常用湍流模型对某低速轴流压气机转子叶尖泄漏流的预测研究

Predictive Study on Commonly Used Turbulence Models for Rotor Blade Tip Leakage Flow in a Low Speed Axial Compressor

为了研究常用湍流模型对轴流压气机转子叶尖泄漏流的预测能力,对某低速轴流压气机进行了实验研究及数值模拟,对比分析了不同湍流模型预测的转子叶尖泄漏流的流场分布、旋涡特性以及堵塞特性与实验结果的异同。结果表明:对于转子叶尖泄漏流的旋涡特性,在近失速点,k-ω模型预测的转子叶尖泄漏涡轨迹的斜率和位置在周向上的分布以及泄漏涡涡核的面积与实验结果最接近;对于转子叶尖泄漏流堵塞特性,在堵塞系数达到峰值之前,BSL模型的预测结果与实验结果最相近,而在堵塞系数达到峰值之后k-ε模型的预测结果与实验结果最相近,虽然k-ω模型预测的堵塞系数在整个流向位置都偏高,但堵塞系数沿流向的分布规律与实验结果吻合最好。

In order to study the ability of commonly used turbulence models to predict the rotor blade tip leakage flow(TLF) in axial compressor,experimental studies and numerical simulations of a low-speed axial compressor were conducted to compare and analyze the differences and similarities of the flow field distribution,swirl characteristics,and blockage characteristics of the rotor blade tip leakage flow predicted by different turbulence models with the experimental results.The results show that for the tip leakage vortex(TLV),both the trajectory slope of the TLV at the near-stall point,the location distribution along the circumferential direction and the area of the TLV core predicted by the k-ω model match best with the measured results;for the blockage characteristics of the TLF,the BSL model matches best with the experimental results before obtaining the peak value of the blockage coefficient,while the k-ε model matches best with the experimental results after obtaining the peak value of the blockage coefficient.The distribution law of the blockage coefficient along the streamwise direction simulated by the k-ω model is the closest one compared with measured results though its value in all the streamwise locations is a little higher than the measured results.