用于振荡水柱波能系统的径流式空气透平数值模拟研究

径流式空气透平是振荡水柱式波能发电系统的二级能量转换装置,因其具有结构简单、输出扭矩大、轴向推力小的优势,得到了越来越多的关注。采用计算流体力学软件Ansys-Fluent 12.0,通过数值模拟方法考察了不同转子叶片稠度对径流式空气透平定常无量纲评价参数的影响规律。研究结果表明:虽然径流式透平可在双向气流下实现单向旋转,但当气流通过方向不同时,透平的定常工作性能存在明显差异,这与传统轴流式透平完全不同;此外,稠度对透平效率的影响在不同流量系数范围内也不同。因此,综合考虑气流流向、透平整个工作范围内输出效率,推荐采用的转子叶片稠度为2.34。

Numerical study on a radial air turbine for the oscillating water column wave energy system

The radial-flow air turbine can be used in the secondary energy conversion process of an oscillating water column wave energy power generation system. Because of its simple structure with larger output torques and smaller axial thrusts, the radial turbine has attracted more attentions in this area. In this study, the commercial computational fluid dynamics software Ansys-Fluent 12.0 was used to investigate the effects of the rotor blade solidity on the steady non-dimensional performance parameters of a radial air turbine. The numerical results show that the radial turbine exhibits significant differences in the steady performance as the airflow direction changes, which is completely different from the traditional axial-flow turbine; in addition, the effects of the rotor blade solidity on the turbine efficiency also varies in different flow coefficient zones. Therefore, considering the air flow direction and the efficiency of the overall turbine operating range, the rotor blade consistency of 2.34 was recommended for application in this study.