液压冲击器流场分析

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振动与冲击 ›› 2012, Vol. 31 ›› Issue (12) : 73-78.

论文

液压冲击器流场分析

马富银, 杨国平, 吴伟蔚

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Analysis of Fluid Domain in Hydraulic Impactor

MA Fu-yin, YANG Guo-ping, WU Wei-wei

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文章历史 +

摘要

通过流体力学的相关理论分析了压力反馈式液压冲击器的整体流场，建立了液压冲击器流场的基本方程；对冲击器的力学模型进行了简化，并求解了流场中的速度分布和流动损失情况。为了形象地得出冲击器流场的参数变化规律，文章利用Catia软件和Fluent的前处理器Gambit对冲击器的流场进行了建模，并利用Fluent软件对液压冲击器的瞬态流场进行了模拟求解。对比CFD模拟的结果和求解基本方程的结果，结果比较吻合。对瞬态流场的分析表明，在进油口截面突然变化的部位流速变化较大，远离这一区域后开始趋于平稳，而冲击过程中的中腔出油口存在速度较大的区域。另外，随着进油速度增大，流场的紊流情况加剧，流动的损失量呈抛物线增加。

Abstract

Flow field in hydraulic pressure feedback impactor was analysis in this paper by theoretical of Hydromechanics. Differential equations of motion and basic flow equations of hydraulic impactor were built and Mechanical model was simplified. Velocities of fluid and flow losses were solved, too. For contrast and image to draw the parameters of the impact of flow field variation, flow model of impactor was built used by Catia software and Gambit software, and simulated by Fluent software. The result was consistent when comparison of CFD simulation results and the results of solving the basic equation. The results shows that the velocity changed largely at inlet field and became steady away this field. However, at center outflow field there are large velocity field exist. In addition, unsteady flow field became larger and losses increasing as parabola formula with the increasing of velocities.