- Title
- The orbital displacer: Implications and applications
- Creator
- Spark, Ian; Lu, Kui
- Date
- 2019
- Type
- Text; Book chapter
- Identifier
- http://researchonline.federation.edu.au/vital/access/HandleResolver/1959.17/174533
- Identifier
- vital:14867
- Identifier
-
https://doi.org/10.1016/B978-0-12-816998-8.00001-7
- Identifier
- ISBN:9780128169988 (ISBN)
- Abstract
- The significance of the orbital displacer may well extend well beyond its application as the basis of a four-stroke internal combustion engine. For example, its inherently high swept volume to total volume ratio can be further increased by combining the original orbital displacer with an everted (i.e. inside-out) orbital displacer to form a hybrid orbital displacer with an even higher swept volume to total volume ratio. Furthermore, the orbital motion of the piston can be used to open and close ports to produce any desired port timing with the same frequency as the orbiting of the piston. These together with other pertinent features will be considered under the following headings: 1. Introduction, 2. Swept volume to total volume ratio, 3. Working volume as a function of crank angle, 4. Minimum geometrically necessary clearance volume as a function of displacer geometry, 5. Valveless port timing, 6. Support of the orbiting piston and vanes, 7. Balancing of the orbital piston and vanes, 8. Sealing of the working volume, 9. Frictional losses and lubrication, 10. Combustion in orbital displacers, 11. Cooling of orbital engines, 12. Manufacturing processes and materials. The above pertinent features will be discussed with reference to the following applications of the orbital displacer: orbital two-stroke engine, orbital hydraulic pumps and motors, orbital pneumatic compressors and motors, orbital Rankine (steam) engine, and orbital 6 cc model aircraft engine. Engineering students have found orbital displacer projects stimulating in the originality required, as they invariably had to go back to first principles to solve problems. © 2020 Elsevier Inc. All rights reserved.
- Publisher
- Elsevier
- Relation
- Positive Displacement Machines: Modern Design Innovations and Tools p. 3-35
- Rights
- Metadata is freely available under a CCO license
- Rights
- Copyright @ 2019 Elsevier Inc. All rights reserved.
- Subject
- Orbital displacer; Orbital piston; Port timing; Positive displacement machine; Swept volume; Volume ratio
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