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针对现有条件下电磁阀高频与大流量不可兼得的矛盾,设计了一种凸轮式旋转阀,以此来控制脉冲爆震火箭发动机氧化剂、燃料和隔离气体的间歇式供给。基于该旋转阀,以汽油和富氧空气为推进剂,进行了不同频率下的实验。实验结果表明,推进剂和隔离气供给压力与点火相位直接影响到能否稳定起爆。随着频率的增加,在1～10 Hz范围内,降低隔离氮气压力、调整点火相位可实现发动机的稳定工作;10 Hz以上时,仅需要提高油气的供给压力。基于该旋转阀控制技术,脉冲爆震火箭发动机实现了工作频率30 Hz的稳定工作。
Aiming at the contradiction between high-frequency and high-flow rate of solenoid valve in current condition, a rotary valve with cam is designed to control the intermittent supply of oxidant, fuel and isolation gas for pulse detonation rocket engine. Based on this rotary valve, gasoline and oxygen-enriched air were used as propellants to conduct experiments at different frequencies. The experimental results show that the propellant and the isolated gas supply pressure and the ignition phase directly affect the stability of the initiation. With the increase of frequency, it can reduce the pressure of isolated nitrogen and adjust the ignition phase to achieve steady operation of the engine in the range of 1 to 10 Hz. When the frequency is more than 10 Hz, only the supply pressure of oil and gas needs to be increased. Based on the rotary valve control technology, the pulse detonation rocket engine achieves a stable operation of a working frequency of 30 Hz.