Analysis of pressure oscillation and structural parameters on the performance of deflector jet servo valve

Abdallah, Hazem K.; Peng, Jinghui; Li, Songjing

doi:10.1016/j.aej.2022.11.021

Cited by 11 publications

(2 citation statements)

References 13 publications

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“…In recent years, CFD simulation had been widely used to study cavitation phenomena and erosion wear [11][12][13] . Hazem K. Abdallah [14] has studied the pressure pulsation characteristics in the ow eld of a de ector jet pilot stage by the Large Eddy Simulation(LES) method. Apart from CFD simulation, particle-image-velocimetry (PIV) experiments and mathematical modeling have been conducted to research the pilot-stage ow of the servo valve.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Transient Turbulent Flow in the Pilot Stage of a Deflector Jet Servo Valve

Wu,

Zou

2024

Preprint

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The performance of a deflector jet servo valve is highly affected by the characteristics of the pilot stage flow field. In this paper, the transient results of the large eddy simulation (LES)-based numerical simulation of the pilot stage flow field are presented. The LES results are validated against particle image velocimetry, showing that the LES method can predict the transient turbulent flow. The length of the potential core of the jet assuming from the nozzle and the position of the jet impinging on the V-groove have great relations with the inlet pressure. Traveling cavitation in the deflector begins to appear when the inlet pressure reaches 6 MPa. The increment in inlet pressure enhances cavitation and cavitation shedding. Snapshot proper orthogonal decomposition(snapshot POD) analysis, based on LES, is applied to decompose the instantaneous velocity fluctuation into coherent structures and turbulent velocity components. The relationships between each coherent structure and wall attachment flow, cavitation phenomena, and vortex pairs are discussed. The vortex in Mode 2 contributes to deflecting the jet from the nozzle and causing part of the fluid to flow along the side wall in the V-groove. Through the fast Fourier transform (FFT) result of the POD coefficient, it is known that the traveling cavitation near the side wall of the V-groove is related to Mode 4. This research contributes to the mathematical modeling and improving the stability of the flow field.

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Section: Introductionmentioning

confidence: 99%

Analysis of Transient Turbulent Flow in the Pilot Stage of a Deflector Jet Servo Valve

Wu,

Zou

2024

Preprint

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“…In addition, in order to adapt to the requirements of various industries and improve the working efficiency and voltage regulation characteristics of the valve, much research has been done on its structural design. Abdallah et al [22] studied the relationship between different inlet pressures and pressure oscillation and proposed four solutions to reduce the pressure oscillation of the deflection jet servo valve by structural optimization. Zang et al [23] studied the influence of different inlet diameters on the dynamic characteristics of the pilot valve by using dynamic mesh technology.…”

Section: Introductionmentioning

confidence: 99%

Transient Flow Characteristics of a Pressure Differential Valve with Different Valve Spool Damping Orifice Structures

Zhang

2024

sv-jme

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Lubrication system failure is a significant cause of in-flight shutdown incidents in aviation engines. The pressure differential valve, an essential component of a certain type of aviation engine lubrication system, is responsible for controlling the flow rate and pressure of the lubricating oil. Comprehending the transient flow characteristics of the pressure differential valve is of paramount importance for the secure operation of lubrication systems. This paper establishes a transient flow model of a pressure differential valve based on a transient computational fluid dynamics (CFD) method, and the experimental validation demonstrates the effectiveness of the computational model. The internal flow characteristics of the differential pressure valve at different stages during the opening process were studied. Additionally, four transient lubricating oil flow models with different valve spool damping orifice were established to analyse the impact of damping orifice structure on valve spool movement characteristics, pressure control characteristics, and flow field distribution. The results indicate that when the diameter of the valve spool damping orifice increases from 0.3 mm to 1.0 mm, the valve spool displacement and fluid force increase by 88 % and 20 %, respectively. Meanwhile, the peak valve spool velocity, peak oil supply pressure, and steady-state value decreased by 15 %, 29 %, and 34 %, respectively. As the length of the valve spool damping orifice increases from 0.894 mm to 4.0 mm, the growth rate of valve spool displacement and fluid force gradually decreases, with the peak valve spool velocity decreasing by 7 %. This study has potential significance for the structural optimization and application of pressure differential valve in lubrication systems.

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Numerical Study of Erosion Phenomena with the Presence of Cavitation at Deflector Jet Servo-Valve

Abdallah,

Ben-Mansour,

2023

Arab J Sci Eng

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Analysis of pressure oscillation and structural parameters on the performance of deflector jet servo valve

Cited by 11 publications

References 13 publications

Analysis of Transient Turbulent Flow in the Pilot Stage of a Deflector Jet Servo Valve

Analysis of Transient Turbulent Flow in the Pilot Stage of a Deflector Jet Servo Valve

Transient Flow Characteristics of a Pressure Differential Valve with Different Valve Spool Damping Orifice Structures

Numerical Study of Erosion Phenomena with the Presence of Cavitation at Deflector Jet Servo-Valve

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