Mechanical Seal Performance of Rough Surface Influenced by Tilt

Abstract

Abstract: According to the actual operating conditions of mechanical seal used in aviation pumps, a theoretical model of hydrodynamic and mixed lubrication conditions was developed for mechanical seal with rough and tilted surfaces. The model considered elasticplastic contact between rough surfaces, and the JakobssonFlobergOlsson (JFO) cavitation boundary condition of mass conservation in lubrication film. Finite element method was used to solve the Patir and Cheng average Reynolds equation, and the fluid film pressure distribution between seal surfaces was obtained. The influence of the nondimensional tilt angle on the seal performance was analyzed under different values of sealed pressure, central film thickness and rotational speed. A performance comparison between rough and smooth surfaces was conducted with a mechanical seal. The results showed that with increasing tilt angle, the load carrying capacity and the leakage rate increased, the friction force decreased firstly and then increased. The mechanical seal with rough surfaces had better performance than that with smooth surfaces when one of seal surfaces had a small tilt angle.

Key words: aviation pump, mechanical seal, tilt, rough surface, cavitation

CLC Number:

TH 117.2

YANG Xiao,PENG Xudong,MENG Xiangkai,WANG Yuming. Mechanical Seal Performance of Rough Surface Influenced by Tilt[J]. Journal of Shanghai Jiaotong University, 2017, 51(6): 748-755.

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