转动惯量对吉县提黄泵站水力过渡过程的影响

The Influence of Rotational Inertia on the Hydraulic Transition Process of Yellow Pumping Stations in Ji-xian County

转动惯量不仅是描述水泵机组运行状况的重要参数,也是进行输水系统水力过渡过程分析、安全防护研究和优化设计的重要技术参数,对停泵水锤计算具有很大影响。论文以吉县东城提黄灌溉工程一级泵站为研究对象,利用水锤计算软件对其突然停泵过程进行模拟计算,分析无阀和两阶段缓闭蝶阀作用下不同转动惯量对其水力过渡过程的影响。模拟结果证实无阀和两阶段缓闭蝶阀作用时增大机组转动惯量可以有效减少水锤升压和降低水泵倒转转速,且随着转动惯量持续增大,减压效果和降低水泵倒转转速越发不显著;两阶段缓闭蝶阀作用时,会在一定程度上增大水锤升压,且可能减弱增加机组转动惯量的降压效果。调节水泵转动惯量对于输水管线水锤防护既经济又有效,对于推动水锤防护措施的发展具有一定的意义。

Rotational inertia of pumping units is not only the essential parameter to describe the running state of pump ,but also the significant parameter on an analysis of hydraulic transient ,research on safety protection and optimal design ,which has a great influ‐ence on the pump-stopping water hammer calculation .This paper has studied the First Pump Station of Ji-xian County＆#39;s eastern yellow irrigation project ,made use of water hammer computing software to simulate hydraulic transient of pumps at sudden power failure ,and analyzed the connection between different rotational inertia and hydraulic transient under two-stage slow-closing butterfly valve and no valve conditions .The results show that increasing rotational inertia of pumping unit under no valve and two-stage slow-closing butterfly valve conditions ,can reduce water hammer pressure and decrease the reverse rotate speed of pumps ,and as rota‐tion inertia is growing ,decompression effect and pump reverse rotate speed reduction are weakened .Under two-stage slow-closing butterfly valve conditions ,water hammer pressure is increasing to a certain degree ,which may have a bad effect on decreasing the water hammer pressure made by increasing rotational inertia of the pump .Adjusting rotational inertia of the pump in water hammer protection is economical and effective ,which will promote the development of water hammer protection measures .