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International Journal of Rotating Machinery
Volume 7, Issue 1, Pages 65-78

Numerical Simulation and Performance Analysis of Twin Screw Air Compressors

1Department of Air Conditioning and Refrigeration, National Taipei University of Technology, Taipei 106, Taiwan
2Department of Mechanical Engineering, National Taiwan University, Taipei 106, Taiwan
3Fu Sheng Industrial Co. Ltd., No. 60, Sec. 2, Kwang-Fu Rd., Sanchung 241, Taiwan

Received 15 October 1998; Revised 6 August 1999

Copyright © 2001 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


A theoretical model is proposed in this paper in order to study the performance of oil-less and oil-injected twin screw air compressors. Based on this model, a computer simulation program is developed and the effects of different design parameters including rotor profile, geometric clearance, oil-injected angle, oil temperature, oil flow rate, built-in volume ratio and other operation conditions on the performance of twin screw air compressors are investigated. The simulation program gives us output variables such as specific power, compression ratio, compression efficiency, volumetric efficiency, and discharge temperature. Some of the above results are then compared with experimentally measured data and good agreement is found between the simulation results and the measured data.