【摘要】 采用全三维粘性数值模拟技术,利用由Menter基于k-ω模型和k-ε模型发展而成的BSL双方程湍流模型(BaselineModel),采用"混合平面"方法传递级间参数,通过求解三维粘性可压缩Favre平均Navier-Stokes方程,对一个考虑应用变几何涡轮技术的舰船动力涡轮三维粘性流场进行了数值研究。变几何涡轮的显著特点是采用可调导叶技术,进而使其透平叶栅可能在大攻角范围内运行。由此通过多级计算,计及动静干涉效应和动叶顶间隙的影响,从而更准确地预测透平叶栅的大攻角流场特性,以期把握变几何涡轮技术的气动设计特点。更多还原

【Abstract】 One of the most advanced two-equation eddy-viscosity turbulence models of menter in engineering applications, Baseline (BSL) model utilizes the original k-ω model of wilcox in the inner region of the boundary layer and switches to the improved k-ε model for compressible flow in the outer region. Using mixing planes between the eight blade rows, the Favre-average Navier-Stokes equations coupled the BSL model is applied to a numerical simulation of 3-D viscous flow through the variable-geometry power turbine, within a multistage environment, the turbine cascades will probably work at large incidence, particularly at reduced-mass-flow operation by the use of power turbine variable area nozzles(VAN). This paper presents the results of the multistage simulation including tip clearance, which will help us to realize the aerodynamic performance of the variable-geometry power turbine for marine gas turbine, as well as the complex flow structure of the turbine cascades at large incidence.更多还原