爆震频率对脉冲爆震发动机性能影响的试验研究

Effect of Operation Frequency on Pulse Detonation Engine Performance

从影响脉冲爆震发动机爆震频率的因素出发,采用汽油为燃料,空气为氧化剂,研究了爆震频率对脉冲爆震发动机性能的影响。试验测取了各个爆震频率下稳定爆震的化学当量比范围,同时测试了不同工况下的爆震波压力、推力及爆震波速,发现当爆震频率较低时,发动机的工作范围较宽,爆震波压力、波速接近充分发展的理想爆震波,说明已产生了稳定、充分发展的爆震,脉冲爆震发动机的平均推力随着爆震频率的提高接近线性增大;但是随着爆震频率的提高,它的稳定工作范围变窄,爆震的强度降低。

Using gasoline as fuel and air as oxidizer, we studied experimentally the effect of operation frequency on pulse detonation engine （PDE） performance in order to analyze the factors that influence the operation frequency of the PDE prototype. We succeeded in obtaining the equivalence ratio ranges of stable operation for different operation frequencies. We measured the detonation pressure, transient thrust and detonation velocity of the PDE prototype at different operation frequencies and different equivalence ratios. Figs. 2 through 7 in the full paper show the shapes of detonation waves at different detonation frequencies; Figs. 8 and 9 display respectively the equivalence ratios of stable operation and average thrusts at different detonation frequencies; Table 1 presents the thrusts and wave speeds at different detonation frequencies. The experimental results indicate： the stable operation range is wide when the detonation frequency is low, the measured detonation wave pressure and detonation velocity are close to the theoretical values of stable and fully-developed detonation wave, and the average thrust of PDE increases almost linearly with its operation frequency; but the stable operation range becomes smaller when the detonation frequency gets higher progressively. However, the detonation strength decreases with increasing detonation frequency.