砂尘环境试验风洞压力特性及控制策略

Pressure characteristics and control method of wind tunnel for sand and dust test

砂尘环境试验风洞的压力调节方式不同于常规回流式风洞,为了研究风洞中压力变化的动态特性,进行合理分析与简化后,应用集总参数法建立起风洞压力控制点、试验段及加砂段压力变化的动态特性模型,给出了相应的控制策略.通过仿真试验得出不同扰动因素对压力分布的影响规律,在此基础上对砂尘环境试验风洞的压力控制系统进行了仿真研究.能够有效优化风洞结构、提高承压能力及确定各部件控制精度.

Pressure adjustment of wind tunnel for sand and dust test is different from general circumfluent one. In order to determine characteristics of pressure variation, dynamic model for controlling-pressure point, testing port and injecting-sand-and-dust port was established, by the means of lumped parameter method (LPM) with physical analysis and simplification. Control method was offered according to the model. The rule that different disturbance effects on pressure distribution was observed, and control system of wind tunnel for sand and dust test was studied by the means of simulation. The results are satisfied. This work is important to optimize the configuration of the wind tunnel and to enhance its ability of sustaining pressure and is significant to ascertain the control precision for each component of the wind tunnel.