轴流悬浮式水轮机抗倾覆性仿真研究

Simulation on the Anti-Overturning of Suspension Type Axial Flow Turbine

基于CFD软件,采用有限体积法,以及固定式轴流水轮机构造原理与可根据海流方向做自适应调整的轴流、悬浮式潮流能水轮机结构,通过数值仿真,开展了悬浮式水轮机系统在数种工况下的纵向方向抗倾覆稳定性分析。对比了不同流速与不同倾向角之间的共30种组合工况,分析了流速与倾向角对水轮机总纵力矩的影响,发现在不同工况下,该悬浮式水轮机在纵向方向上抗倾覆性能良好,在各流速工况下,均能在小倾角范围内达到稳定平衡状态,纵向稳定状态工况下静水面平行线与水轮机中轴线夹角γ保持在2°~3°左右。本文研究结果可为轴流悬浮式水轮机的抗倾覆稳定性计算提供一定参考。

By using CFD software and finite volume method and referring to the structural principle of fixed axial-flow turbine and the structure of suspension type axial flow tidal current turbine which can be adaptive adjustable according to the current direction,the anti-overturning stability of the suspension type tidal current turbine system in the longitudinal direction is analyzed under several conditions through numerical simulation.Totally 30 combined conditions between different flow velocities and inclination angles are compared and the influences of the flow velocity inclination angle on the total longitudinal moment of the turbine are analyzed.It has been found that under different conditions the tidal current turbine system is good in the anti-overturning performance in the longitudinal direction and can reach a stable equilibrium state in the range of small inclination angles under all flow velocity conditions.Under the condition of longitudinal steady state the included angle g between the parallel line of static water surface and the central axis of the turbine can be kept at about 2~3degree.All these results can offer some reference for the calculation of the anti-overturning stability of the suspension type tidal current turbine.