摘要
针对传统的模拟调节阀和数字阀存在的不足,在FL-12风洞设计了一种流量精确控制的高压供气系统。首先通过ER5000控制器和先导比例阀驱动多台薄膜式减压阀实现气流压力的初步调节;然后在此基础上,采用基于PCM数字阀和等百分比流量特性的针型阀共同实现气体流量的精确控制;其次采用带蜂窝器和阻尼网的临界流文丘里流量计进行气流的精确测量;最后,提出基于非线性自整定PID的流量控制算法。试验结果表明,该供气系统的流量调节范围为0.1~8 kg/s,流量控制的绝对精度为±3 g/s,相对控制精度为0.04%,动态调节性能优异,可为风洞进气道等试验提供重要保障。
In consideration of the flaws about traditional analog control valve and digital valve,a high pressure air supply system with accurate flow control is designed.Firstly,the ER5000 controller and pilot valve drive several diaphragm reducing valves to achieve the coarse tuning of air pressure;Secondly,the PCM digital valve and needle valve with equal percentage flow characteristics complete precise adjustment.Then,the critical flow venture meter with honeycomb and damping net is used to accurately measure the mass flow.Finally,a flow control strategy based on nonlinear self-tuning PID is proposed.The results show that the flow regulation range is O.1~8 kg/s,the absolute accuracy is±3 g/s,the relative accuracy is±0.04%,and the dynamic adjustment performance is excellent,which can provide important support for wind tunnel inlet test.
作者
康洪铭
陈辅政
宋晋
唐领
KANG Hong-ming;CHEN Fu-zheng;SONG Jin;TANG Ling(China Aerodynamics Research and Development Center,Mianyang,Sichuan 621000)
出处
《液压与气动》
北大核心
2023年第10期169-174,共6页
Chinese Hydraulics & Pneumatics
关键词
供气系统
数字阀
针型阀
流量控制
air supply system
digital valve
needle valve
flow regulation
