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现以ЦАГИ某风洞为例,介绍其物理试验研究方法。风洞概况这是一个连续式变密度亚跨音速风洞。圆形闭口试验段截面直径2.48米,长度4.85米。马赫数0.1～1.1,最大速压6000千克/米~2,试验段压力0.5～5大气压,阻滞温度287°～333°K,初始紊流度0.3％～0.8％,压力脉动0.5％,总压流场不均匀系数0.995,静压流场不均匀系数0,洞壁固定开闭比15％。试验段未扰动气流参数在检验截面测取,该截面距天平轴原点1350毫米。模型迎角机构可使迎角变化范围达到-10°～+33°。模型安装时利
Now ЦАГИ a wind tunnel as an example, introduce its physical experimental research methods. Wind Tunnel Overview This is a continuous variable density subsonic wind tunnel. Round closed test section section diameter of 2.48 meters, length 4.85 meters. Mach number 0.1 ~ 1.1, the maximum speed of 6000 kg / m ~ 2, the experimental section pressure of 0.5 to 5 atmospheres, the blocking temperature of 287 ° ~ 333 ° K, the initial turbulence of 0.3% to 0.8%, pressure pulsation 0.5% The non-uniform coefficient of pressure flow field is 0.995, the non-uniform coefficient of hydrostatic flow field is 0, and the opening and closing ratio of hole wall is 15%. The undisturbed airflow parameters of the test section were taken at the test section, which is 1350 mm from the origin of the balance axis. Model angle of attack mechanism can make the angle of attack range of -10 ° ~ +33 °. Model installed when Lee