Journal of Shandong University(Engineering Science) ›› 2021, Vol. 51 ›› Issue (4): 84-90.doi: 10.6040/j.issn.1672-3961.0.2020.267

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Operating characteristics of oil-free twin-screw air compressor

LI Peng1,2, LIU Zhaoqiang1, YANG Fengling2,3*, LIU Xin2   

  1. 1. Tengzhou Cigarette Factory, China Tobacco Shandong Industrial Co., Ltd., Tengzhou 277599, Shandong, China;
    2. School of Mechanical Engineering, Shandong University, Jinan 250061, Shandong, China;
    3. Key Laboratory of High-Efficiency and Clean Mechanical Manufacture of Ministry of Education(Shandong University), Jinan 250061, Shandong, China
  • Published:2021-08-18

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Abstract: In order to improve the operating efficiency of the oil-free twin-screw air compressor, the operating characteristics of the compressor were studied. Polytropic exponent, optimal intermediate pressure, exhausted-air pressure and temperature of the oil-free twin-screw air compressor during the operating processes were systematically studied. The theoretical analyses and experimental measurements were carried out. Results showed that the first-stage compression polytropic index was slightly lower than the second stage, both were higher than the iso-entropy exponent. With the increase of motor load rate, they firstly decreased gradually and then tended to be stabilized. If the intermediate cooler were taken into account, the first-stage compression polytropic index was slightly higher than the second stage. Both were lower than the iso-entropy exponent and increased slightly with the increase in the motor load rate. The optimal intermediate pressure of the oil-free twin-screw air compressor was quite complex, and it could not be simply considered as square root of the product of the compressed and the initial pressure. With the increase in motor load rate, the first-stage compression exhausted-air temperature gradually decreased, the second-stage compression exhausted-air temperature gradually increased, the first-stage exhausted-air pressure slightly decreased and the second-stage exhausted-air pressure slightly increased. Results of this work laid the foundation for better design and use of the oil-free twin-screw air compressor.

Key words: oil-free twin-screw air compressor, polytropic exponent, intermediate pressure, entropy, thermodynamics

CLC Number: 

  • TH138.21
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