Research On Kerosene/Air Pulse Detonation Engine-Effect Of Air-and Fuel-injection On Performance

Pulse detonation engine (PDE) is a new concept propulsion device based on the detonation combustion of a fuel/air mixture, which has great potential for development and application. Based on the model of kerosene as the fuel and air as the oxidants for the pulse detonation, this thesis launched investigations of the effect of inlet temperature, equivalence ratio, air flow and oxygen content of the gas mixture on the characteristics of detonation wave, the results are as follows:Evaporation tube aero-valve was designed and its numerical simulation was analyzed. On the one hand, the aero-valve can cause the kerosene to evaporate better by using the heat of detonation combustion, on the other hand, the aero-valve can make the gaseous kerosene mix with air sufficiently.Effects of inlet temperature on the characteristic of detonation wave were investigated. Results show that the increase of the inlet temperature can cause the kerosene to evaporate better and improve the characteristic parameters of the detonation wave. When the temperature hit 473K, the increasing of the inlet temperature has little effect on the characteristic parameters of the detonation wave.Effects of equivalence ratio on the characteristic of detonation wave were investigated. Results show that the real equivalence ratio is smaller than the designed equivalence ratio. When the inlet temperature is 373K or 423K, the raise of the equivalence ratio can increase the parameters of detonation wave. When the inlet temperature is 473K or 523K, the equivalence ratio is 1.1, the best parameters of detonation wave was attained, if the equivalence ratio >1.1, the parameters of detonation wave will decrease.Effects of air flow on the characteristic of detonation wave were investigated. Results show that detonation wave can be formulated under the flow rate of 0.25kg/s or 0.3kg/s. When the flow rate is 0.3kg/s, the characteristic parameter of detonation wave is better than that of the 0.25kg/s model. When the flow rate is 0.4kg/s, the stable detonation wave can't be attained.Effects of the oxygen content of gas mixture in the mixture were investigated. Results show that t the oxygen content of gas mixture has key importance on formulating the detonation waves. The pressure of the combustion wave goes down with the decrease of the volume of oxidant. When t the oxygen content of gas mixture is less than 21.3%, PDE can't work in a stable condition; When the oxygen content of gas mixture is less than 19%, PDE can't work.