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EFFECT OF BLADE NUMBER AND SPLITTER BLADE POSITION ON THE PERFORMANCE CHARACTERISTIC OF THE COMPRESSOR

The time marching method is used to solve the control equations and a computational analysis of the flow field in a centrifugal compressor with the tip leakage is presented. Emphasis is focused on the effect of the blade number and splitter blade position on the flow and characteristics of the stage. The numerical analysis is carried out using 3-D N-S codes with the B-L algebraic turbulence model for closure. The calculations are performed with a central space discrimination scheme, with second and fourth order artificial dissipation terms. Numerical results show the stage characteristic becomes worse and the load of the blade reduces increasing the blade number. The efficiency is highest when the position of splitter blade is close to PS of the long blade (IBSA).