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测定一个下吹、暂冲式三音速风洞的跨音速试验段流场M数分布和侧壁边界层特性。该试验段上下壁面开槽,截面尺寸为535×375mm。测定的试验M数范围为0.2～1.15。M=1.0时每米Re数为10×10~6。取国内规定的流场不均匀度ε_M作标准,所测各点未出现|ΔM_(max)|≥2ε_M情况。侧壁边界层的平均速度、湍流度和湍流应力分布的规律性良好,表明侧壁面可用作边界层实验。所测得的湍流度分布结果可作为今后制订跨音速风洞湍流度指标参考。
The flow field M-number distribution and sidewall boundary layer properties of a subsonic and transient three-wind wind tunnel were measured. The upper and lower wall of the test section slotted, cross-sectional size of 535 × 375mm. The measured M number ranged from 0.2 to 1.15. When M = 1.0, the number of Re is 10 × 10 ~ 6. Take domestic provisions of the flow field non-uniformity ε_M as a standard, the measured points did not appear | ΔM_ (max) | ≥ 2ε_M situation. The regularity of the average velocity, turbulence and turbulent stress distribution in the sidewall boundary layer is good, which shows that the sidewall surface can be used as the boundary layer experiment. The measured turbulence distribution can be used as a reference for the future development of transonic wind tunnel turbulence index.