水能回收装置蜗壳内流场的CFD分析

Analysis of internal flow field within spiral case as water-power recoverer by using CFD

基于叶片式流体机械的工作原理研究开发出一种无活动导叶卧式轴流式水能回收装置.为了优化结构、保证性能和提高水能回收效率,采用CFD技术对其蜗壳的内部复杂紊流流场进行三维黏性流动的数值模拟,以取代模型试验和缩短研制周期.通过对该装置流场的CFD数值模拟和可视化分析结果表明,圆形断面的蜗壳进水均匀,形成的速度环量比矩形断面的更好,为水能回收装置引水部件的结构优化设计提供了依据.

On the basis of operational principle of bladed fluid machines, a wicket-gate-free axial-flow wa- ter-power recoverer was researched and developed. In order to optimize the structure, ensure the performances and increase the efficiency of the water-power recoverer, a 3-dimensional viscous numerical simulation of the complex turbulent flow field inside the spiral casing was carried out with CFD technique for replacing the model test and saving the period of R＆D process. With the help of numeric simulation of flow field in this recoverer by using CFD and visual analysis of the flow field, it was shown that the hydraulic performance of the spiral casing with circular cross-section would be superior to the one with rectangular cross-section in respect of inflow uniformity and velocity circulation generated, providing a basis for structure optimization design of the inducer components of the water-power recoverer.