基于计算流体动力学的波力直驱式水轮机性能研究

Analysis of performance of wave direct driving turbine based on computational fluid dynamics

对一种新式、由波浪直接驱动的水轮机性能进行了研究,该波力直驱水轮机导叶为固定式,转轮与冲击式透平相类似.该波能转换装置既可以是近岸固定型的,也可以是海上漂浮型的.在雷诺时均N-S方程基础上,采用有限体积法和标准k-ε紊流模型,对该水轮机内部流动进行了三维数值模拟,并利用数值计算结果对其水头、转速特性进行了研究,还考察了径间比、轮毂比对该水轮机工作性能的影响.研究表明,该波力直驱水轮机具有宽的高效率区,对水头(波高)变化的适应性强,启动性能好等优点.通过以上研究还获得了该水轮机较优的设计参数.

The paper researches on the performance of a newly developed direct driving turbine （DDT） for wave energy conversion by using the Fluent code. The new DDT is an impulse turbine with fixed guide vane; it can be installed in the offshore breakwater or float on the sea. The numerical simulation is based on the Reynolds-averaged Navier-Stokes equations, closed with the standard κ-ε turbulence model. The governing equations are discretized with non-staggered grid by means of the finite volume method. The effects of gap to chord ratio and hub ratio on the performance are investigated; and the hydraulic character- istics of this new DDT are analyzed. Studies show that the DDT has wide zone of high efficiency and good starting characteristics. The optimum design geometry of the turbine is also given.