Study of diffuser’s start up property in chemical lasers
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摘要: 为实现化学激光器的高速、低压尾气排入背压环境，需开展扩压器的启动特性研究。建立扩压器的仿真分析模型，根据激光器的实际工作需求，进行了扩压器总压11 kPa时的流场仿真，得到了不同背压情况下扩压器启动过程的流场，并提出扩压器逐级启动的工作方式。仿真结果显示，采用逐级启动的工作方式，扩压器以总压13 kPa启动直排入8 kPa的背景，流动稳定后将扩压器总压回调至11 kPa，实现了扩压器的正常启动。依托现有的激光器试车台进行了扩压器逐级启动的试验验证工作。试验结果表明，该种启动方式能够实现扩压器工作能力的提高。Abstract: To discharge the chemical laser’s high-speed and low-pressure gas into the background, the start-up pressure determines the recovery pressure of the diffuser. Base on the laser’s actual requirement, the transient modle of the diffuser is established, and the different background pressure’s flow field is obtained with the total pressure 11 kPa on the diffuser’s inlet. The result shows that the diffuser can’t set up successfully when the background pressure increased to 8 kPa. According to the result, a step setup mode is used, the diffuser start up with total pressure 13 kPa, when the flow field is steady, adjusting the inlet’s total pressure to 11 kPa, the diffuser starts up successfully. Experiment is carried out on the DF laser’s test-bed, the result shows that the diffuser’s ability is advanced.
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Key words:
- chemical laser /
- diffuser /
- start-up /
- total pressure /
- background pressure
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图 1 总压11 kPa扩压器内部马赫云图
Figure 1. Mach number contours of the diffuser with total pressure 11 kPa
图 2 总压13 kPa扩压器内部马赫云图
Figure 2. Mach number contours of the diffuser with total pressure 13 kPa
图 3 逐级启动扩压器内部马赫云图
Figure 3. Mach number contours of the diffuser with step-start diffuser
表 1 扩压器仿真参数
Table 1. Simulation parameters of the diffuser
total pressure/kPa static pressure/kPa total temperature/K background pressure/kPa 11 1.30 1500 8 13 1.54 1500 8 
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表 2 逐级启动扩压器仿真参数
Table 2. Simulation parameters of the step-start diffuser
time/ms total pressure/kPa static pressure/kPa total temperature/K background pressure/kPa 0 13 1.54 1500 8 30 11 1.30 1500 8
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表 3 扩压器试验参数
Table 3. Experiment parameters of diffuser
No. total pressure/kPa static pressure/kPa total temperature/K background pressure/kPa 1 11 1.30 1500 6.9 2 11 1.30 1500 7.2 3 11 1.30 1500 8.0 4 13～11（300 ms） 1.54～1.30（300 ms） 1500 8.0
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