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Expander rocket cycle. Expander rocket engine (closed cycle). Heat from the nozzle and combustion chamber powers the fuel and oxidizer pumps. The expander cycle is a power cycle of a bipropellant rocket engine. In this cycle, the fuel is used to cool the engine's combustion chamber, picking up heat and changing phase.
The expander cycle that the engine uses drives the turbopump with waste heat absorbed by the engine combustion chamber, throat, and nozzle. This, combined with the hydrogen fuel, leads to very high specific impulses ( I sp ) in the range of 373 to 470 s (3.66–4.61 km/s) in a vacuum.
The regenerator is the key component invented by Robert Stirling, and its presence distinguishes a true Stirling engine from any other closed-cycle hot air engine. Many small 'toy' Stirling engines, particularly low-temperature difference (LTD) types, do not have a distinct regenerator component and might be considered hot air engines; however ...
The YF-79 is a liquid cryogenic rocket engine burning liquid hydrogen and liquid oxygen in a closed expander cycle. It is China's fourth generation of upper stage cryogenic propellant engine, after the YF-73, YF-75 and the YF-75D. It can do multiple restarts thanks to an electric spark igniter and a prototype was tested at 60% and 100% (25 ...
Animation of a two-stroke engine. A two-stroke (or two-stroke cycle) engine is a type of internal combustion engine that completes a power cycle with two strokes of the piston (one up and one down movement) in one revolution of the crankshaft in contrast to a four-stroke engine which requires four strokes of the piston in two crankshaft revolutions to complete a power cycle.
These engines may be based on a number of thermodynamic cycles encompassing both open cycle devices such as those of Sir George Cayley [3] and John Ericsson [4] and the closed cycle engine of Robert Stirling. [5] Hot air engines are distinct from the better known internal combustion based engine and steam engine.
The Bajulaz six-stroke engine was invented in 1989 by Roger Bajulaz of the Bajulaz S.A. company, based in Geneva, Switzerland; it has U.S. patent 4,809,511 and U.S. patent 4,513,568. The Bajulaz six-stroke engine features claimed are: Reduction in fuel consumption by at least 40%; Two expansion (work) strokes in six strokes
Nordberg's distinctive design of diesel pancake engine, used for pumping. The company was founded by Bruno V. Nordberg and Jacob Elias Friend in 1886 in Milwaukee. Nordberg had previously been working at steam engine and sawmill maker E. P. Allis & Co. [2] Friend became the company's president, [3] and later his son, Robert E. Friend, was president and chief executive officer.