STUDYTHE EFFECTSOF TIPLEAKAGEFLOWSONPERFORMANCE OF AXIAL FLOW ROTOR

Abstract

The presentresearchaims to study the effectsof tip leakage flowphenomena on the performance of the axial flow rotor. Tounderstandthe effectof this phenomena,three different tipclearance sizes, 0, 4, and6mmat different rotation speedsstudies. The understand includesinvestigation of detailed tip clearance flow structures and representation of different flow parameters at different regions inside the rotor.The steady, viscous, compressible flow three dimensional governing equations representing the flow field coupled with standardK turbulence model are solved usingcomputational fluiddynamic code. Theanalysis of the results shows, the rotor blade withzero gap has higher efficiency and higher total pressure.Increasing tip clearance, leads to decrease of bothefficiency and total pressure. Also the result show the increase of tip clearance from 4mm, to 6mm strong vortex formed for tip 6mm than that for tip4mm.Also the rotation speed has great influence on the tip leakage flow and vortex.A comparison between the predicted results and available literature results indicates that the different phenomena inside the tip region and their effects are properly predicted.