【摘要】 非对称表面微织构虽被证明在理想状态下能够提高机械零件的承载能力,但由于非对称表面微织构形貌对零件表面间润滑油流动状态影响更为复杂,加之空化与惯性效应耦合作用,故非对称表面微织构对零件表面承载能力的影响仍不是很清楚,这限制了探寻提高机械零件承载能力的有效途径。基于Navier-Stokes方程和Schnerr-Sauer方法,考虑空化与惯性效应耦合作用,通过CFD数值方法分析了非对称表面微织构滑块轴承承载力及微织构凹坑内润滑油流动特性,以尝试补足这方面研究的空缺。分析结果表明,非对称微织构构型在空化与惯性耦合作用下对滑块承载力影响存在差异,最佳的非对称表面微织构可增强微织构的惯性效应从而提高滑块承载力;当表面微织构滑块运动速度大于10 m/s时,空化与惯性耦合效应影响更为显著,但空化与惯性效应呈现出相反的影响趋势。文章进行的空化与惯性效应耦合作用下的非对称表面微织构承载力研究不仅更为贴近实际工程,而且揭示和探讨了表面微织构型、工况条件和空化与惯性耦合效应对零件承载力影响的关系。更多还原

【Abstract】 It has been authenticated that asymmetric surface textures can enhance load-carrying capacity of mechanical parts in ideal status. However,influence on mechanical load-carrying capacity of coupling effects of cavitation and inertia under complicated states of oil flow is a subject remaining to be researched. It makes against finding a new method of improve mechanical load-carrying capacity. This paper adopts Navier-Stokes equation and SchnerrSauer method to study load-carrying capacity of slider with asymmetric surface textures and properties of oil flow under coupling effects of cavitation and inertia. The results show that effects on loading-carrying capacity of slider with different asymmetric surface textures are different. Optimal asymmetric surface texture can enhance inertia of dimples so that load-carrying capacity improves. When the speed of slider is greater than 10 m/s,coupling effects of cavitation and inertia are more significant. In addition,the effects on load-carrying capacity of cavitation and inertia are opposite. The study not only accords with engineering,but also reveals the effects on load-carrying capacity with different asymmetric surface textures under coupling effects of cavitation and inertia.更多还原