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| 1 | Experimental Investigation of Inter-Blade Vortices in a Model Francis Turbine显示文摘The inter-blade vortex in a Francis turbine becomes one of the main hydraulic factors that are likely to cause blade erosion at deep part load operating conditions. However, the causes and the mechanism of interblade vortex are still under investigation according to present researches. Thus the causes of inter-blade vortex and the effect of different hydraulic parameters on the inter-blade vortex are investigated experimentally. The whole life cycle of the inter-blade vortex is observed by a high speed camera. The test results illustrate the whole life cycle of the inter-blade vortex from generation to separation and even to fading. It is observed that the interblade vortex becomes stronger with the decreasing of flow and head, which leads to pressure fluctuation. Meanwhile,the pressure fluctuations in the vane-less area and the draft tube section become stronger when inter-blade vortices exist in the blade channel. The turbine will be damaged if operating in the inter-blade vortex zone, so its operating range must be far away from that zone. This paper reveals the main cause of the inter-blade vortex which is the larger incidence angle between the inflow angle and theblade angle on the leading edge of the runner at deep part load operating conditions. | Demin LIU Xiaobing LIU Yongzhi ZHAO | 2017 | Chinese Journal of Mechanical Engineering2017，30，4： | 6 |
| 2 | 基于模型试验的灯泡式水轮机轴向水推力研究显示文摘为了研究灯泡贯流式水轮机的轴向水推力问题,以某灯泡贯流式水轮机模型为研究对象,进行了该模型的轴向水推力试验。提出了比值Z(轴向水推力/水轮机驱动力)这一概念,研究了其随转速因数、叶片角度、导叶开度的变化规律。研究结果表明:该灯泡贯流式水轮机模型比值Z在某一区间范围,比值Z随转速因数的增大而增大、随导叶开度的增大而增大、随叶片角度的增大而减小。 | 李广府 卢池 姚丹 | 2014 | 中国农村水利水电2014，，12： | 3 |
| 3 | 尾水管加装整流筒后对其内部流态的影响显示文摘通过在尾水管的通道内设有前后两端开口的整流筒,利用CFD技术对典型工况进行了对比模拟研究,探究了加装整流筒前后对尾水管内部流态的影响.研究结果表明,在典型工况下,尾水管出口断面的压力分布相对比较均匀,整流筒直径为1.05D1时,压力升高最明显.计算了在不同条件下尾水管整流筒进口断面位置中心到壁面静压分布、整体轴中心截面压力分布以及监测了尾水管整流筒在进口处断面壁面上记录点的压力脉动随时间的变化情况.研究显示:整流筒直径为1.05D1时对改善尾水管内部压力场分布和抑制空化带来的影响起到了积极作用,安装整流筒的尾水管中轴面压力梯度减小,在尾水管的进口截面旋涡分散且数量减少,同时减小了中轴心与尾水管壁面的压差,尾水管的流场稳定性增加. | 杨栗晶 晏成明 张军 邓志辉 | 2018 | 排灌机械工程学报2018，36，2： | 2 |
| 4 | 整流筒对水轮机性能影响的CFD仿真研究显示文摘通过在尾水管的直锥段内安装同轴的两端开口的整流筒,在同一典型工况下,利用CFD技术对水轮机性能进行仿真计算,考察了计算水头在不同条件下的水轮机效率的影响,研究结果表明安装整流筒的尾水管的水轮机效率比原型尾水管的水轮机效率高,同时也说明整流筒的安装使压力分布较均匀,减少了流动漩涡,使水流的紊乱程度得到改善,涡带相对被抑制,流场的稳定性显著提高;并且缩小了轴心与周边尾水管壁水流间的压差,抑制了回流产生。 | 张劲 杨栗晶 邓志辉 | 2020 | 珠江水运2020，，5： | 0 |
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