高速风洞喷流控制系统设计与实现

为了提高控制精度和调节速度,喷流控制系统采用由电磁阀和文氏喷管组成的数字阀作为调节阀,并针对数字阀的调节脉动和启动气流冲击等问题,设计了增量式PID、控制延时与线性预开度相结合的控制方法:增量式PID控制安全可靠,误动作影响小;控制延时使电磁阀的开关时间相匹配,抑制了电磁阀切换导致的气流脉动;线性预开度解决了数字阀突然启动造成的气流冲击力过大的问题.调试结果表明,喷流控制系统稳定可靠,控制精度和调节速度满足试验需求.

Design and Implementation of Jet Flow Control System for High-Speed Wind Tunnel

In order to improve the control precision and the rate of regulation,digital valve composed of solenoid valve and Venturi nozzle is used as regulating valve for the jet flow control system.In order to solve the problems such as excessive flow impact and regulation oscillating of digital valve,a control method based on incremental PID,linear pre-opening and time-delay control is designed.Incremental PID control is safe and reliable,and the influence of malfunction is small.Time-delay control matches the switching time of solenoid valve,which restrains the pulsation of regulation.The linear pre-opening weakens the impact force of air flow caused by digital valve snap start.The results show that the jet flow control system is stable and reliable,the control precision and the rate of regulation meet the requirements of jet test.