Design of a biomorphic groove dry gas seal based on fishtail outlines

摘要

In order to improve the sealing performance of the existing dry gas seal, a fishtail type bionic groove used for end seal is proposed in this paper. The geometric models of fish tail groove are structured and its mathematical models are analyzed. Based on the theory of computational fluid mechanics, the Reynolds equation of gas film between seal faces is established, and the numerical simulation study is carried out by the finite difference method. By using the analysis soft-ANSYS, the influence of the main geometric structure parameters of the fishtail groove on the sealing performance parameters, such as the opening force and the leakage amount, is emphatically analyzed. From the analysis of the simulation results, the optimum geometric structure parameters of the fishtail groove are obtained. The simulation results also show that the fishtail groove has larger opening force and smaller leakage. The overall bearing capacity and the film stiffness are better than those of the classical T groove.