| 郑源,李丽,陈会向,李东阔,李城易.轮毂比对灯泡贯流式水轮机性能影响研究[J].水利学报,2018,49(10):1303-1311 |
| 轮毂比对灯泡贯流式水轮机性能影响研究 |
| Influence of hub ratio on hydraulic performance and structural strength of bulb tubular turbine |
| 投稿时间：2018-07-06 |
| DOI：10.13243/j.cnki.slxb.20180618 |
| 中文关键词: 灯泡贯流式水轮机 轮毂比 水力性能 结构强度 数值模拟 |
| 英文关键词: bulb tubular turbine hub ratio hydraulic performance structural strength numerical simulation |
| 基金项目:国家自然科学基金重点项目（51339005）；国家自然科学基金项目（51579080）；安徽省自然科学基金面上项目（1608085ME119） |
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| 中文摘要: |
| 为了深入细致研究轮毂比对灯泡贯流式水轮机水力性能和结构强度的影响，基于ANSYS CFX软件分别对五种轮毂比三种协联工况下的水轮机模型进行数值模拟计算，对定常及非定常的计算结果进行分析，确定该水轮机的最佳轮毂比，并基于ANSYS Workbench平台对固体域进行单向流固耦合计算，对轮毂比优化前后的水力性能及转轮部分结构静应力进行对比分析。结果表明：由原始轮毂比0.35缩小至最优轮毂比0.31后，流道过流面积增大，过流量增加，机组运行效率及出力得到提高；叶片背面压差减小，流速更均匀；流道内压力脉动最大幅值由6.60%降低至0.46%；转轮部分位移变形和静应力分布规律基本一致，最大位移和最大静应力值小幅度增大，均仍满足结构强度要求。研究结果为解决该型式水轮机出力不足的问题提供参考，对水轮机的优化设计和制造具有指导意义。 |
| 英文摘要: |
| In order to deeply study the influence of hub ratio on the hydraulic performance and structural strength of the bulb tubular turbine, several 3D numerical simulations of five hub ratios were carried out with three different working conditions through widely used ANSYS CFX software. The steady and unsteady calculation results were analyzed and the optimum hub ratio of the turbine was determined. The one-way fluid and structure interaction calculation was carried out based on the ANSYS Workbench platform, and the hydraulic characteristics and the static stress of the partial structure of the runner before and after the hub ratio optimization were compared and analyzed. The results showed that, after the reduction from the original hub ratio 0.35 to the optimal hub ratio 0.31, the passage flow area increases as well as the flow rate, which lead to the improvement of the operating efficiency and the unit output. Besides, the pressure difference at back of the blade decreases, and the flow velocity becomes more uniform. Furthermore, the maximum amplitude of pressure pulsation reduces from 6.60% to 0.46%, and the displacement deformation and static stress distribution of the runner are basically the same. Both the maximum displacement and the maximum static stress increase slightly and still meet the structural strength requirements. The research results in this paper could provide a reference for solving the problem of insufficient output of this type of turbine,which have a guiding significance for the optimal design and manufacture of the hydraulic turbine. |
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