Structural optimization and characteristics analysis of innovative flapper shape in a flapper-nozzle pilot valve

Peng, Jinghui; Aung, Nay; Li, Songjing

doi:10.1109/fpm.2015.7337128

Cited by 3 publications

(2 citation statements)

References 12 publications

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“…The rectangle remarkably depresses the cavitation by decaying its straight and relatively long turbulent jets on the flat ground [8,9]. Moreover, Peng [12] analyzed the mechanical properties of the innovated flapper shapes. According to the verified numerical model, the proposed innovative flapper shape maintains similar mechanical properties as the conventional shape.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Flow Force and Cavitation Phenomenon in the Pilot Stage of Electrical-Hydraulic Servo Valve under Temperature Shock

Yan

Ren

et al. 2022

Machines

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The flow field structure in the pilot stage of the electro-hydraulic servo valve is small and complex, and the extreme temperature environment will aggravate the self-excited oscillation, resulting in a decrease in the control accuracy of the servo valve. With the increase in temperature, the size of the orifice, the temperature characteristics of the fluid and the pressure loss in the flow pipe will influence the characteristics of the pilot stage. Considering the influence of temperature and pressure loss, a theoretical mathematical model is established to describe the flow force in the pilot stage. To verify the accuracy of the theoretical model, CFD simulations of the flow force at different inlet pressures and deflection positions and temperatures are analyzed in this paper. As the temperature rises, the oil viscosity rapidly decreases, which results in the flow force acting on the flapper increasing with the temperature. When the temperature exceeds 50 °C, the effect of oil viscosity is small, and the flow force tends to decrease slightly with the combined effect. As the supply oil pressure increases and the flapper moves toward the nozzle, the flow force acting on the flapper increases, and the trend is consistent with the CFD simulation results. An experimental device is designed, including establishing the experimental conditions and measuring the flow force to validate the theoretical model and to observe the cavitation phenomenon of the pilot stage.

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Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Flow Force and Cavitation Phenomenon in the Pilot Stage of Electrical-Hydraulic Servo Valve under Temperature Shock

Yan

Ren

et al. 2022

Machines

View full text Add to dashboard Cite

show abstract

“…However, the innovative flapper shapes could change the mechanical properties of the flapper, for example, natural frequency and static deformation, affecting the static and dynamic characteristics of the flapper-armature assembly. 14 Thus, further effort should be made to develop the methods for cavitation reduction in the flapper-nozzle servo-valves.…”

Section: Introductionmentioning

confidence: 99%

Cavitation and flow forces in the flapper-nozzle stage of a hydraulic servo-valve manipulated by continuous minijets

Yang

Wang

2019

Advances in Mechanical Engineering

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Electro-hydraulic servo-valves play key roles in modern electro-hydraulic power systems in many industrial applications. As one of the widely used hydraulic servo-valves, cavitation in the flapper-nozzle servo-valve could produce deleterious effects of noise, flapper vibration and cavitation erosion. In this work, a numerical investigation has been conducted on the manipulation of the flapper-nozzle pilot valve using continuous minijets. Two minijets are symmetrically deployed around the main jet of each nozzle. Vapor fraction and flow forces under the effect of the continuous minijets are compared in detail between the traditional nozzle and the nozzle with the minijets. It is found that cavitation in the flapper-nozzle stage is greatly weakened under the effect of the continuous minijets. The remarkable drop in the radial jet velocity results in the suppression of the swirling structures in the annulus, which may be responsible for the cavitation reduction. The variation trend of the flow forces with the inlet pressure remains unchanged while the magnitude of the flow forces is varied slightly, depending on the various surfaces of the flapper.

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Excitation of Piezoelectrically Actuated Nozzle-Flapper Valve and Its Potential for Fuel Flowmeter Dynamic Calibration

Wang

2020

IEEE/ASME Trans. Mechatron.

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Structural optimization and characteristics analysis of innovative flapper shape in a flapper-nozzle pilot valve

Cited by 3 publications

References 12 publications

Numerical Investigation of Flow Force and Cavitation Phenomenon in the Pilot Stage of Electrical-Hydraulic Servo Valve under Temperature Shock

Numerical Investigation of Flow Force and Cavitation Phenomenon in the Pilot Stage of Electrical-Hydraulic Servo Valve under Temperature Shock

Cavitation and flow forces in the flapper-nozzle stage of a hydraulic servo-valve manipulated by continuous minijets

Excitation of Piezoelectrically Actuated Nozzle-Flapper Valve and Its Potential for Fuel Flowmeter Dynamic Calibration

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