管道几何参数对双向水流整流装置性能的影响

Influence of Pipe Geometry Parameters on the Performance of Bidirectional Flow Rectifier

双向水流整流装置的几何参数会对其性能产生较大影响,进而影响整个发电装置的性能。为提高双向水流的能量利用率,以水流流速与叶片获得速度的平均流速比作为衡量双向水流整流装置性能的指标,通过数值仿真,对装置的内外转角半径以及出入口过渡段长度进行优化,研究提高水轮机叶片获得功率的方法。研究与仿真分析表明,当双向水流整流装置上下管道内外转角半径相等且均为2倍管道直径,以及当双向水流整流装置上下管道内外转角半径分别为1.5倍管道直径和2倍管道直径时,可以获得较好的工作性能;当双向水流整流装置出入口过渡段长度为0.4倍管道直径时,也有利于改善双向水流整流装置的性能。

The geometric parameters of the bidirectional flow rectifier will have a great influence on its performance,and then affect the performance of the whole power generation device.In order to improve the energy utilization rate of bidirectional flow,the average velocity ratio between flow velocity and blade velocity was taken as the index to measure the performance of the bidirectional flow rectifier.Through numerical simulation,the radius of inside and outside rotation angle of the device and the length of the inlet and outlet transition section were optimized,and the method to improve the turbine blade power was studied.The research and simulation analysis shows that the better performance can be achieved when the inner and outer corner radii of the upper and lower pipes of the bidirectional flow rectifying device are equal and two times the pipe diameter,and when the inner and outer corner radii of the upper and lower pipes of the bidirectional flow rectifying device are 1.5 and 2 times the pipe diameter,respectively.When the length of the transition section of the inlet and outlet of the two-way water flow rectifier device is 0.4 times the pipe diameter,it is also conducive to improving the performance of the two-way water flow rectifier device.