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竖轴水轮机在瞬态启动过程中旋转角速度随时间不断变化,为了解决常规的定转速数值方法不能模拟上述过程的问题,利用开源软件OpenFOAM中SixDoFRigidBodyMotion模块的耦合算法实现了竖轴水轮机的瞬态启动过程.通过CFD(计算流体力学)方法着重分析水轮机转动惯量和阻尼值对启动过程的影响,发现两叶片竖轴水轮机的最佳启动位置角约为110°.通过对比须设置阻尼值的耦合模拟方法和定转速模拟方法,发现两者均可得出水轮机功率系数随转速变化的规律,而前者更接近水轮机的真实运转工况.
In order to solve the problem that the conventional numerical method of constant speed can not simulate the above process, the transient start of vertical axis turbine is realized by the coupling algorithm of SixDoFRigidBodyMotion module in open-source software OpenFOAM The CFD (Computational Fluid Dynamics) method was used to analyze the influence of the moment of inertia and damping on the start-up process and found that the optimal starting position angle of the two-blade vertical-axis turbine is about 110 °. Coupling simulation of damping value Method and fixed rotation speed simulation method, it is found that both of them can get the rule that the turbine power coefficient changes with the rotation speed, while the former is closer to the actual working condition of the turbine.