Numerical simulation and parameter optimization of seal property of bidirectional rotating cylinder gas film

Based on cognizing of advantages of cylinder gas film seal system, this paper proposes a new bidirectional rotating cylinder gas film seal system with inverted T interface structure and double-groove interface structure. It establishes mathematical model and numerical analysis model of the bidirectional rotating cylinder gas film with inverted T interface structure and double-groove interface structure based on finite element method. It develops calculation program about pressure distribution, steady and dynamic property of the gas film, and multidimensional parameter optimization of groove structure on the basis of finite element method on the VC platform. It realizes calculation and analysis of pressure distribution, property of the seal system and structural parameter optimization design. It builds physical models and finite element models of the inverted T cylinder gas film with different average thickness in Gambit. And then, this paper carries out numerical simulation of the gas film under different rotational speed through FLUENT. The simulation results of commercial software are consistent with numerical results of the self-developed program, verifying the correctness of the developed program. It calculates and compares steady and dynamic properties of two kinds of interface structures, and seal performance of inverted T type is better than double-groove type under the same design conditions, which provides reference for selection model of seal system. The calculation program of genetic algorithm-particle swarm optimization (GAPSO) has guiding significance for the design of groove parameters.