Study on the high-pressure hydrogen gas flow characteristics of the needle valve with different spool shapes

Ye, Jianjun; Cui, Jianlei; Hua, Zhengli; Xie, Junlong; Peng, Wenzhu; Wang, Wei

doi:10.1016/j.ijhydene.2022.04.073

Cited by 24 publications

(4 citation statements)

References 29 publications

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“…The results show that the hydrodynamic compensation effect of the valve core increases with the increase of the opening degree under the optimal size. Ye et al [27] established a CFD model of a high-pressure hydrogen needle valve and studied the influence of valve spool shape on the performance and flow characteristics of the valve. The results show that changing the shape of the valve spool to make it have a larger flow area at a small opening can make the high-pressure hydrogen valve have a better flow field distribution.…”

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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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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“…They are mostly composed of a valve body, a solenoid coil, a locking nut, a valve housing, a spring, a plunger, an orifice, and a needle valve (also called solenoid valve stem) [4]. The solenoid valve stem or needle valve plays an important role in high-pressure hydrogen flow in solenoid valves [5,6]. It directly affects the flow characteristics of hydrogen in the valve and contributes to the working performance and safety of the high-pressure hydrogen valve [7,8].…”

Section: Introductionmentioning

confidence: 99%

Surface Polishing of an Inconel 625 Bar by a Super-Fast MAF Process for a Solenoid Valve Stem Used in a Hydrogen Tank

Kim,

Heng,

Mun

2024

Metals

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This study explores a super-fast magnetic abrasive finishing (MAF) process for polishing the surface of an Inconel 625 bar workpiece for a hydrogen solenoid valve stem. The Inconel 625 bar was chosen to replace the existing STS 316 bar material, previously used for a hydrogen solenoid valve stem. The cylindrical surface of Inconel 625 bars was polished by a super-fast MAF process with high rotational speeds of 1000, 5000, 15,000, and 25,000 RPM and a super-strong magnetic field of 550 mT. The polishing characteristics of this process were evaluated according to the type of abrasives, rotational speeds of the workpiece and processing time. As a result, a super-smooth Inconel 625 bar was successfully achieved, with a surface roughness (Ra) reduced from 0.31 μm to 0.02 μm under the optimal conditions (15,000 RPM, CNT particles (0.04 μm), PCD diamond abrasive (1 μm), Fe (#200), 0.5 g of light oil, and 16 min of processing time). Also, the Ansys analysis results showed suitable strain, equivalent stress, and safety factor of the Inconel 625 bar. This confirmed that, after a super-fast MAF process, an Inconel 625 bar is feasible for application in Hydrogen (H2) tanks instead of a conventional STS 316 bar.

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“…Moreover, Liu et al [23] demonstrated that triangular rib tubes have lower pressure loss than square pipes. Ye et al [24] found that there was a sudden change in pressure around the valve spool in the needle valve due to the flow direction changing suddenly. In summary, pressure drops are related to the velocity and temperature of the fluid and the structure of the flow channel, influencing the performance of the whole system.…”

Section: Introductionmentioning

confidence: 99%

“…Zhang et al [28] changed the spacing, slot width, and depth of each trench to decrease flow resistance in a bionic valve. To reduce the pressure loss in spool valves and needle valves, Okhotnikov et al [9] and Ye et al [24] reduced the areas of pipe corners and sections where cross-sectional flow areas changed suddenly by changing their shapes to circular arcs. However, the abovementioned studies related to heat transfer loss and pressure loss mainly focused on traditional valves, and knowledge on the basic flow characteristics of multiway valves is still insufficient.…”

Section: Introductionmentioning

confidence: 99%

Flow Loss Analysis and Structural Optimization of Multiway Valves for Integrated Thermal Management Systems in Electric Vehicles

Zheng

Wei

2023

Energies

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The multiway valve is the core component of the integrated thermal management system in an electric vehicle, and its heat transfer loss and pressure loss significantly impact the performance of the whole thermal management system. In this paper, heat transfer loss and pressure loss in multiway valves are investigated using three-dimensional unsteady numerical simulations. Heat transfer loss and pressure loss under different operating modes are revealed, and relationships between pressure loss and mass flow rate, inlet temperature, and valve materials are studied. The results show that the significant temperature gradient around the control shaft results in heat transfer loss and pressure loss mainly occurs around the junction of the control shaft and the shell, where the flow direction changes sharply. The pressure loss is nonlinearly and positively correlated with the mass flow rate. Furthermore, the main geometric parameters of the pipeline and the control shaft are optimized. The pressure loss firstly increases and then decreases, with the increasing curvature of the inner walls of the pipe corners in four flow channels. Compared with the structural optimization at the pipe corners, increasing the curvature of the inner wall of the control shaft and the shell corners reduces pressure loss continuously. Moreover, this study obtains an optimal structure with minimum pressure loss using coupled structure optimization at the control shaft and shell corners.

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Study on the high-pressure hydrogen gas flow characteristics of the needle valve with different spool shapes

Cited by 24 publications

References 29 publications

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

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

Surface Polishing of an Inconel 625 Bar by a Super-Fast MAF Process for a Solenoid Valve Stem Used in a Hydrogen Tank

Flow Loss Analysis and Structural Optimization of Multiway Valves for Integrated Thermal Management Systems in Electric Vehicles

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