大型轴流泵水力不稳定区研究

大型轴流泵的水力不稳定区的存在不仅影响泵站安全启动,而且限制泵站稳定运行的范围。当同一扬程点下对应3个流量点时,轴流泵运行工况点进入水力不稳定区,在闭式试验台条件下,该区范围为谷峰和谷底之间的区域。轴流泵旋转失速与进水条件恶化是导致水力不稳定区产生的二大因素。随着南水北调跨流域调水工程建设和全国大中型泵站改造的实施,如何预防和避免大型轴流泵进入水力不稳定区显得非常迫切和重要。

Hydraulic Unstable Operating Region of Large Scale Axial Flow Pump

The unstable operating region affected safety of pump start-up and limited the range of stable operating.When there are three flowrates points matching along with one lift,the hydraulic unstable operating region happened.The range area of unstable operation region is from peak to bottom of performance curve when the axial flow pump was test on the closed test rig.There are two factors,rotating stall and bad inlet condition,which cause the unstable operating region.It is important to prevent and avoid unstable operating region along with the construction of South to North water transfer of China and reconstruction of large scale pumping station.