Abstract: Aiming at the new type of cylindrical gas film seal with reverse herringbone groove on the side of rotating shaft sleeve, the mathematical model of cylindrical gas film seal was established and the pressure distribution of reverse herringbone groove gas film was numerically solved by finite difference method. Through the Isight platform integrated with MATLAB software, the optimal Latin hypercube test design and its post-processing module were used to extract the key groove structure parameters affecting the sealing performance parameters. An approximate model was established instead of time-consuming numerical calculation, and the multi-objective optimization of groove structure parameters was carried out by integrating the NSGA-Ⅱ multi-objective optimization algorithm, which provided theoretical reference for the multi-objective optimization design of groove type for cylindrical gas film seal slotted on the side of shaft sleeve.

Key words: cylindrical gas seal, reverse herringbone groove, approximate model, optimization design