In order to evaluate the effect of roughness surface and its mechanical deformation on the leakage rate of gasket seal structure, the concept of effective separation height was introduced to characterize the characteristic scale of interface leakage channel. The effective separation height can be achieved by finite element analysis of the mechanical contact deformation of a single rough peak combined with the Roth contact model. The numerical results show that the leakage rate obtained by parabolic roughness is close to the experimental value, and the influence of the roughness angle on the settlement is very small. On the basis of the effective separation height, this paper realizes the theoretical prediction of the leakage rate by combining the rough surface computer generation technology and the numerical simulation of the leakage channel flow. The prediction results are in good agreement with the experimental results. The research of this paper has important guiding significance for the optimization design of the sealing performance of metal gasket.

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