中文摘要：

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。

英文摘要：

In order to improve the core lubrication characteristics of a water hydraulic valve, a new method has been proposed involving the use of a regular distribution of micro-texture morphology on the core surface. The influ- ence of the micro-topography on the lubrication and leakage characteristics of the micro-texture valve core has been analyzed in detail. The geometric and related mathematical models have been established, and the CFD method based on the Navier-Stokes equation for flow field calculations has been employed. The results show that the micro- texture hydrodynamic lubrication is highly affected by the micro-topography, and different micro-topographies lead to differences in the pressure distribution and bearing force. A suitable core micro-texture morphology can produce a liquid film pressure support and effectively improve the lubrication characteristics of the valve core, except in the case of a triangular shape. A sphere gives the minimum shear friction and leakage. When the area ratio is 36% , the leakage decreases by nearly 7.5% relative to other morphologies, and the shear friction decreases by about 36.5%. Furthermore, a sphere has the advantages of more convenient processing and giving a larger limiting area ratio in the same micro-unit. Thus it can be seen, the sphere morphology affords a good comprehensive performance at high area ratio