An Improved Analytic Model to Predict Fouling Phenomena in the Axial Compressor of Gas Turbine Engines

초록

he gas turbine performance is deteriorated with increased operating hours. Fouling in the axial compressor is one of important factors for the performance degradation of gas turbine. Airborne particles entering with air into compressor adhere to the blade surface and result in the change of the blade shape, which directly influence the compressor performance. It is difficult to exactly understand the mechanism of compressor fouling because of its slowly growing process and different length scale of dimensions of compressor blades. In this study, as an approach to investigate physical phenomena of the fouling in gas turbine compressors, an improved analytic method to predict the particle motion in axialcompressor and the characteristics of particle deposition onto blade is proposed. Calculated results using the proposed method and comparison with measured data demonstrate the feasibility of the model. It is also found that design parameters of axial compressor such as chord length, solidity and number of stages are closely related to the fouling phenomena. And, the particle size and pat-terns of particle distributions are also important factors related to the fouling phenomena in the axial compressor of gas turbine engines.