前置导叶调节混流泵性能的数值模拟

利用有限元分析软件数值求解不同工况下混流泵的内部流场，了解前置导叶调节工况的基本规律，以改善混流泵在非设计工况运行时的水力性能。在叶轮叶片进口部位读取液流流入叶轮时绝对液流角、相对液流角、和绝对速度圆周分量的值，分析其随前置导叶安放角改变而变化的规律。结果表明，叶轮进口绝对液流角小于前置导叶安放角，流量越小相差的幅度越大；大流量工况下进口预旋调节的效果比小流量工况更为明显；在一定流量范围内，通过进口导叶调节使得叶轮进口液流满足无冲击进口或者较小冲角进口条件，可有效地改善混流泵在非设计工况的水力性能。

Numerical simulation of inlet guide vane regulation for mixed-flow pump

In order to improve the hydraulic performance of the mixed-flow pump in off-design condition and master the basic principle of inlet guide vane regulating condition, authors conducted the numerical simulation for internal flow field of mixed-flow pump in different operating conditions by using finite element analysis software. With the modification of setting angle of the inlet guide vane, the change regulation of absolute flow angle, ralative flow angle and circumferential component of absolute velocity in impeller inlet were analyzed. The results showed that absolute flow angle was less than setting angle, and the smaller the flow was, the larger the difference was, and the effect of inlet guide vane regulation under large flow condition was more obvious than under small flow condition. The results also indicated that the inlet liquid flow can satisfy non-impact or smaller incidence angle inlet conditions in certain flow extent, and the pump can be operated with high efficiency in off-design conditon.