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Recently there was test of a 3D printed Rotating detonation rocket engine by nasa. The duration of the firing was 251 seconds and the engine produced a thrust of 26KN, to contexutalize this value, spacex falcon 9 merlin engine has a thrust of 410 KN. This bruning duration is typical for a lander touchdown or a deepspace burn of a spacecraft to moon or mars, the engine could be used in principle also in a upper stage of a rocket.   The Advantages of Rotating Detonation engines are that no moving parts are needed and therefore the engine is less complex than a turbopump engine. Also in theory this would mean that the engine costs less and is simpler to manufacture. Besides the simplicity advantages Rotating Detonation engines could increase combustion efficiency by up to 25 percent. In comparison to this an closed cycle engine which is much more complex than a open cycle engine has only a 10 % combusiton efficiency gain. Therefore a huge amount of fuel saving could be achieved with a rotating detonation engine.   The concept behind a rotating detonation engine is relatively easy explained. Combustion process with a flamefrontspeed lower than sound are called deflagration processes and are typical for normal rocket engines. Combustion Processes where the Flamefront expands at speeds higher than sound are called Detonation processes. Here the Flamefront produces a Shockwave. The speed of the Falmefront can be easily varied with the mixture ratio of fuel and oxidizer.  The efficiency gain of detonation engines can be explained thorugh the higher pressure rise in detonation processes.   To have continous thrust, Detonation waves are introduced into an annular chamber with a oixidizer and fuel inlet. The detonation Waves travel along the chamber walls, with mulitple waves chasing each other. This process is self sustaining because the combustion products are pushed out by the incoming fuel and oxidizer. #Nasa #Space #Engineering #Technology #rockets
Recently there was test of a 3D printed Rotating detonation rocket engine by nasa. The duration of the firing was 251 seconds and the engine produced a thrust of 26KN, to contexutalize this value, spacex falcon 9 merlin engine has a thrust of 410 KN. This bruning duration is typical for a lander touchdown or a deepspace burn of a spacecraft to moon or mars, the engine could be used in principle also in a upper stage of a rocket. The Advantages of Rotating Detonation engines are that no moving parts are needed and therefore the engine is less complex than a turbopump engine. Also in theory this would mean that the engine costs less and is simpler to manufacture. Besides the simplicity advantages Rotating Detonation engines could increase combustion efficiency by up to 25 percent. In comparison to this an closed cycle engine which is much more complex than a open cycle engine has only a 10 % combusiton efficiency gain. Therefore a huge amount of fuel saving could be achieved with a rotating detonation engine. The concept behind a rotating detonation engine is relatively easy explained. Combustion process with a flamefrontspeed lower than sound are called deflagration processes and are typical for normal rocket engines. Combustion Processes where the Flamefront expands at speeds higher than sound are called Detonation processes. Here the Flamefront produces a Shockwave. The speed of the Falmefront can be easily varied with the mixture ratio of fuel and oxidizer. The efficiency gain of detonation engines can be explained thorugh the higher pressure rise in detonation processes. To have continous thrust, Detonation waves are introduced into an annular chamber with a oixidizer and fuel inlet. The detonation Waves travel along the chamber walls, with mulitple waves chasing each other. This process is self sustaining because the combustion products are pushed out by the incoming fuel and oxidizer. #Nasa #Space #Engineering #Technology #rockets

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