畸变进气条件下风扇三维非定常流动数值模拟

分析畸变进气情况下轴流风扇/压气机三维流场和性能的三维可压缩模型.该模型利用流线曲率法求得叶片对气流做功的叶轮机源项,然后通过求解带源项的三维非定常Euler方程,对风扇/压气机内部三维流场和性能进行模拟.利用该模型对某一跨音速风扇转子的三维流场和性能进行了数值模拟分析,特别是分析对比了在进口无畸变和进口有畸变情况下的风扇内部三维流场和气动性能.研究结果表明,该三维理论预测模型能有效地分析进气畸变对轴流风扇性能及其稳定性的影响.

Numerical Simulation Study of a Three-dimensional Unsteady Flow in a Fan Under Distorted Air Admission Conditions

Analyzed was a three-dimensional compressible model for calculating three-dimensional flow fields and performance of an axial-flow fan/compressor,in which a streamline curvature method was adopted to obtain a source term of a turbine doing work to air flows by blades.Subsequently,by seeking solutions to a three-dimensional unsteady Euler equation involving the source term,a simulation was performed of an inner three-dimensional flow field and performance of a fan/compressor.By using the model,the three-dimensional flow field and performance of a transonic fan rotor were numerically simulated and analyzed,especially,the three-dimensional inner flow fields and aerodynamic performance in the absence and presence of an abnormal inlet distortion were analyzed and compared.The research results show that the three-dimensional-theory-based prediction model can effectively analyze the influence of an inlet air distortion on the performance and stability of an axial-flow fan.