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From Wikipedia, the free encyclopedia

The LiquidPiston engine is a pistonless rotary engine that operates on the high-efficiency hybrid cycle.[1][2] This cycle consists of compressing air (with no fuel) to a very high ratio, as is typical in the Diesel cycle. The air is then isolated in a constant volume chamber. Fuel is injected and allowed to combust fully under constant volume conditions, which is how Otto cycle combustion is modeled. Finally, the combustion products are expanded to atmospheric pressure, utilizing the Atkinson cycle.

In the Wankel engine, the only successful pistonless rotary engine to date, an oval-like epitrochoid housing surrounds a curved sided triangular rotor. The three operating chambers thus formed are separated by seals installed on the three apexes of the rotor. These seals move in and out during each rotation, and are subjected to high stresses and wear; as a result they have been the limiting factor in longevity of such engines.

The LiquidPiston design reverses the shapes: an oval rotor moves within a triangular housing. The required seals (both face and apex) are mounted on the stationary housing, and are lubricated directly.

In order to use the Diesel cycle efficiently, high compression ratios are required. Typical piston diesel engines use between 15:1 and 24:1. The projected compression ratio of the LiquidPiston engine is 26:1.[3]

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Transcription

References

  1. ^ Shkolnik, Nikolay; Shkolnik, Alexander (2006). High Efficiency Hybrid Cycle Engine. ASME Internal Combustion Engine Division 2006 Spring Technical Conference.
  2. ^ Nabours, Stephen; Shkolnik, Alexander; Shkolnik, Nikolay; Nelms, Ryan; Gnanam, Gnanaprakash (April 2010). 2010 SAE World Congress: High Efficiency Hybrid Cycle Engine. Society of Automotive Engineers, World Congress. Detroit, MI, US. Paper 2010-01-1110. Archived from the original on February 29, 2012.
  3. ^ Warwick, Graham (June 20, 2018). "Liquid Piston's Rotary Engine Could Boost UAS, Accelerate eVTOLs". Aviation Week Network. Retrieved December 19, 2020.

External links

This page was last edited on 15 August 2021, at 14:57
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