1Assistant Professor, G. Narayanamma Institute of Technology and Sciences, Shaikpet, Hyderabad, India
2Professor, J. N. T. U.A, College of Engineering, Anantapur, A. P, India
3Professor & Principal, Department of Mechanical Engineering Intell Engineering College, Anantapur, A.P, India
4Professor & Principal, Department of Mechanical Engineering SKD Engineering College, Gooty, A.P, India
Online published on 31 October, 2017.
Computational analyses of flow field in a centrifugal compressor with partial shroud on tip of the blade are presented in this paper. A low speed centrifugal compressor with three tip clearances i.e., τ = 2.2%, 5.1% and 7.9% of blade height at trailing edge are examined at four flow coefficients φ = 0.12, 0.18, 0.28 and 0.34. Analysis is carried out for two different cases, one without partial shroud on the tip of the blade and second with partial shroud on the tip of the blade. The two cases are studied at four different flow coefficients using ANSYS-CFX. Pressure ratio improvement with partial shroud on tip of the blade is observed. The leakage of flow over tip of the blade through the partial shroud from pressure side to suction side of the blade is interacting with passage wake near shroud and reduction in passage wake region area is observed with partial shroud on tip of the blade. Increase in the velocity of the fluid in passage wake is also observed with partial shroud on tip of the blade. For partial shroud on tip of the blade also, increase of velocity in passage wake is observed but reduction in pressure ratio is observed due to more leakage flow.
Centrifugal Compressor, Flow coefficient, partial shroud on tip of the blade, passage wake
