Investigation On The Thrust Performance Of Rotating Detonation Engine

Rotating Detonation Engine (RDE) has broad application prospects in propulsion field of the future. Therefore, this thesis focuses on the performance of rotating detonation engine, and experimental and numerical investigations on Rotating Detonation Engine were carried out.In order to study the influence of different nozzles、combustion chamber length、laval nozzle throat size and expansion ratio、total mass flow rate and equivalence ratio on the performance of rotating detonation engine, a horizontal thrust test bed of rotating detonation engine was designed. The inside and outside diameter of RDE combustion chamber were 70mm and 80mm, respectively. The length of the combustion chamber was 40mm. Air and H2 were used as fuel and oxidant respectively. The RDE was ignited by the high-energy spark plugs and the thrust was measured with a piezoelectric force sensor. A reduced kinetic mechanism based on 7-step reaction and 8 specie was used to simulate Three_Dimensional RDE with separate supply of Air and H2. And the numerical simulation results are compared with the experimental results. The experiment and numerical simulation show:(1)The change of combustion chamber length has little influence on the propulsion performance of the engine, but a great influence on RDE stability work scope.(2) There is an optimum equivalent ratio range, in which the propulsion performance of engine reaches the best.(3)The increase of inlet mass flow rate, can make the thrust and specific impulse of engine keep the tendency of increase with the approximate linear.(4)Laval nozzle has the greatest potential to improve the propulsion performance of engine. Within the RDE stabilitily work scope, the propulsion performance of RDE with smaller laval nozzle throat width is better. The appropriate nozzle expansion ratio has a great influence on the propulsion performance of engine with different inlet mass flow rate.(5)Small nozzle throat width and large inlet mass flow rate are two very important factors which lead to double wave mode. Double wave mode greatly decreases the thrust eccentric torque of engine.