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Numerical and experimental investigation of leakage behavior at null position of high-pressure electro-pneumatic servo valve

高压电-气伺服阀间隙结构的零位泄漏特性

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Abstract

The high-pressure electro-pneumatic servo valve (HESV) is a core element of the high-pressure pneumatic servo system. The annular clearance and the rounded corner of the spool-sleeve can cause the leakage at null position, thereby affecting high-precision control and stability of the servo system. This paper investigates the effects of the clearance structure on leakage behavior at null position of the HESV. A numerical approach was employed to evaluate the effects, and then a mathematical model was established to obtain the variation law of leakage flow rate at null position. The results indicate that the leakage flow rate at null position varies linearly with supply pressure and rounded corner radius, and is nonlinear as a quadratic concave function with annular clearance. The leakage flow rate of the annular clearance and the rounded corner varies with the valve opening in an invariable-nonlinear-linear trend. A test rig system of leakage behavior at null position of the HESV was built to confirm the validity of the numerical model, which agrees well with the conducted experimental study.

摘要

高压电-气伺服阀是高压气动伺服系统的核心部件, 其阀芯阀套结构存在的环形间隙和圆角等问 题, 导致了伺服阀在零位时产生泄漏, 从而影响伺服系统的高精度控制和稳定性. 为了研究高压电气 伺服阀间隙结构对零位泄露特性的影响, 首先, 建立了伺服阀内部跨尺度流场计算模型, 并采用计算-流体力学的方法, 分析了高压电-气伺服阀间隙结构对零位泄漏特性的影响; 然后, 建立了高压气体零 位泄漏流量的数学模型, 得到了带有环形间隙和阀芯圆角的高压电-气伺服阀流量随阀口开度变化的规 律. 结果表明, 滑阀伺服阀零位泄漏量与气体压力和圆角半径变化近似呈线性关系, 与环形间隙高度 呈二次凹函数曲线关系; 带有环形间隙和圆角的高压电-气伺服阀流量随着阀口开度变化的趋势是恒定 −非线性−线性. 最后, 搭建了伺服阀零位泄漏流量特性测试系统, 并通过实验验证了数值计算方法的 准确性.

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Authors and Affiliations

  1. FESTO Pneumatics Centre, School of Mechanical Science & Engineering, Huazhong University of Science & Technology, Wuhan, 430074, China

    Di-jia Zhang  (张迪嘉), Long-long Gao  (高隆隆), Zhi-xin Zhao  (赵祉昕) & Bao-ren Li  (李宝仁)

  2. China Ship Development and Design Center, Wuhan, 430074, China

    Chuan Wu  (吴川)

Authors
  1. Di-jia Zhang  (张迪嘉)
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  2. Long-long Gao  (高隆隆)
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  3. Chuan Wu  (吴川)
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  4. Zhi-xin Zhao  (赵祉昕)
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  5. Bao-ren Li  (李宝仁)
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Corresponding author

Correspondence to Long-long Gao  (高隆隆).

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Foundation item

Project(51705164) supported by the National Natural Science Foundation of China

Contributors

The overall research objectives were developed by GAO Long-long, LI Bao-ren and ZHANG Di-jia. ZHANG Di-jia and GAO Long-long completed the simulation and experimental studies and worked with WU Chuan and ZHAO Zhi-xin to analyze the research data. The first draft of the manuscript was written by ZHANG Di-jia and GAO Long-long. All authors responded to the reviewers’ comments and revised the final version.

Conflict of interest

ZHANG Di-jia, GAO Long-long, WU Chuan, ZHAO Zhi-xin and LI Bao-ren declare that they have no conflict of interest.

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Zhang, Dj., Gao, Ll., Wu, C. et al. Numerical and experimental investigation of leakage behavior at null position of high-pressure electro-pneumatic servo valve. J. Cent. South Univ. 28, 3117–3126 (2021). https://doi.org/10.1007/s11771-021-4829-0

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  • DOI: https://doi.org/10.1007/s11771-021-4829-0

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