Solid-liquid flow characteristics and sticking-force analysis of valve-core fitting clearance  

作　　者：Jin-yuan QIAN Jiaxiang XU Fengping ZHONG Zhenhao LIN Tingfeng HUA Zhijiang JIN 

机构地区：[1]Institute of Process Equipment,College of Energy Engineering,Zhejiang University,Hangzhou 310027,China [2]Zhejiang Academy of Special Equipment Science,Hangzhou 310009,China [3]Institute of Wenzhou,Zhejiang University,Wenzhou 325036,China

出　　处：《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》2023年第12期1096-1105,共10页浙江大学学报（英文版）A辑（应用物理与工程）

基　　金：supported by the National Key Research and Development Program of China(No.2021YFB2011300);the National Natural Science Foundation of China(No.52175067).

摘　　要：External contamination particles or wear particles corroded by a valve body are mixed into the fluid. As a result, when the fluid enters the fitting clearance of the valve core, it can cause an increase in resistance and lead to sticking failure of the valve core. This paper analyzes solid-liquid flow characteristics in fitting clearances and valve-core sticking based on the Euler-Euler model, using a typical hydraulic valve as an example. The impact of particle concentration and diameter on flow characteristics and valve-core sticking force was analyzed. The highest volume fraction of particles was in the pressureequalizing groove(PEG), with peak values increasing as the particle diameter increased. The sticking force increased with increasing particle concentration. When the particle diameter was 12 μm, the sticking force was the largest, making this the sensitive particle diameter. Particle distribution and valve-core sticking force were compared for oval, rectangular, and triangular PEGs. The fluid-deflection angles in oval and rectangular PEGs were larger, and their values were 32.83° and 39.15°, respectively. The fluid-deflection angle in the triangular PEG was relatively small, less than 50% that of the oval or rectangular PEGs. The particle-volume-fraction peaks in oval, rectangular, and triangular PEGs were 0.0317, 0.0316, and 0.0312, respectively. The sticking forces of oval, rectangular, and triangular PEGs were 4.796, 4.802, and 4.757 N, respectively when the particle diameter was 12 μm. This work provides a reference for design and research aimed at reducing valve-core sticking.

关 键 词：Solid-liquid flow characteristics Valve core Sticking force Euler-Euler model 

分 类 号：O35[理学—流体力学]