Effects of throttle groove on viscous heating and thermal deformation of spool valve core

作者：Ling-feng Hang, An-qi Guan, Xiang Lin Gu, Zhen-hao Lin, Ping Liu, Zhi-jiang Jin, Jin-yuan Qian · 发表于：Aerospace Science and Technology · 年份：2025 · DOI：10.1016/j.ast.2025.110744 · 被引用次数：4 · 研究领域：Hydraulic and Pneumatic Systems、Engineering Applied Research、Engineering Structural Analysis Methods

• A new approach is proposed to investigate the causes of valve core sticking in spool valves from the perspective of viscous heating. • Three typical throttle grooves in engineering are investigated and compared. • The entropy generation and temperature rise caused by the throttle effect is investigated. • Solid thermal deformation is calculated based on the temperature distribution in the flow field. The spool valve regulates pressure and flow by means of the throttle groove on the valve core. High-viscosity fluid, such as oil, results in a non-uniform temperature distribution when flowing through the throttle groove. A valve core within this non-uniform temperature will exhibit non-uniform deformation. This change tends to reduce the clearance between the moving parts in the valve, which may lead to the valve core sticking. Therefore, the viscous heating and thermal deformation within the valve is of significant importance. To investigate the mechanisms of viscous heating and valve core thermal deformation, this study establishes a thermal-fluid-solid coupling model. Based on this coupling model, the energy dissipation, viscous heating, and thermal deformation within the valve were analyzed. Three typical throttle grooves (V-type, C-type, and K-type) were specifically investigated. The results indicate that the V-type throttle groove demonstrates the best throttle performance, along with minimal and highly uniform thermal deformation. For spool valves operating in high-vis...