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首页> 外文期刊>Energy Conversion & Management >A numerical study of cavitation phenomenon in a flapper-nozzle pilot stage of an electrohydraulic servo-valve with an innovative flapper shape
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A numerical study of cavitation phenomenon in a flapper-nozzle pilot stage of an electrohydraulic servo-valve with an innovative flapper shape

机译：具有新颖挡板形状的电动液压伺服阀的挡板喷嘴先导级中的气穴现象的数值研究

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摘要

The flapper-nozzle pilot stage, whose performance can be deteriorated by the generated flow cavitation phenomenon, is a vital segment in achieving precise control of electrohydraulic servo-valves. Aiming to find out a reasonable flapper shape to reduce cavitation, this paper presents a numerical study of cavitation phenomenon in a flapper-nozzle pilot stage with different flapper shapes. A simple rectangular shape, carefully designed without disturbing the flow control characteristics of the pilot stage, is set as an innovative flapper shape in this work. Cavitation phenomena in the pilot stage are simulated for both of the traditionally used flapper shape and the innovative flapper shape at flow conditions with various nozzle inlet pressures, 1 MPa to 7 MPa. Then, systematic comparison of resulted cavitation phenomena for the two different flapper shapes is carried out. The results confirm that, for both flapper shapes, cavitation commonly occurs along the nozzle tip wall beyond stagnation region. The curved edge in traditionally used flapper shape is a massive contributor of cavitation in the pilot stage and the selected innovative shape shows a significant reduction of cavitation on its surface. From the flow structure, it is also noticeable that undesired transverse lateral force of sheded vortices is eliminated by using the innovative flapper shape. Meanwhile, the innovative flapper shape highlights the same effectiveness on the performance of flow control as the traditionally used flapper shape. Thus, a simple and effective flapper shape is proposed for cavitation reduction in the flapper-nozzle pilot stage of an electrohydraulic servo-valve.
机译：挡板喷嘴先导级的性能会因所产生的气穴现象而恶化，是实现电动液压伺服阀精确控制的重要组成部分。为了找到合理的挡板形状以减少气穴现象，本文对不同挡板形状的挡板-喷嘴试验阶段的气穴现象进行了数值研究。精心设计的简单矩形形状在不影响先导级流量控制特性的情况下，被设定为这项工作中的创新挡板形状。在流量条件下，使用各种喷嘴入口压力（1 MPa至7 MPa），对传统使用的挡板形状和创新挡板形状进行了试验阶段的空化现象模拟。然后，对两种不同的挡板形状产生的气穴现象进行了系统的比较。结果证实，对于两种挡板形状，通常在超出停滞区域的情况下沿喷嘴尖端壁发生气蚀。传统上使用的挡板形状的弯曲边缘在试验阶段是空化的重要因素，并且所选的创新形状显示出其表面上的空化显着减少。从流动结构中，还值得注意的是，通过使用创新的襟翼形状，消除了涡旋涡流的不必要的横向侧向力。同时，创新的挡板形状在流量控制性能上与传统使用的挡板形状具有相同的效果。因此，提出了一种简单有效的挡板形状，用于减少电动液压伺服阀的挡板喷嘴先导级中的气穴现象。

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  • 来源
    《Energy Conversion & Management》 |2014年第1期|31-39|共9页
  • 作者

    Nay Zar Aung; Songjing Li;

  • 作者单位

    Department of Fluid Control and Automation, Harbin Institute of Technology, Box 3040, Science Park, No. 2, Yikuang Street, Nangang District, Harbin 150001, PR China;

    Department of Fluid Control and Automation, Harbin Institute of Technology, Box 3040, Science Park, No. 2, Yikuang Street, Nangang District, Harbin 150001, PR China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Cavitation; Flapper-nozzle pilot stage; Electrohydraulic servo-valve; Innovative flapper shape;

    机译：空化挡板喷嘴试验台;电液伺服阀创新的挡板形状;

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