浸入式贴体网格边界方法的对转桨扇非定常流动数值模拟

应用所提出的浸入式贴体网格边界方法和开发的CFD程序,进行了对转桨扇跨声速全周叶片流场的非定常数值模拟。介绍了程序流程、网格生成策略和求解器原理。分析了前、后桨叶尖涡、尾缘涡的非定常干扰对叶片表面流场的影响。统计了对转桨扇的推力、功率和推进效率的非定常波动,并同NUMECA模拟的定常结果进行了对比,结果发现两种模拟得到的后桨总体参数差别大于10%。相比于NUMECA的对转桨扇单通道定常模拟,所提出方法及程序具有更为便利的网格构建,在使用相同量级网格总数的情况下,可以模拟全周叶片通道流场,并揭示对转桨扇无通道周期性的特征。 

Unsteady flow simulation of contra-rotating propfans using immersed body-fitted grids boundary method

An unsteady numerical simulation of the transonic flow of a full-circumferential blades of contra-rotating propfans was carried out by using the immersed body-fitted grids boundary method and the developed CFD program. The flow chart of this program, grid generation strategy and flow solver principle were introduced.The influence of unsteady interaction of tip and wake vortexes on the front and rear rotors was analyzed.The unsteady fluctuations of the thrust, power and propulsion efficiency of the contra-rotating propfans were calculated and compared with the corresponding results of NUMECA simulation. The difference between thrust and efficiency of the rear rotor simulated by those programs was more than 10%. Compared with NUMECA’s single channel steady simulation of contra-rotating propfans, the proposed method and program had more accurate simulation results and extremely convenient grid construction when using the the same order of total grids number.