Investigation On Twin Screw Compressor Rotor Profile

The screw compressor is a favorable rotating displacement compressor with a screw-shaped piston. The primary components are male and female rotors that move towards each other while the volume between them and the housing reduces. In an industry, the compressors are one of the highest power consuming machines. Hence, to decrease the power consumption, the efficiencies of these machines need to be at the highest level at all operating conditions. There are different geometric and installation parameters of the screw compressor that influence screw compressor efficiency such as inlet and outlet ports, rotor size, lobe mixture, rotor length to diameter ratio, clearance and primarily rotor profile. There are very limited or no literature available with open access for the design of a screw rotor profile. This paper focuses on the initial steps to be followed during the design of screw rotor profile. Various curves have been used to generate rotor profile. The curve used in a particular area of the main profile is the sine curve. The study presents profile generation using above mentioned curve. An analysis and comparison of the performances of this profile with widely used profile in the commercial market. Profile used here for comparison is �N� profile developed by City, University of London, UK

REFERENCES

[1] K. Hanjalic, N. Stosic, "General Method for Screw Compressor Profile Generation," in International Compressor Engineering Conference, 1996)
[2] S. Nikola, I. K. Smith, A. Kovacevic, K Venu Madhav, "The Design of a Family of Screw Compressors for Oil�Flooded Operation," City, pp. 22-45, 2001.
[3] I. K. Smith, K. Ahmed. S.Nikola, "Optimisation of screw compressors," Applied Thermal Engineering, pp. 1177-1195, 2003
[4] X. He, "Rotor Profile Generation Method for Twin Screw Compressors Based on Bi- Direction," Applied Mechanics and Materials , vol. 2, pp. 465-469, 2012.
[5] Y. Wu, Z. H. Fong, " Rotor Profile Design for the Twin-Screw Compressor Based on the Normal-Rack Generation Method," Journal of Mechanical Design, April 2008.
[6] K. Ahmed, S. Ian, Elvedin Mujic, S. Nikola, "Geometry of screw compressor rotors and their tools," Journal of Zhejiang University - Science A: Applied Physics & Engineering, April 2011.
[7] K. Kanthavel, R. Mythili, P. J. Xavier, "Rotor Profile Design for Twin Screw Compressor," International Journal of Scientific & Engineering Research, vol. 2, no. 7, 2011.
[8] Y. Wu, Zi-An Chen, R. Hsu, "A Numerical Method for Reversely Generating a Pair of Conjugated Rotor Profiles of Twin-screw Compressor from the Measured Profile Data," in CIRP Conference on Manufacturing Systems, 2017.
[9] S. Nikola, "On gearing of helical screw compressor rotors," Journal of mechanical engineering science, pp. 587-594, 1998.
[10] R. K. Sahoo, S. K. Sarangi, N. Seshaiah, "Theoretical and experimental studies on oil injected twin-screw air compressor when compressing different light and heavy gases," Applied Thermal Engineering, pp. 327-339, 2010.
[11] M Arjeneh, K. Ahmed, R. Sham, "Numerical and Experimental Investigation of Pressure Losses at Suction of a Twin Screw Compressor," Materials Science and Engineering, pp. 90-94, 2015.
[12] Feng Hou, Zhaorui Zhao Yu, Ziwen Xing, "Experimental study of the axial force on the rotors in a twin-screw refrigeration compressor," International Journal of Refrigeration, pp. 155-163, 2017.
[13] M Pascu, M. Heiyanthuduwage, S Mounoury, G Cook," Influence of the suction arrangement and geometry of the inlet port on the performance of twin screw compressors," in 8th International Conference on Compressors and their Systems, Howden,UK, 2013
[14] D. Buckney, K. Ahmed,S. Nikola, "Consideration of clearances in the design of screw compressor rotors," in 7th- International Conference on Compressors and Their Systems, 2011.
[15] S. Nikola, "On heat transfer in screw compressors," International Journal of Heat and Fluid Flow, pp. 285-297, 2015.
[16] M. A. Mounoury, S. K. Ahmed, Heiyanthuduwage, "Performance prediction methods for screw compressors," in Institution of Mechanical Engineers -7th International Conference on Compressors and their Systems, 2011.
[17] W. E. Forthoffer, �Screw Compressor� Rotating equipment: Compressor, First ed, Park Avenue, New York Elsevier publication, 2005, pp 371-392,
[18] N. stosic, I. Smith ,A. KovaceviScrew �Calculation of Screw Compressor Performance,� in Compressors Mathematical modelling and performance calculation. Netherland,2005,pp-49-84
[19] A.P.Boresi, �Contact Stress,� in Advance Mechanics of Materials, sixth ed. River Street, Hoboken, USA: John Wiley & Sons, Inc,2003, pp.522-619
[20] A.P.Boresi, �Theories of stress and strain,� in Advance Mechanics of Materials and Applied Elasticity, sixth ed. River Street, Hoboken, USA: John Wiley & Sons, Inc,2003, pp.26-70
[21] A.C.Ugural, �Problems in elasticity,� in Advance Mechanics of Materials, sixth ed. Massachusetts, USA: Prentice Hall,2012, pp.124-167