基于多重余弦函数的积垢建模及其对叶栅气动性能影响

To simulate the irregular roughness characteristics of a compressor blade surface， a geometric model describing the irregular roughness of a compressor cascade was established based on multiple cosine functions，so as to capture key parameters of compressor blade roughness characteristics. Using a diffuser cascade as the research subject，the effect of different fouling rough structure parameters on the aerodynamic performance of the diffuser cascade was investigated through numerical simulation. The results indicated that cascade fouling led to aerodynamic degradation and increase of flow loss，with the deterioration of aerodynamic performance being more pronounced with higher fouling roughness structure heights，especially at negative incidences. In comparison，the width of the fouling rough structure had a lesser effect on aerodynamic performance degradation. The total pressure loss was more sensitive to fouling than the pressure ratio; for instance，when fouling caused a maximum increase of 145.75% in total pressure loss，the corresponding pressure ratio decreased by only 3.07%.