The change of the blade shape will result in the performance degradation of compressor.Traditionally

the calculation of the compressor performance degradation is accomplished by assuming that the blade surface varies evenly

or the loss coefficient is introduced into the model

which often produces error.The paper simulated the change of the blade shape caused by fouling using the method of adding random size in the fouling position.Meanwhile

the effect of the ingredients of the blade foul and tip clearance increase on the compressor performance was analyzed.The quantitative performance degradation at different work conditions

and the change of the air float field and the total temperature around the blade surface were gained.The results offer theoretical and applicative value for the research of the engine performance degradation and fault analysis.