It is falsely considered, but widely accepted, that little can now be done to improve the screw compressor process and design. Screw compressors are indeed a mature product today and they form a highly competitive market, especially the oil-flooded air compressor. However, the simultaneous efforts of a large number of manufacturers have resulted in a compact and efficient oil-flooded screw compressor machine. Even small design details now tell the achievement of better compressor efficiency, and there is still some place left for implementation of new methods and procedures that will undoubtedly result in a better final product. New rotor generation procedures, rotor and compressor design optimization for a specified compressor duty and specialized compressor design are innovation elements that are continually improving and developing screw compressors and opening up hitherto unknown ways to produce compressors with better features. Also, the development of a combined compression and expansion machine is reported which could further increase the useful range of application of such machines, especially in refrigeration systems. A review of recent results of computational fluid dynamics (CFD) in screw machines is also given in the paper.
HanjalicK.StosicN.Development and optimization of screw machines with a simulation model. Part II: Thermo-dynamic performance simulation and design. Trans. ASME, J. Fluids Engng, 1997, 119, 664.
22.
StosicN.SmithI. K.KovacevicA.AldisC. A.The design of a twin-screw compressor based on a new profile. J. Engng Des., 1997, 8, 389.
23.
StosicN.MilutinovicL.HanjalicK.KovacevicA.Investigation of the influence of oil injection upon the screw compressor working process. Int. J. Refrig., 1992, 15 (4), 206.
24.
FujiwaraM.OsadaY.Performance analysis of oil injected screw compressors and their application. Int. J. Refrig., 1995, 18, 4.
25.
TangY.FlemingJ. S.Clearances between the rotors of helical screw compressors: Their determination, optimization and thermodynamic consequences. Proc. Instn Mech. Engrs, Part E: J. Process Mechanical Engineering, 1994, 208, 155.
26.
FlemingJ. S.TangY.CookG.The twin helical screw compressor. Part 1: Development, applications and competitive position. Part 2: A mathematical model of the working process. Proc. Instn Mech. Engrs, Part C: J. Mechanical Engineering Science, 1998, 212, 369.
27.
SinghP. J.SchwartzJ. R.Exact analytical representation of screw compressor rotor geometry. International Compressor Engineering Conference at Purdue, 1990, 925.
28.
StosicN.SmithI. K.KovacevicA.VenumadhavK.Retrofit ‘N’ rotors for efficient oil-flooded screw compressors. 15th International Compressor Engineering Conference at Purdue, July 2001.
29.
KovacevicA.StosicN.SmithI. K.Solid-fluid interaction in screw compressors. 16th International Compressor Engineering Conference at Purdue, July 2002.
30.
SaulsJ.An analytical study of the effects of manufacturing on screw rotor profiles and rotor pair clearances. In Proceedings of VDI Tagung Schraubenmaschinen 98, Dortmund, 1998, VDI Berichte 1391.
31.
KauderK.HarlingH. B.Visualisation of oil effects in screw compressors (in German). In Proceedings of VDI Tagung Schraubenmaschinen 94, Dortmund, 1994, VDI Berichte 1135.
32.
VenumadhavK.StosicN.KovacevicA.SmithI. K.The design of a family of screw compressors for oil-flooded operation. International Conference onCompressors and their Systems, London, 2001.
33.
McCreathP.StosicN.KovacevicA.SmithI. K.The design of efficient screw compressors for delivery of dry air. International Conference onCompressors and their Systems, London, 2001.
34.
LitvinF. L.Gear Geometry and Applied Theory, 1994 (Prentice-Hall, Englewood Cliffs, New Jersey).
35.
LysholmA.US Pat. 3,314,598, 1967.
36.
StosicN.HanjalicK.Development and optimization of screw machines with a simulation model. Part I: Profile generation. Trans. ASME, J. Fluids Engng, 1997, 119, 659.
37.
MeyersK.Creating the right environment for compressor bearings, evolution. SKF Ind. J., 1997, 4, 21.
38.
BraszJ. J.ShistlaV.StosicN.SmithI. K.Development of a twin screw expressor as a throttle valve replacement for water-cooled chillers. 15th International Compressor Engineering Conference at Purdue, July 2000.
39.
StosicN.SmithI. K.KovacevicA.Optimization of screw compressor design. 16th International Compressor Engineering Conference at Purdue, July 2002.
40.
StosicN.SmithI. K.KovacevicA.A twin screw combined compressor and expander for CO2 refrigeration system. 16th International Compressor Engineering Conference at Purdue, July 2002.
41.
KovacevicA.StosicN.SmithI. K.Analysis of screw compressor performance by means of 3-dimensional numerical modelling. IMechE Conference onCompressors and their Systems, London, September 2001.
42.
KovacevicA.StosicN.SmithI. K.Influence of rotor deflection upon the screw compressor process. Schraubencom-pressortagung, Dortmund, September 2002.
43.
KovacevicA.StosicN.SmithI. K.Numerical simulation of fluid flow and solid structure in screw compressors. In Proceedings of 2002 ASME Congress, Symposium onAnalysis and Applications of Heat Pump and Refrigeration Systems, New Orleans, Louisiana, 17–22 November, 2002.
