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Performance analysis of a two-stage expansion air engine

Author

Listed:
  • Liu, Chi-Min
  • Huang, Chin-Lun
  • Sung, Cheng-Kuo
  • Huang, Chih-Yung

Abstract

This study proposes an air engine consisting of one small and one large cylinder to conduct two-stage expansion in series, in which high-pressure air first expands in the small cylinder and then residual-pressure air is transferred to the large cylinder for another expansion, by fully using the high-pressure air and increasing the power output and efficiency of the engine. First, mathematical models of a single-cylinder engine and a two-stage expansion engine were constructed. Second, the relations between the rotational speed and the output power, torque, efficiency, and cylinder pressure were established using MATLAB simulation software for analyzing the air engine in comparison with experimental approaches. The experimental results indicated that the two-stage expansion engine generated up to 1.7 kW of power and 12.42 Nm of torque at air pressure of 12 bar, which was superior to the performance of a single-cylinder engine. By varying the intake and exhaust timing sequences, the relations among the rotational speed, output power, torque, efficiency, and cylinder pressure were investigated. The results showed that early intake in the first cylinder improved power output by 5.3% as the speed increased, whereas early intake and exhaust in the second cylinder increased power output by 7%.

Suggested Citation

  • Liu, Chi-Min & Huang, Chin-Lun & Sung, Cheng-Kuo & Huang, Chih-Yung, 2016. "Performance analysis of a two-stage expansion air engine," Energy, Elsevier, vol. 115(P1), pages 140-148.
  • Handle: RePEc:eee:energy:v:115:y:2016:i:p1:p:140-148
    DOI: 10.1016/j.energy.2016.09.023
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    References listed on IDEAS

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    1. Foley, A. & Díaz Lobera, I., 2013. "Impacts of compressed air energy storage plant on an electricity market with a large renewable energy portfolio," Energy, Elsevier, vol. 57(C), pages 85-94.
    2. Liu, Chi-Min & You, Jhih-Jie & Sung, Cheng-Kuo & Huang, Chih-Yung, 2015. "Modified intake and exhaust system for piston-type compressed air engines," Energy, Elsevier, vol. 90(P1), pages 516-524.
    3. Chih-Yung Huang & Cheng-Kang Hu & Chih-Jie Yu & Cheng-Kuo Sung, 2013. "Experimental Investigation on the Performance of a Compressed-Air Driven Piston Engine," Energies, MDPI, vol. 6(3), pages 1-15, March.
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    5. Brown, T.L. & Atluri, V.P. & Schmiedeler, J.P., 2014. "A low-cost hybrid drivetrain concept based on compressed air energy storage," Applied Energy, Elsevier, vol. 134(C), pages 477-489.
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    Cited by:

    1. Qihui Yu & Xiaodong Li & Zhigang Wei & Guoxin Sun & Xin Tan, 2022. "Study on Performance of a Modified Two-Stage Piston Expander Based on Spray Heat Transfer," Sustainability, MDPI, vol. 14(19), pages 1-20, October.

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