Abstract

Solid particles mixed in the oil cause erosion of hydraulic spool valves, and these valves may fail in severe erosion. In this article, with the help of the Euler–Lagrange solver, a numerical model of the solid–liquid two-phase flow is established for the spool valves, in which the standard k-ε model is used for the turbulent flow. With a comparison of seven different erosion models, the E/CRC erosion model is the closest one to the experiment data. Based on the numerical model and the experiment data, an optimized E/CRC erosion model with a new impact angle function for complete round particles is proposed for the spool valves. It is observed that there is better agreement between the optimized model and the experimental values. In addition, the relationships between the erosion rate and the main influencing factors are revealed, including the particle size, particle concentration, differential pressure, flow direction, spool opening, and oil viscosity.

摘要

混入油中的固体颗粒会引起液压滑阀的腐蚀，这些阀在严重腐蚀时可能会失效。在本文中，借助欧拉-拉格朗日求解器，建立了滑阀固液两相流动的数值模型，其中标准k-ε模型用于湍流。通过对七种不同侵蚀模型的比较，E/CRC 侵蚀模型是与实验数据最接近的一种。基于数值模型和实验数据，提出了一种优化的具有完整圆形颗粒冲击角函数的滑阀E/CRC侵蚀模型。可以看出，优化后的模型与实验值具有较好的一致性。此外，揭示了冲刷速率与主要影响因素之间的关系，包括颗粒大小、颗粒浓度、压差、流向、阀芯开度和油粘度。