形貌特征对微造型阀芯润滑及泄漏特性的影响

发布时间：2018-06-12 00:37

本文选题：形貌特征 + 微造型　；参考：《北京化工大学学报(自然科学版)》2016年01期

【摘要】：提出一种在煤矿水压阀阀芯表面加工规律分布的微造型形貌以改善阀芯润滑性能的方法,并着重分析其形貌特征对阀芯润滑及泄漏特性的影响。建立了相关几何及数学模型,并采用基于N-S方程的计算流体力学(CFD)进行数值求解。求解结果表明:微造型动压润滑性能受微观形貌影响大,不同形貌下的压力分布状况及承载力大小不同;合适的阀芯微造型形貌能有效改善阀芯的润滑性能,且除三角形外其他形貌均能产生液膜动压支撑;球冠形具有最小的剪切摩擦力和泄漏量,在面积率为36%时,泄漏量相对于其他形貌下降近7.5%,剪切摩擦力减小约36.5%。同时球冠形形貌加工方便,具有较大的极限面积率,因此可选用面积率较高的球冠形形貌以改善微造型阀芯的润滑及泄漏特性。
[Abstract]:In order to improve the lubricating performance of the valve core, a new method is proposed to improve the lubricating performance of the valve core, and the influence of its morphology on the lubrication and leakage characteristics of the valve core is analyzed. The related geometric and mathematical models are established and solved numerically by using CFDs based on N-S equation. The results show that the hydrodynamic lubrication performance of micro-molding is greatly affected by micro-morphology, and the pressure distribution and bearing capacity are different under different morphologies, and the suitable micro-shape of valve core can effectively improve the lubrication performance of the valve core. The spherical crown has the smallest shear friction force and leakage volume. When the area ratio is 36, the leakage rate decreases by 7.5% and the shear friction decreases about 36.5%. At the same time, the spherical crown shape is easy to process and has a large limit area ratio. Therefore, the spherical crown shape with higher area ratio can be used to improve the lubrication and leakage characteristics of the microshaped valve core.
【作者单位】：安徽理工大学机械工程学院;合肥南车轨道交通车辆有限公司技术工程部;
【基金】：流体动力与机电系统国家重点实验室开放基金(GZKF-201205) 安徽省科技计划(1301022074) 国家自然基金(51205002)
【分类号】：TD40

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