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CFD analysis of flow forces and energy loss characteristics in a flapper-nozzle pilot valve with different null clearances

机译：不同零间隙的挡板喷嘴先导阀中流体力和能量损失特性的CFD分析

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摘要

A well understanding on the flow forces and energy loss characteristics in a flapper-nozzle pilot valve is necessarily important in the performance improvement of a two-stage electrohydraulic servo-valve. This paper presents the CFD analysis of flow forces and energy loss characteristics in a flapper-nozzle pilot valve with different null clearances. Five different flapper-nozzle structures with three different null clearances of 0.1 mm, 0.05 mm and 0.033 mm are considered in this analysis. For every flapper-nozzle structure, the systematic CFD simulations of flow forces and energy loss characteristics are performed for seven different flow conditions varying nozzle inlet pressures from 1 MPa to 7 MPa. Experimental measurements are also conducted for energy loss characteristics and then compared with simulated results. Meanwhile, the CFD flow force results are verified with the results of exiting simplified flow force models and vice versa. From each nozzle side, the main flow force acting on the flapper is accompanied by four tiny lateral forces resulted from the impact of radial jet reattachment on the flapper curved surface. For each of given null clearances, the main flow force and lateral forces linearly increase with the increment of nozzle inlet pressure. For the same null clearance, applying larger flapper can give 1.5-13.6% larger lateral force in drag direction and 1.5-10.2% larger lateral force in lift direction compared to deploying smaller flapper. Compared to the main flow force, the magnitudes of the lateral forces on each corner of the flapper are found in the range of 0.8-3.2% in drag direction and 1.6-7.5% in lift direction. For main flow forces, the CFD simulated results show a good agreement with that of flow force model based on momentum conservation. Both existing flow force models are undoubtedly applicable in the prediction of flow forces for small null clearances (less than 0.05). Having a good agreement between each other, both experimental and numerical results show that the energy loss increases with the increment of null clearance and nozzle inlet pressure.
机译：很好地了解挡板喷嘴先导阀中的流动力和能量损失特性对于改进两级电动液压伺服阀的性能至关重要。本文介绍了具有不同零位间隙的挡板喷嘴先导阀中流体力和能量损失特性的CFD分析。在此分析中考虑了五个具有0.1 mm，0.05 mm和0.033 mm三个无效间隙的不同的挡板喷嘴结构。对于每种挡板式喷嘴结构，针对七个不同的流动条件（从1 MPa到7 MPa不等的喷嘴入口压力），进行了流体力和能量损失特性的系统CFD模拟。还针对能量损失特性进行了实验测量，然后与模拟结果进行了比较。同时，CFD流体力结果与现有简化流体力模型的结果进行了验证，反之亦然。从喷嘴的每个侧面，作用在挡板上的主流压力伴随有四个微小的横向力，这是由于径向射流重新附着在挡板弯曲表面上而产生的。对于每个给定的零间隙，主流力和横向力都随着喷嘴入口压力的增加而线性增加。对于相同的零间隙，与部署较小的挡板相比，使用较大的挡板可以在阻力方向上施加1.5-13.6％的横向力，在提升方向上提供1.5-10.2％的横向力。与主流力相比，挡板每个角上的横向力的大小在阻力方向上为0.8-3.2％，在举升方向上为1.6-7.5％。对于主流动力，CFD仿真结果与基于动量守恒的流动力模型具有很好的一致性。毫无疑问，这两种现有的流动力模型都可用于预测小的零位间隙（小于0.05）的流动力。实验结果和数值结果之间都具有很好的一致性，表明能量损失随着零间隙和喷嘴入口压力的增加而增加。

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  • 来源
    《Energy Conversion & Management》 |2014年第7期|284-295|共12页
  • 作者

    Nay Zar Aung; Qingjun Yang; Meng Chen; 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 Mechanical Engineering, Mandalay Technological University, Mandalay, Myanmar;

    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;

    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

    Flow forces; Energy loss; Flapper-nozzle pilot valve; Null clearance; Vortex; Radial jet reattachment;

    机译：流动力;能量损失;挡板喷嘴先导阀;空间隙;涡流;径向射流重装;

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