前置导叶对轴流泵马鞍区工况回流涡特性的影响

发布时间：2018-05-10 09:45

本文选题：轴流泵 + 回流涡　；参考：《农业机械学报》2016年04期

【摘要】：基于RANS方程和SST k-ω湍流模型,对带前置导叶轴流泵进行三维非定常计算,研究了"马鞍区"工况进水流道回流涡的特性以及前置导叶对回流涡结构及压力脉动的影响,揭示了前置导叶提高轴流泵"马鞍区"工况扬程的机理。结果表明,小流量工况,轴流泵进水流道内形成大范围螺旋形回流,其与主流的剪切作用导致回流涡的产生,引起大量低频压力脉动,并造成能量损失,致使泵扬程下降,出现马鞍形;增设前置导叶可打破连续的回流涡,降低低频压力脉动幅值,提高轴流泵运行稳定性;同时,前置导叶可提高轴流泵扬程,消除扬程曲线马鞍形,且随着前置导叶位置不断靠近叶轮进口,泵扬程提高幅值不断增大;最后,前置导叶调角可进一步提高轴流泵扬程。
[Abstract]:Based on RANS equation and SST k- 蠅 turbulence model, the three-dimensional unsteady calculation of axial flow pump with front guide vane is carried out. The characteristics of reflux vortex in inlet passage under "saddle zone" condition and the influence of leading vane on the structure and pressure pulsation of inlet passage are studied. The mechanism of increasing the lift of the axial flow pump under saddle condition is revealed by the front guide vane. The results show that a large range of spiral reflux is formed in the inlet passage of the axial flow pump under small flow conditions. The shearing effect between the axial flow pump and the main stream results in the formation of the reflux vortex, which causes a large number of low frequency pressure pulsation and energy loss, resulting in the decrease of the pump head. Saddle shape appears; the addition of the front guide vane can break the continuous backflow vortex, reduce the amplitude of low frequency pressure pulsation, and improve the operating stability of the axial flow pump. At the same time, the front guide vane can increase the head of the axial flow pump and eliminate the saddle shape of the lift curve. With the position of the leading vane approaching to the inlet of the impeller, the amplitude of the pump head increases continuously. Finally, the angle adjustment of the front guide vane can further improve the axial flow pump head.
【作者单位】：武汉大学水资源与水电工程科学国家重点实验室;中国灌溉排水发展中心;
【基金】：“十二五”国家科技支撑计划项目(2012BAD08B03)
【分类号】：TH312

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