
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- Description: Reciprocating compressors have found popularity in applications where compressed air is required at high pressure levels with moderate flow rates. The mechanical drives used for these compressors are based on the traditional slider-crank linkage which, despite its simplicity, does not lend itself to optimization effort aimed at improving the compressor reliability and performance. The work presented in this paper adopts the notion that the mechanical reliability of the compressor drive is limited by the level and cyclical variability of the loads transmitted through its members and the effectiveness of its cooling system. In the paper, machine learning methods will be employed to craft an objective function suitable to use in a Bayesian optimization effort undertaken to produce a more reliable compressor drive. A numerical example is presented to prove the validity of the presented method and its suitability for use in real life compressor designs. © 2021 IEEE.