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Real gas effects on charging and discharging processes of high pressure pneumatics

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Abstract

The high pressure pneumatic system has been applied to special industries. It may cause errors when we analyze high pressure pneumatics under ideal gas assumption. However, the real gas effect on the performances of high pressure pneumatics is seldom investigated. In this paper, the real gas effects on air enthalpy and internal energy are estimated firstly to study the real gas effect on the energy conversion. Under ideal gas assumption, enthalpy and internal energy are solely related to air temperature. The estimation result indicates that the pressure enthalpy and pressure internal energy of real pneumatic air obviously decrease the values of enthalpy and internal energy for high pressure pneumatics, and the values of pressure enthalpy and pressure internal energy are close. Based on the relationship among pressure, enthalpy and internal energy, the real gas effects on charging and discharging processes of high pressure pneumatics are estimated, which indicates that the real gas effect accelerates the temperature and pressure decreasing rates during discharging process, and decelerates their increasing rates during charging process. According to the above analysis, and for the inconvenience in building the simulation model for real gas and the difficulty of measuring the detail thermal capacities of pneumatics, a method to compensate the real gas effect under ideal gas assumption is proposed by modulating the thermal capacity of the pneumatic container in simulation. The experiments of switching expansion reduction (SER) for high pressure pneumatics are used to verify this compensating method. SER includes the discharging process of supply tanks and the charging process of expansion tank. The simulated and experimental results of SER are highly consistent. The proposed compensation method provides a convenient way to obtain more realistic simulation results for high pressure pneumatics.

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Authors and Affiliations

  1. The State Key Lab of Fluid Power Transmission and Control, Zhejiang University, Hangzhou, 310027, China

    Yuxi Luo, Xuanyin Wang & Yaozheng Ge

  2. School of Engineering, Sun Yat-sen University, Guangzhou, 510006, China

    Yuxi Luo

Authors
  1. Yuxi Luo
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  2. Xuanyin Wang
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  3. Yaozheng Ge
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Corresponding author

Correspondence to Yuxi Luo.

Additional information

This project is supported by National Natural Science Foundation of China (Grant No. 50575202)

LUO Yuxi, born in 1983, is currently a lecturer at School of Engineering, Sun Yat-sen University, China. He received his PhD degree from The State Key Lab of Fluid Power Transmission and Control, Zhejiang University, China, in 2011. His current research interests include high-pressure pneumatic system and medical instruments and equipment.

WANG Xuanyin is currently a professor and a doctor supervisor at The State Key Lab of Fluid Power Transmission and Control, Zhejiang University, China. He received his PhD degree from Harbin Institute of Technology, China, in 1995. His research interests include fluid power transmission and control, intelligent machine and image information, etc

GE Yaozheng works at The State Key Lab of Fluid Power Transmission and Control, Zhejiang University, China. He obtained his M.S. degree from Zhejiang University, China, in 2005. His research interests are mechatronics system and control engineering.

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Luo, Y., Wang, X. & Ge, Y. Real gas effects on charging and discharging processes of high pressure pneumatics. Chin. J. Mech. Eng. 26, 61–68 (2013). https://doi.org/10.3901/CJME.2013.01.061

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  • DOI: https://doi.org/10.3901/CJME.2013.01.061

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