This article's lead sectionmay be too short to adequately summarize the key points. Please consider expanding the lead to provide an accessible overview of all important aspects of the article.(January 2024)
This is geometrically an inverted Wankel engine that operates on the high-efficiency hybrid cycle.[1][2] In the Wankel, the only successful pistonless rotary engine to date, a figure-eight-like epitrochoid housing surrounds a curved sided triangular rotor. The rotor revolves around a fixed gear in a hula-hoop motion. The output shaft revolves at three times the speed of the rotor. One power pulse is delivered in one revolution of the output shaft. For comparison a single cylinder four-stroke piston engine delivers one power pulse for two rotations of the output shaft. The three operating chambers of the Wankel formed by the triangular rotor are separated by seals installed on the three apexes of the rotor. They require elaborate lubrication, and in older designs have been a weak point for the engine's durability. The LiquidPiston design reverses the shapes: a figure-eight-shaped rotor moves within a triangular housing. The required seals (both face and apex) are mounted on the stationary housing, which makes lubrication much easier. Common to both concepts is the use of ports to supply air and remove exhaust gas, thereby eliminating the need for valves.
Operating principleedit
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 directly injected being allowed to combust fully under constant volume conditions, which is how Otto cycle combustion is modelled. Finally, the combustion products are expanded to atmospheric pressure, utilizing the Atkinson cycle.
Feasibilityedit
In order to use the Diesel cycle efficiently, high compression ratios are required: Typical engines use between 15:1 and 24:1. The LiquidPiston engine was demonstrated on the Diesel cycle with a compression ratio as high as 26:1.[3] This would generally rule out the use of low-octane fuels like gasoline. Therefore a spark-ignited variant with lower compression was developed. This so-called "X-Mini" is a 70 cc air-cooled naturally aspirated four-stroke X-Engine, and has been demonstrated on gasoline, kerosene, Jet A fuel, propane and hydrogen.[4]
Referencesedit
^Shkolnik, Nikolay; Shkolnik, Alexander (2006). High Efficiency Hybrid Cycle Engine. ASME Internal Combustion Engine Division 2006 Spring Technical Conference.
^Nabours, Stephen; Shkolnik, Alexander; Shkolnik, Nikolay; Nelms, Ryan; Gnanam, Gnanaprakash (April 2010). . Society of Automotive Engineers, World Congress. Detroit, MI, US. Paper 2010-01-1110. Archived from the original on February 29, 2012.
^Warwick, Graham (June 20, 2018). "Liquid Piston's Rotary Engine Could Boost UAS, Accelerate eVTOLs". Aviation Week Network. Retrieved December 19, 2020.
^Nichols, Greg (June 25, 2021). "LiquidPiston engine now runs on hydrogen". ZDNet. Retrieved January 4, 2023.
engine, this, article, lead, section, short, adequately, summarize, points, please, consider, expanding, lead, provide, accessible, overview, important, aspects, article, january, 2024, type, pistonless, rotary, engine, manufactured, liquidpiston, bloomfield, . This article s lead section may be too short to adequately summarize the key points Please consider expanding the lead to provide an accessible overview of all important aspects of the article January 2024 The X engine is a type of pistonless rotary engine manufactured by LiquidPiston of Bloomfield Connecticut X engine cycle The red line is a three lobe epitrochoid which is the shape of the LiquidPiston s swept volume The X engine is a hybrid cycle rotary engine Contents 1 Design 2 Operating principle 3 Feasibility 4 References 5 External linksDesign editThis is geometrically an inverted Wankel engine that operates on the high efficiency hybrid cycle 1 2 In the Wankel the only successful pistonless rotary engine to date a figure eight like epitrochoid housing surrounds a curved sided triangular rotor The rotor revolves around a fixed gear in a hula hoop motion The output shaft revolves at three times the speed of the rotor One power pulse is delivered in one revolution of the output shaft For comparison a single cylinder four stroke piston engine delivers one power pulse for two rotations of the output shaft The three operating chambers of the Wankel formed by the triangular rotor are separated by seals installed on the three apexes of the rotor They require elaborate lubrication and in older designs have been a weak point for the engine s durability The LiquidPiston design reverses the shapes a figure eight shaped rotor moves within a triangular housing The required seals both face and apex are mounted on the stationary housing which makes lubrication much easier Common to both concepts is the use of ports to supply air and remove exhaust gas thereby eliminating the need for valves Operating principle editThis 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 directly injected being allowed to combust fully under constant volume conditions which is how Otto cycle combustion is modelled Finally the combustion products are expanded to atmospheric pressure utilizing the Atkinson cycle Feasibility editIn order to use the Diesel cycle efficiently high compression ratios are required Typical engines use between 15 1 and 24 1 The LiquidPiston engine was demonstrated on the Diesel cycle with a compression ratio as high as 26 1 3 This would generally rule out the use of low octane fuels like gasoline Therefore a spark ignited variant with lower compression was developed This so called X Mini is a 70 cc air cooled naturally aspirated four stroke X Engine and has been demonstrated on gasoline kerosene Jet A fuel propane and hydrogen 4 References edit Shkolnik Nikolay Shkolnik Alexander 2006 High Efficiency Hybrid Cycle Engine ASME Internal Combustion Engine Division 2006 Spring Technical Conference 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 Warwick Graham June 20 2018 Liquid Piston s Rotary Engine Could Boost UAS Accelerate eVTOLs Aviation Week Network Retrieved December 19 2020 Nichols Greg June 25 2021 LiquidPiston engine now runs on hydrogen ZDNet Retrieved January 4 2023 External links editX engine at Curlie LiquidPiston Inc official site Integza tour of the engine nbsp This technology related article is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title X engine amp oldid 1218304636, wikipedia, wiki, book, books, library,
