基于栅格渗漏模型的静密封界面状态演变特性研究

On the Phase Transition Characteristic of Static Sealing Interface Based on Lattice Leakage Model

由于密封界面微观形貌的复杂性,静密封机理及其状态演变一直以来是个难题。在对密封界面进行离散和近似的基础上,提出一种基于栅格渗漏模型的静密封界面渗漏状态预测模型。给出栅格渗漏模型的构建方法,在此基础上通过大量数值试验对密封-渗漏状态演变特性进行了分析,进而建立了静密封界面状态演变曲线的数学模型,发现渗漏发生的概率在与系统相关的阈值附近呈现急转的规律,同时研究表明静密封界面的接触面积、表面纹理方向等对密封界面的状态演变特性有显著影响。结合逾渗理论和试验数据,讨论所提出模型及所发现规律的通用性。

Sealing mechanism and its transition are not well understood due to the complexity of sealing interface in the micro-scale. A lattice based static sealing predicting model is presented by discretizing and approximating the sealing interface in order to reveal the sealing mechanism. The method of building lattice leakage model is given, the phase transition in sealing interface is researched by carrying out large numbers of numerical experiments based on this model, and meanwhile the mathematical model is obtained by curve fitting the cumulated distributed function. The results show probability of leaking takes on the steep transition around system-related threshold, and the phase transition of the sealing interface is influenced by the size of model and orientation of surface texture. At last the generality of the presented model is discussed by combining with percolation theory and experimental data.