摘要:
扩压器是高超声速风洞的关键部件,主要作用是提高出口气流的静压。在某高超声速风洞扩压器上布点测量壁面静压和近壁面皮托压力,并在出口布置尖劈测量出口气流参数,评估扩压器的性能。结果表明:扩压器内的核心流区由于存在逐步衰减的激波-膨胀波系,使气流出现“减速-加速-再减速-再加速”的流动过程;该扩压器能保证风洞正常启动以及试验段流场不受背压的影响;该扩压器的效率与国外类似风洞扩压器效率相当,前室总压较低时,扩压器能起到良好的减速增压的效果,前室总压较高时,扩压器增压效果不明显,扩压器出口气流马赫数偏高。
关键词:
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高超声速风洞 /
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扩压器 /
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压力 /
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马赫数
Abstract:
Diffuser is the critical part of the hypersonic wind tunnel,The mainly role of the diffuser is to increase the static pressure at the diffuser exit.The wall static pressures and near-wall total pressure pressures along the diffuser are measured,and a measurement rake is installed to measure the flow parameters at the exit of diffuser and evaluate the internal flow performance of the diffuser.The results indicate that the phenomenon of“speed slow-up-slow-up”in inflow of the diffuser appears,the existing diffuser can ensure normal start of the wind tunnel and isolate the test section from disturbance of back pressure;the efficiency of the diffuser is correspond to the similar ones of foreign countries.If the stilling chamber pressure is lower,the diffuser has better effect of reducing speed and boosting pressure;conversely,the effect is not well,the Mach number at the exit is higher.
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