基于COMSOL的滑阀流固耦合共轭传热仿真研究

发布时间：2018-05-08 17:20

本文选题：滑阀 + 流固耦合　；参考：《液压与气动》2017年05期

【摘要】：液压滑阀在工作过程中常常因黏性加热而出现阀芯热卡紧现象,基于流固耦合共轭传热方法,运用COMSOL软件对滑阀内的热-流-固多物理耦合场进行数值计算。结果表明:高温主要集中在速度梯度较大的区域以及受高速油液冲刷的节流槽壁面,由此产生的阀芯节流槽区域径向不均匀环状凸起变形可能直接导致阀芯卡紧;阀芯最大径向热变形量可达1.31μm,位于节流槽矩形工作边处;黏温特性对滑阀内的黏性加热效应具有消极的影响,含气泡油液却与此相反,导热率与温度的线性关系对滑阀阀芯径向热变形也具有消极的影响;考虑以上因素并不改变滑阀内的温度场分布与热变形特征,而是使计算结果更加符合实际工况。
[Abstract]:In the working process of hydraulic slide valve, the heat clamping phenomenon of valve core often occurs due to viscous heating. Based on the fluid-solid coupling conjugate heat transfer method, the thermal-fluid-solid multi-physical coupling field in the slide valve is numerically calculated by using COMSOL software. The results show that the high temperature is mainly concentrated in the area with high velocity gradient and the wall of throttling groove washed by high speed oil. The radial inhomogeneous annular bulge deformation in the throttle zone of the valve core may lead to the valve core clamping directly. The maximum radial thermal deformation of the valve core is up to 1.31 渭 m, which is located at the working edge of the rectangular throttling groove. The viscosity and temperature characteristics have a negative effect on the viscous heating effect in the slide valve, but the bubble oil is the opposite. The linear relationship between thermal conductivity and temperature also has a negative effect on radial thermal deformation of the valve core, and the above factors do not change the distribution of temperature field and the characteristics of thermal deformation in the slide valve, but make the calculation results more in line with the actual working conditions.
【作者单位】：兰州理工大学能源与动力工程学院;甘肃省液压气动工程技术研究中心;
【基金】：国家自然科学基金(57515254)
【分类号】：TH137.52

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