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基于雷诺平均的Navier-Stokes方程和结构网格技术,采用五阶空间离散精度的WCNS格式,开展了SST两方程模型不同湍流生成项对低速流动数值模拟的计算分析。主要目的是为高阶精度格式在复杂外形上的应用提供技术支撑。计算模型包含了低速NLR7301两段翼型和Trap Wing高升力构型,研究内容主要包括不同湍流生成项对收敛历程、边界层湍流粘性系数分布、边界层速度分布、压力系数分布、气动特性的影响。在与试验数据对比的基础上,计算结果表明:对于低速二维流动,不同湍流生成项对收敛历程有比较明显的影响,对附面层湍流粘性系数分布和速度型影响不明显,不同湍流生成项主要影响主翼前缘的吸力峰值,进而影响升力系数和压差阻力系统;对于低速三维流动,不同湍流生成项对低速流动的收敛特性影响不明显,对翼梢涡的模拟精度有比较明显的影响,进而影响翼梢站位的压力分布和总体气动特性。
Based on the Reynolds-averaged Navier-Stokes equations and the structural grid technique, a WCNS scheme with five-order spatial discretization is adopted to calculate and analyze the numerical simulation of low-velocity flow under different SST two-equation models. The main purpose is to provide technical support for the application of high-precision format in complex shape. The computational model includes the low-speed NLR7301 two-stage airfoil and the Trap Wing high-lift configuration. The main contents of the study include the influence of different turbulence generation on convergence history, boundary layer turbulent viscosity distribution, boundary layer velocity distribution, pressure coefficient distribution and aerodynamic characteristics . Based on the comparison with the experimental data, the calculation results show that for low-velocity two-dimensional flow, the different turbulence generation items have obvious influence on the convergence history, but have no obvious influence on the turbulent viscosity distribution and velocity type, Term affects the lift coefficient and the pressure drop resistance system. For the low-velocity three-dimensional flow, the different turbulence generation has no obvious effect on the convergence of the low-velocity flow, and the simulation accuracy of the tip-tip vortex is more obvious Affect, and then affect the pressure distribution of the tip station and the overall aerodynamic characteristics.