Tip Leakage Effects on Flow Field of a Centrifugal Compressor
Journal Title: International Journal of Mechanical and Production Engineering Research and Development (IJMPERD ) - Year 2017, Vol 7, Issue 4
Abstract
Tip leakage effects on the flow field of a low speed centrifugal compressor is observed computationally using structured multi block grid with fine grid in the tip leakage region. The computational study of centrifugal compressor is carried out without and with a partial shroud on the tip of the blade with finite volume method upwind scheme using ANSYS CFX software. Centrifugal compressor impeller with three values of tip clearances i.e., τ = 2.2%, 5.1% and 7.9% of blade height at trailing edge are examined at four flow coefficients 0.12, 0.18,0.28 and 0.34. The effect of tip clearance on total pressure coefficient and static pressure coefficient from inlet to outlet of the compressor is observed. The drop in static pressure coefficient and total pressure coefficient with the increase in tip clearance is found to be high at the tip of the blade due to high pressure fluid leakage at the tip of the blade. Shifting on the maximum value of non-dimensional tangential velocity towards the hub at the outlet of impeller to increase in clearance is analyzed. The velocity vectors at turbo surface 1.8, velocity contours are analyzed and tangential velocity graphs are plotted.
Authors and Affiliations
S. M. Swamy, V. Pandurangadu, R. Rama Chandra, V. Naga Prasad Naidu
Keywords
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