直排型DF/HF化学激光器扩压器喉道最佳长度实验研究
Experimental investigation on optimal length of diffuser throat in directly drained CW DF/HF chemical laser
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摘要: 为了研究扩压器喉道长度对直排型连续波DF/HF化学激光器起动特性的影响，建立了一套化学激光器气流通道双喷管小型实验模型。在无二次流的条件下，通过选用喉道长度不同的扩压器进行实验，分别得到对应的起动压力和工作压力，并将起动压力和工作压力的大小作为评价扩压器喉道长度优劣的依据。实验数据显示，对于该特定结构的直排型DF/HF激光器气流通道双喷管实验模型，扩压器喉道最佳长度为等效直径的17倍。Abstract: To study the effect of diffuser throat length on the starting characteristic of the directly drained CW DF/HF chemical laser(DDCL), a double-nozzle small-scale model of the DDCL gas channel was built up. A series of experiments without a secondary flow was conducted with diffusers whose throat lengths were different, and the starting and operating pressures were acquired and considered to be the criterion for judging the length of the diffuser throat. The experimental result indicates that the optimal length of the diffuser throat in the given experimental model is 17 times that of the equivalent diameter.
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