直排型DF/HF化学激光器双喷管模型启动特性

 建立了一套直排型DF/HF化学激光器气流通道双喷管小型实验装置，通过选择不同副气流总压（模拟燃烧室气流）进行实验，研究了副气流总压对双喷管实验装置启动特性的影响。实验结果表明：随着副气流总压的增大，装置的启动压力降低，盲腔条件下的启动压力明显高于有副气流时的启动压力。因此，先通入燃烧室气流，再开通引射气流，对直排型连续波DF/HF化学激光器的启动是有利的。采用1维处理方法，建立了从引射气流喷管入口、副气流喷管入口到扩压器出口的理论模型，得到了与实验一致的规律。由于1维理论中采用了一些近似处理，实际启动压力比理论数据高20%～31%。

Starting characteristic of double-nozzle model in directly drained CW DF/HF chemical lasers

To study the starting characteristic of directly drained CW DF/HF chemical laser(DDCL), a double-nozzle small-scale device of DDCL gas channel was set up, and a series of experiments were conducted with different stagnation pressure of secondary flow. The effect of stagnation pressure in secondary flow on the starting characteristic was studied, and the experimental results show that greater stagnation pressure of secondary flow results in lower starting pressure of experimental device, the starting pressure without secondary flow is obviously higher than that with secondary flow, thus it is helpful to start DDCL with combustor flow. An theoretical model from the entrance of nozzles to the exit of diffuser is constructed by using one-dimension method. The change law of the starting pressur