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采用数值和实验相结合的方法,对3/4开口回流式风洞驻室内的速度脉动进行了研究。首先搭建了1∶15的模型风洞驻室的数值模型。对此模型风洞驻室内的流场采用非定常的雷诺时均方法进行了数值模拟。入口边界速度条件由不变的平均速度量和带有周期性扰动的速度变量线性组合构成,其中计算了扰动量具有不同频率和平均速度设为不同常量的工况。同时在此模型风洞内对驻室内流场进行了相应工况的实验测试,实验和计算结果吻合度很好,得到结论是非定常流态在风洞驻室内随流动的发展而发展,并且引起了频率为20Hz的扰动。
The method of numerical and experimental methods was used to study the velocity pulsation in a 3/4 open-circuit wind tunnel. First, a 1:15 model wind tunnel in the numerical model. The flow field in the model wind tunnel is numerically simulated by unsteady Reynolds averaged method. The inlet boundary velocity conditions consist of a linear combination of invariant mean velocities and velocity variables with periodic perturbations, where operating conditions with different frequencies and average velocities for the disturbance are set to different constants. At the same time, experimental test of the flow field in the model is carried out in the model wind tunnel. The agreement between the experiment and the calculation is very good. It is concluded that the unsteady flow develops along with the flow in the chamber of the wind tunnel and causes The frequency of 20Hz disturbance.