Study on recovery pressure of diffuser for DF chemical laser
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摘要: 在化学激光器的研制中,扩压器压力恢复的研究具有重要的工程应用价值,通过数值模拟结合试验的方式对氟化氘(DF)化学激光器的扩压器进行展开研究,主要针对扩压器的扩张角、结构类型等参数对扩压器性能的影响进行计算分析并进行试验验证。研究结果表明:平直段+8°扩张角的扩压器,抵抗高背压的能力较弱,通过减小扩张角至5°可以有效提高抵抗背压的能力;进一步优化后的超声速二次喉道扩压器能够再次提高扩压器的恢复压力,减小气流的能量损失,提高抗反压特性。针对不同模型的扩压器进行了实验验证,实验结果与数值模拟的结果趋势较一致。Abstract: In development of high-energy chemical laser, the research of diffuser pressure recovery has important engineering application value. In this paper, the diffuser of DF chemical laser is studied by numerical simulation and experiment. The effects of diffuser divergence angle and secondary-throat on diffuser performance are calculated, analyzed and verified by experiments. The results show that the diffuser with 8° divergence angle has weak ability to resist back pressure, and reducing the divergence angle to 5° can effectively improve the ability to resist back pressure. The further optimized supersonic diffuser with secondary-throat can increase the recovery pressure of the diffuser again, reduce the energy loss of the air flow and improve the anti-back pressure characterisitics. At the same time, experimental verification is carried out for different models of diffusers, and the result is consistent with the trend of numerical simulation results.
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Key words:
- pressure recovery /
- diffuser /
- divergence angle /
- secondary-throat /
- chemical laser
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表 1 8°扩张角的扩压器静压分布
Table 1. Static pressure distribution along the length of diffuser with 8° expansion
x/mm static pressure under 23.34 kPa back pressure/kPa static pressure under 24.53 kPa back pressure/kPa 25 7.08 10.71 250 8.59 16.25 500 18.88 19.05 750 19.15 20.03 1200 19.15 21.64 1800 23.24 23.8 表 2 5°扩张角的扩压器静压分布
Table 2. Static pressure distribution along the length of diffuser with 5° expansion
x/mm static pressure under 23.34 kPa back pressure/kPa static pressure under 26.67 kPa back pressure/kPa 25 7.07 7.07 250 7.93 12.03 500 8.53 18.13 750 10.2 20.76 1200 16.36 21.77 1800 19.56 24.29 2200 21.99 25.87 2500 22.85 26.64 表 3 背压试验
Table 3. Back pressure tests
back pressure/kPa pressure of laser cavity/kPa x=24 mm x=98 mm x=138 mm 1.36 4.17 5.75 7.01 13.19 4.04 5.33 6.65 17.08 4.03 5.6 7 20.63 4.13 5.71 6.96 21.8 4 5.48 6.72 -
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