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基于Realizable k-ε湍流模型和三维N-S方程,应用CFD软件FLUENT的滑动网格方法,对一种新型变攻角竖轴水轮机三维情况下的水动力响应及能量转换系数进行理论分析和数值模拟计算。研究结果表明:连接杆件的截面为NACA翼型时对转轴提供的附加扭矩大于圆形截面连接杆件;选取截面翼型为NACA4415的连接杆件对其安装角度的影响进行比较分析,可知当连接杆件翼型的弦线与来流平行时,能量转换系数最大,与实验数据有较高的吻合度。表明Realizable k-ε湍流模型是一种有效的数值模拟方法。
Based on Realizable k-ε turbulence model and 3D Navier-Stokes equations, the hydrodynamic response and energy conversion coefficient of a new type of vertical and horizontal axis turbine with varying angle of attack were analyzed theoretically and numerically by using the sliding mesh method of CFD software FLUENT . The results show that when NACA airfoil is used, the additional torque provided to the rotating shaft is larger than that of the circular cross-section connecting rod. The comparative analysis of the influence of the connecting rod with the airfoil NACA4415 on the mounting angle shows that when When the chord of the connecting rod airfoil is parallel to the incoming flow, the energy conversion coefficient is the largest and has good agreement with the experimental data. It shows that Realizable k-ε turbulence model is an effective numerical simulation method.