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首页> 外文期刊>International Journal of Heat and Mass Transfer >A numerical investigation in characteristics of flow force under cavitation state inside the water hydraulic poppet valves
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A numerical investigation in characteristics of flow force under cavitation state inside the water hydraulic poppet valves

机译：水力提升阀内气蚀状态下流动力特性的数值研究

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摘要

Compared with the oil hydraulic systems, cavitation is more serious in water hydraulic systems due to the higher saturated vapor pressure of water. Poppet valve is one of important hydraulic components and cavitation is easy to happen due to the sharp pressure drop caused by throttling. This paper presents a numerical investigation into the flow force and cavitation characteristics inside water hydraulic poppet valves. Three kinds of typical structures of poppet valves are selected in the research. The effects of geometric parameters and backpressure of the poppet valves on flow characteristics, cavitation and flow force have been analyzed. Considering the axisymmetric structure of the valves, a half of 2D mixture model is selected and a two-phase mixture model is adopted in the calculation. The accuracy of the numerical models has been validated by comparing the simulation results with the experiment data. The results reveal that two-stage throttle valve (TS valve) can effectively suppress the occurrence of cavitation while the flow force of TS valve is much bigger than that of other valves. By comparing the simulation results under two different boundary conditions (including with backpressure and without backpressure), it seems that cavitation could slightly decrease the flow force.
机译：与油压系统相比，由于水的饱和蒸气压较高，因此在水压系统中，气穴现象更为严重。提升阀是重要的液压元件之一，由于节流导致压力急剧下降，因此容易发生气穴现象。本文对水力提升阀内的流动力和空化特性进行了数值研究。本研究选择了三种典型的提升阀结构。分析了提升阀的几何参数和背压对流动特性，空化和流动力的影响。考虑到阀门的轴对称结构，选择了一半的二维混合模型，并采用了两相混合模型。通过将仿真结果与实验数据进行比较，已经验证了数值模型的准确性。结果表明，二级节流阀（TS阀）可以有效地抑制空化现象的发生，而TS阀的流动力要比其他阀大得多。通过比较两种不同边界条件（包括有背压和无背压）下的模拟结果，看来空化会略微减小流动力。

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  • 来源
  • 作者

    Mingxing Han; Yinshui Liu; Defa Wu; Xufeng Zhao; Huaijiang Tan;

  • 作者单位

    State Key Laboratory of Digital Manufacturing Equipment and Technology, School of Mechanical Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China;

    State Key Laboratory of Digital Manufacturing Equipment and Technology, School of Mechanical Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China;

    State Key Laboratory of Digital Manufacturing Equipment and Technology, School of Mechanical Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China;

    State Key Laboratory of Digital Manufacturing Equipment and Technology, School of Mechanical Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China;

    State Key Laboratory of Digital Manufacturing Equipment and Technology, School of Mechanical Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, 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

    Poppet valve; Cavitation; Flow force; Water hydraulic;

    机译：提升阀;空化流动力;水液压;

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