【摘要】 北京大学湍流研究室建成了一座精密的低湍流风洞,该风洞是一座能产生一股速度脉动和温度脉动都非常小的均匀气流的实验设备。技术关键是如何降低气流内的速度脉动值。由于风洞设计上采取了直流,闭口和吸入式的空气动力方案和其他正确技术措施,并精密加工,这样风洞就达到了气流均匀、平稳、湍流度低于0.08％的指标。风洞的实测值是0.05％左右。该风洞除可进行流动的稳定性,湍流发生的机理性基础实验外,还可进行一般的基础应用性实验,如减阻、风载、分离流动等实验研究。同时由于风洞很精密,也可以用作标定各类流速传感器的标准计量风洞。更多还原

【Abstract】 A new low-turbulence wind-tunnel was set up in Turbulence Division of Peking University a Jew year ago. The aerodynamic design of open circuit and induction-type is employed. The size of the test section of the wind-tunnel is 0.8m(height)×0.3m(width)×3.2m(length) and the range of velocity in the test section is from 0.05m/s to 22 m/s. The lowest intensity of turbulence lavel has reached to 0.05％ at the whole range of turbulence frequency. This tunnel has been employed for a few of project on turbulence mechanism, wind-loading and calibration of Anubar flowmeter. All of these experimenral results are excellent.更多还原