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Numerical simulation and experimental study of heat-fluid-solid coupling of double flapper-nozzle servo valve

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Abstract

The double flapper-nozzle servo valve is widely used to launch and guide the equipment. Due to the large instantaneous flow rate of servo valve working under specific operating conditions, the temperature of servo valve would reach 120°C and the valve core and valve sleeve deform in a short amount of time. So the control precision of servo valve significantly decreases and the clamping stagnation phenomenon of valve core appears. In order to solve the problem of degraded control accuracy and clamping stagnation of servo valve under large temperature difference circumstance, the numerical simulation of heat-fluid-solid coupling by using finite element method is done. The simulation result shows that zero position leakage of servo valve is basically impacted by oil temperature and change of fit clearance. The clamping stagnation is caused by warpage-deformation and fit clearance reduction of the valve core and valve sleeve. The distribution rules of the temperature and thermal-deformation of shell, valve core and valve sleeve and the pressure, velocity and temperature field of flow channel are also analyzed. Zero position leakage and electromagnet’s current when valve core moves in full-stroke are tested using Electro-hydraulic Servo-valve Characteristic Test-bed of an aerospace sciences and technology corporation. The experimental results show that the change law of experimental current at different oil temperatures is roughly identical to simulation current. The current curve of the electromagnet is smooth when oil temperature is below 80°C, but the amplitude of current significantly increases and the hairy appears when oil temperature is above 80°C. The current becomes smooth again after the warped valve core and valve sleeve are reground. It indicates that clamping stagnation is caused by warpage-deformation and fit clearance reduction of valve core and valve sleeve. This paper simulates and tests the heat-fluid-solid coupling of double flapper-nozzle servo valve, and the obtained results provide the reference value for the design of double flapper-nozzle force feedback servo valve.

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Authors and Affiliations

  1. Hebei Provincial Key Laboratory of Heavy Machinery Fluid Power Transmission and Control, Yanshan University, Qinhuangdao, 066004, China

    Jianhua Zhao, Songlin Zhou, Xianghui Lu & Dianrong Gao

  2. Hebei Vocational & Technical College of Building Materials, Qinhuangdao, 066004, China

    Xianghui Lu

Authors
  1. Jianhua Zhao
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  2. Songlin Zhou
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  3. Xianghui Lu
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  4. Dianrong Gao
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Corresponding author

Correspondence to Dianrong Gao.

Additional information

Supposed by National Natural Science Foundation of China (Grant No. 51075348), Hebei Provincial Natural Science Foundation of China (Grant No. E2011203151), and Research Fund for Doctoral Program of Higher Education of China (Grant No. 20101333110002)

ZHAO Jianhua, born in 1983, is currently a lecturer at School of Mechanical Engineering, Yanshan University, China. He received his bachelor degree in 2006, master degree in 2010, PhD degree in 2013 from Yanshan University, China. His research interests include simulation and analysis of hydrostatic bearing and servo valve, and so on.

ZHOU Songlin, born in 1988, is currently a master candidate at School of Mechanical Engineering, Yanshan University, China. His research interests include simulation and analysis of servo valve.

LU Xianghui, born in 1979, is currently a lecturer at HeBei Vocational & Technical College of Building Materials, China. Her research interests is simulation and analysis of servo valve.

GAO Dianrong, is currently a professor at School of Mechanical Engineering, Yanshan University, China. He received his bachelor degree in 1984, master degree in 1987, PhD degree in 2001 from Yanshan University, China. His research interests include CFD, PIV and new types of fluid components and devices, and so on.

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Zhao, J., Zhou, S., Lu, X. et al. Numerical simulation and experimental study of heat-fluid-solid coupling of double flapper-nozzle servo valve. Chin. J. Mech. Eng. 28, 1030–1038 (2015). https://doi.org/10.3901/CJME.2015.0417.045

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  • DOI: https://doi.org/10.3901/CJME.2015.0417.045

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