双波对撞模态下的液态燃料旋转爆轰发动机推力测试研究

Thrust Measurement of Liquid-fueled Rotating Detonation Engine under Two-wave Collision Mode

在环形阵列式连续旋转爆轰发动机上,以汽油/富氧空气为工质,分析了双波对撞模态下爆轰波自持的传播特征、时域频域特征和爆轰波高度,测量了发动机模型在双波对撞模态下的一维推力。试验结果表明:在富氧空气(34.3%O_2和65.7%N_2)流量为945.3 g/s、汽油流量为84.3 g/s、当量比为0.82的工况下,爆轰波平均传播频率为2.174 k Hz,平均传播速度为1 051 m/s,爆轰波高度在55~70 mm之间,有效推力为607.3 N,单位面积推力8.587×104N/m2,燃料比冲为735.1 s.推力曲线表明:双波对撞模态下发动机推力波动较大,推力围绕推力平均值振荡,稳定工作阶段发动机振动频率与爆轰波传播频率基本一致。

The ring-shaped arrangement continuous rotating detonation engine, in which the mixture of gasoline/oxygen-enriched air is injected, is test. The propagation characteristics, time-domain character- istics, frequency-domain characteristics and detonation height of self-sustained detonation wave under two-wave collision mode are analyzed in detail. One-dimensional thrust of the engine model under two- wave collision mode is measured. The experimental results show that the detonation has an average fre- quency of 2. 174 kHz and an average velocity of 1 051 m/s, the detonation wave height is between 55 and 70 mm, the effective thrust is 607.3 N, the thrust per unit area is 8. 587 × 104 N/m2 , and the fuel specif- ic impulse is 735. 1 s under the operating conditions of 0.82 equivalence ratio, 945.3 g/s oxygen- enriched air （34. 3% 02 and 65.7% N2） and 84.3 g/s gasoline. It shows that the engine thrust under two-wave collision mode fluctuates obviously, the thrust oscillates around the average thrust, and the vibration frequency of engine and the propagation frequency of detonation wave are basically identical at the stable phase in the thrust curve.