针对微水头低流速水域流速梯度的问题,在水轮机导流罩基础上设计一种采集装置,使水轮机能提前采集低流速水流, 用结构补偿流量, 并通过数值模拟与试验相结合的方法,研究在非均匀流中加装采集装置对水轮机水动力性能的影响。结果表明：加装采集装置可减弱流速梯度对水轮机水动力性能的影响, 在低流速时作用明显。同时加装采集装置可增大水轮机输出功率, 减小启动流速,输出功率最多增大约2.2倍,启动流速可减小约0.1 m/s。
Abstract
In order to solve the problem of velocity profile in low-velocity water area with micro-head, a collection device is designed on the basis of turbine shroud, so that the turbine can collect low velocity flow ahead of time. By combining numerical simulation and experiment, the influence of installing acquisition device on the hydrodynamic performance of the turbine in non-uniform flow is studied. The results show that the influence of velocity gradient on the hydrodynamic performance of the turbine can be reduced by installing the acquisition device. The influence of velocity profile on the hydrodynamic performance of the turbine can be reduced by installing a data acquisition device, which is obvious at low velocity. At the same time, the output power can be increased by 2.2 times and the starting flow rate can be reduced by about 0. 1 m/s.
关键词
速度梯度 /
水轮机 /
微水头 /
数值模拟 /
流体动力学
Key words
velocity gradients /
water turbines /
micro-head /
numerical simulation /
hydrodynamics
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基金
山西省回国留学人员科研资助项目（2020-110）
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