Simulation and experimental study of high pressure switching expansion reduction considering real gas effect
来源期刊：中南大学学报(英文版)2014年第6期
论文作者：LUO Yu-xi(罗语溪) ZHANG Yan-jun(张彦军) GAO Yu-bao(高玉宝) WANG Xuan-yin(王宣银) XU Zhi-peng(徐志鹏)
文章页码：2253 - 2261
Key words：high pressure pneumatics; pressure reduction; dynamic simulation model; real gas effect
Abstract: Switching expansion reduction (SER) uses a switch valve instead of the throttle valve to realize electronically controlled pressure reduction for high pressure pneumatics. A comprehensive and interactive pneumatic simulation model according to the experimental setup of SER has been built. The mathematical model considers heat exchanges, source air pressure and temperature, environmental temperatures and heat transfer coefficients variations. In addition, the compensation for real gas effect is used in the model building. The comparison between experiments and simulations of SER indicates that, to compensate the real gas effect in high pressure discharging process, the thermal capacity of air supply container in simulation should be less than the actual value. The higher the pressure range, the greater the deviation. Simulated and experimental results are highly consistent within pressure reduction ratios ranging from 1.4 to 20 and output air mass flow rates ranging from 3.5 to 132 g/s, which verifies the high adaptability of SER and the validity of the mathematic model and the compensation method.
LUO Yu-xi(罗语溪)1, ZHANG Yan-jun(张彦军)1,2, GAO Yu-bao(高玉宝)1, WANG Xuan-yin(王宣银)3, XU Zhi-peng(徐志鹏)4
(1. School of Engineering, Sun Yat-sen University, Guangzhou 510006, China;
2. Huawen College, Jinan University, Guangzhou 510610, China;
3. State Key Laboratory of Fluid Power Transmission and Control (Zhejiang University), Hangzhou 310027, China;
4. College of Metrology and Measurement Engineering, China Jiliang University, Hangzhou 310018, China)
Abstract:Switching expansion reduction (SER) uses a switch valve instead of the throttle valve to realize electronically controlled pressure reduction for high pressure pneumatics. A comprehensive and interactive pneumatic simulation model according to the experimental setup of SER has been built. The mathematical model considers heat exchanges, source air pressure and temperature, environmental temperatures and heat transfer coefficients variations. In addition, the compensation for real gas effect is used in the model building. The comparison between experiments and simulations of SER indicates that, to compensate the real gas effect in high pressure discharging process, the thermal capacity of air supply container in simulation should be less than the actual value. The higher the pressure range, the greater the deviation. Simulated and experimental results are highly consistent within pressure reduction ratios ranging from 1.4 to 20 and output air mass flow rates ranging from 3.5 to 132 g/s, which verifies the high adaptability of SER and the validity of the mathematic model and the compensation method.
Key words:high pressure pneumatics; pressure reduction; dynamic simulation model; real gas effect
