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为研究旋转爆震发动机的工作特性,在以H_2/air为推进剂的发动机模型上进行试验,利用离子探针和高频压力传感器分别采集火焰信号和压力信号,改变空气质量流量,分析并对比了高、低质量流量下发动机的点火、稳定传播及熄火过程中火焰和压力波的变化情况。结果表明:火焰与压力波的主频相同,是耦合传播的,传播速度可达1 660 m/s;对于低质量流量(75.37 g/s),靠近燃烧室入口的离子探针的离子信号峰值大于远离燃烧室入口的离子信号峰值;对于高质量流量(102.125 g/s),远离燃烧室入口的离子探针的离子信号峰值大于较近点的离子信号峰值;新鲜反应物填充对靠近燃烧室入口的点的作用时间长于较远的点;压力信号瞬时频率的相对标准差小于火焰信号;小流量的点火时间短于大流量;切断H_2供给后火焰比压力波更早熄灭。
In order to study the operating characteristics of a rotary detonation engine, experiments were carried out on an engine model with H_2 / air propellant, and the flame signal and pressure signal were collected by ion probe and high-frequency pressure sensor respectively to change the air mass flow rate. The analysis and comparison High and low mass flow engine ignition, stable propagation and flame and pressure wave changes in the flameout process. The results show that the main frequency of the flame is the same as that of the pressure wave, and the propagation velocity is up to 1 660 m / s. For the low mass flow (75.37 g / s), the ion signal peak near the entrance of the combustion chamber Is larger than the ion signal peak far away from the combustion chamber inlet; for high mass flow (102.125 g / s), the ion signal peak far away from the entrance of the combustion chamber is larger than the ion signal peak near the point; The point of entry is longer than the farther point; the relative standard deviation of the instantaneous frequency of the pressure signal is smaller than the flame signal; the ignition time of the small flow is shorter than that of the large flow; the flame is extinguished earlier than the pressure wave after the supply of H_2 is cut off.