氧碘化学激光器直线分段扩开型扩压器实验研究
Performance of line-divergence subsection supersonic diffuser for COIL
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摘要: 研究了不同几何外形参数对直线分段扩开型氧碘化学激光器(COIL)扩压器性能的影响，实验结果表明：光腔上下壁扩开全角8°时，选取4°超扩段扩散角可获得较好的压力恢复和隔离光腔流场的能力；超扩段增加2 mm竖隔板可降低光腔后部壁面静压，且截止反压提高约12%；在相同腔压下，10°截角唇口的截止反压比直角唇口和1/4圆弧唇口截止反压高出约7.6%；超扩段入口四壁增加人工粗糙带能明显改善光腔壁面静压的分布，并有效提高扩压器效率。Abstract: In chemical lasers, the supersonic diffuser plays an important role in pressure system. This paper introduces some experimental results of line-divergence subsection diffuser for COIL. Preliminary study shows supersonic diffuser with right divergent angel can achieve good ability of pressure recovery and isolated optical cavity fluid field. Diffuser efficiency can be greatly improved by means of setting proper thickness vertical vans along the direction of inner width of diffuser. In addition, optimized shape of labium mouth and manpower roughness in the internal cavity of diffuser entrance can improve wall pressure distribution and diffuser efficiency．
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Key words:
- supersonic diffuser /
- pressure recovery /
- chemical laser /
- clapboard /
- labium mouth
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