This paper deals with the numerical investigations on the effect of mean camber line casing treatment slot on the performance of a NACA transonic axial compressor stage. From the literature review on it is revealed that in transonic compressor tip leakage flow interacts with end wall boundary layer, core flow and shock waves. To improve the flow in tip region researchers started using casing treatments. Casing treatments consists of slots, grooves or cavities on rotor casing, and recirculation

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... ype. From experimental and numerical studies it is found that casing treatment improves stall margin. Effect of casing treatment on axial compressor rotor tip region has shown some positive results in improving the stall margin and hence increasing engine operating range. Different type of casing treatments are employed on different axial compressor rotor/stage geometries. Investigation of axial compressor stall control by casing treatment can be done with less difficulty either by experiment or numerical computation. Because of easy design and some extent of assured positive results, casing treatment has attracted axial compressor researchers to pursue continuous investigative studies till date. . The mean camber line casing treatment has shown positive results in improving stall margin to still lower mass flow rate. Total pressure ratio with casing treatment was less than base line. Parametric studies were carried out varying slot height from 11mm and 4mm for constant number of 181 slots.