Abstract
Aluminum alloy spool valve body material is prone to severe wear on the wall under the condition of oil contamination. Aiming at this problem, combined with the theory of liquid-solid two-phase flow and erosion wear, the wear prediction model of aluminum alloy sliding valve wall is established based on computational fluid dynamics, and the effects of turbulence and wall materials, particle size distribution, and particle shape on particle motion are discussed. The calculation of the wear prediction model is done with Fluent software. This study predicts the wear of the wall under actual working conditions and calculates the influence of particle size, particle shape, and pressure difference on the wall wear of the aluminum alloy sliding valve. The research results have certain significance for the maintenance and upkeep of aluminum alloy sliding valve wall, improved design, and life prediction.
Highlights
With the gradual expansion of market demand and advances in material processing and manufacturing technology, the overall structure can reduce the size and weight of the automatic transmission electrohydraulic module [1]. e material of the valve body and the valve core are, respectively, aluminum alloy and alloy steel; the main valve core which plays an important role is directly assembled in the valve hole in the aluminum alloy valve body; and the steel valve sleeve in the conventional electrohydraulic module is no longer needed
In order to facilitate the prediction of the wall wear rate of the aluminum alloy spool under realistic conditions, the wear rate is defined as the mass loss of the wall material per unit area due to particle collision divided by the mass of all particles in the internal flow field, which can be expressed by the following formula: ERm
Before analyzing the wall wear rate, it is necessary to analyze the flow field characteristics and the particle motion characteristics because the loss of the wall material is the result of the movement of the oil and particles in the valve cavity
Summary
With the gradual expansion of market demand and advances in material processing and manufacturing technology, the overall structure can reduce the size and weight of the automatic transmission electrohydraulic module [1]. e material of the valve body and the valve core are, respectively, aluminum alloy and alloy steel; the main valve core which plays an important role is directly assembled in the valve hole in the aluminum alloy valve body; and the steel valve sleeve in the conventional electrohydraulic module is no longer needed. Kun Zhang et al [6] established a performance characteristic degradation model and a life prediction method for the problem of servo valve failure due to the wear of contaminated particles. For the problem that the wall surface is subjected to the particle impact wear, the wear prediction of the aluminum alloy sliding valve wall and the influence of the pollution condition parameters on the wall wear of the aluminum alloy sliding valve are studied. Pressure distribution, and particle trajectory of the oil flow inside the aluminum alloy slide valve, predict the distribution area of the wall wear and the corresponding wear rate, and find out influence of particle size, particle shape, and pressure on the wear of aluminum alloy sliding valve wall. Where Gk represents the enthalpy flow energy term produced by the average velocity gradient; Gb is the turbulent flow energy term due to buoyancy; Cμ, G1ε, and G2ε are the constants, and their values are 0.09, 1.44, and 1.92, respectively; and σk and σε are k and ε, respectively. e turbulent Prandtl number, which takes 1.0 and 1.3, respectively; Sk and Sε are user-defined source items
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