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Study of polytropic exponent based on high pressure switching expansion reduction

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Abstract

Switching expansion reduction (SER) uses a switch valve to substitute the throttle valve to reduce pressure for high pressure pneumatics. The experiments indicate that the simulation model well predicts the actual characteristics. The heat transfers and polytropic exponents of the air in expansion tank and supply tanks of SER have been studied on the basis of the experiments and the simulation model. Through the mathematical reasoning in this paper, the polytropic exponent can be calculated by the air mass, heat, and work exchanges of the pneumatic container. For the air in a constant volume tank, when the heat-absorption is large enough to raise air temperature in discharging process, the polytropic exponent is less than 1; when the air is experiencing a discharging and heat-releasing process, the polytropic exponent exceeds the specific heat ratio (the value of 1.4).

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Authors and Affiliations

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

    Xuanyin Wang, Yuxi Luo & Zhipeng Xu

  2. College of Metrology and Measurement Engineering, China Jiliang University, Hangzhou, 310018, China

    Zhipeng Xu

Authors
  1. Xuanyin Wang
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  2. Yuxi Luo
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  3. Zhipeng Xu
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Additional information

This research is supported by the National Natural Science Foundation of China (No.50575202).

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Wang, X., Luo, Y. & Xu, Z. Study of polytropic exponent based on high pressure switching expansion reduction. J. Therm. Sci. 20, 435–441 (2011). https://doi.org/10.1007/s11630-011-0492-3

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  • DOI: https://doi.org/10.1007/s11630-011-0492-3

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