### Compensation of Pressure Enthalpy Effects on Temperature Fields for Throttling of High-Pressure Real Gas

LUO Yuxi1* (罗语溪), LIANG Jiuxing1 (梁九兴), WANG Xuanyin2 (王宣银), XU Zhipeng3 (徐志鹏)

1. (1. School of Engineering, Sun Yat-sen University, Guangzhou 510006, China; 2. State Key Laboratory of Fluid Power Transmission and Control, Zhejiang University, Hangzhou 310027, China; 3. College of Metrology and Measurement Engineering, China Jiliang University, Hangzhou 310018, China)
2. (1. School of Engineering, Sun Yat-sen University, Guangzhou 510006, China; 2. State Key Laboratory of Fluid Power Transmission and Control, Zhejiang University, Hangzhou 310027, China; 3. College of Metrology and Measurement Engineering, China Jiliang University, Hangzhou 310018, China)
• Online:2017-03-31 Published:2017-04-04
• Contact: LUO Yuxi (罗语溪) E-mail:luoyuc@163.com

Abstract: For the pressure enthalpy of high pressure pneumatics, the computational fluid dynamics (CFD) simulation based on ideal gas assumption fails to obtain the real temperature information. Therefore, we propose a method to compensate the pressure enthalpy of throttling for CFD simulation based on ideal gas assumption. Firstly, the pressure enthalpy is calculated for the pressure range of 0.101 to 30 MPa and the temperature range of 190 to 298 K based on Soave-Redlich-Kwong (S-R-K) equation. Then, a polynomial fitting equation is applied to practical application in the above mentioned range. The basic idea of the compensation method is to convert the pressure enthalpy difference between inlet air and nodes into the compensation temperature. In the above temperature and pressure range, the compensated temperature is close to the real one, and the relative temperature drop error is below 10%. This error is mainly caused by the velocity difference of the orifice between the real and ideal gas models. Finally, this compensation method performs an icing analysis for practical high pressure slide pilot valve.

Key words: real gas effect| pressure enthalpy| temperature field| throttling| computational fluid dynamics (CFD)| Soave-Redlich-Kwong (S-R-K) equation

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