SUPPRESSION OF CAVITATION SURGE OF A HELICAL INDUCER OCCURRING IN PARTIAL FLOW CONDITIONS
SUPPRESSION OF CAVITATION SURGE OF A HELICAL INDUCER OCCURRING IN PARTIAL FLOW CONDITIONS
复制标题
部分流工况下螺旋导流管空化浪涌的抑制
DOI：
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
A. Furukawa
中科院分区：
文献类型：
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作者：
N. Enomoto;Jun;K. Ishizaka;S. Watanabe;A. Furukawa
旋转空化、空化喘振等各种空化不稳定性一直是高速涡轮泵诱导轮研制中面临的严重问题。为了使诱导剂在工业领域得到广泛应用，必须避免或解决这些不稳定性。在本研究中，通过在诱导轮上游安装障碍板来尝试抑制在我们的螺旋诱导轮的部分流动条件下观察到的空化浪涌。使用了两种障碍板；其中之一是环形轴对称板，在最大近尖端区域阻塞39%的通道，以抑制部分流动条件下入口回流的增长。另一种是轴对称地阻塞流道的69%，并使入口变形，用于检验不对称流入对空化喘振的抑制效果。在本文中，首次报道了所提出的障碍板对诱导轮的扬程和吸力性能的影响。然后，通过测量诱导轮上游和下游壁压的频谱分析，给出了有/没有障碍板的空化喘振的起始区域。最后，利用高速视频观察和套管压力测量讨论了这些板块的抑制机制。
Various cavitation instabilities such as rotating cavitation, cavitation surge and etc., have been serious problems in developing high-speed turbopump inducer. These instabilities should be avoided or settled for applying inducers widely in industrial fields. In the present study, the attempts to suppress the cavitation surge, which has been observed under partial flow conditions in our helical inducers, are made by installing the obstacle plates just upstream of inducer. Two kinds of obstacle plates were used; One of which is a ring-shaped axi-symmetric plate with blockage of 39% passage at the maximum near tip region to suppress the growth of inlet back flow under partial flow conditions. The other is to block the flow axiasymmetrically up to 69% of flow passage and make the inlet distortion, being used to examine the suppressive effects of asymmetric inflow on the cavitation surge. In this paper, the effects of the proposed obstacle plates on the head-rise and suction performances of inducer are firstly reported. Then, the onset regions of cavitation surge with/without the obstacle plates are presented with spectrum analyses of measured wall pressures upstream and downstream of the inducer. Finally, the suppression mechanisms of those plates are discussed utilizing the high-speed video observations as well as casing pressure measurements.