Modeling Research on Characteristics of Two Types of Thermal Instability for Rotary Seal

doi:10.3901/JME.2019.09.055

Abstract

Abstract: Thermal instability phenomenon on the sealing ring in the transmission of vehicle is obvious. In order to obtain the formation rules and influence mechanisms of the thermal instability, the modeling calculations and experiments are conducted for different sealing materials. According to the thermal instability characteristics of the sealing ring, the models of local hot bandings and hot spots are built respectively. Based on the Galerkin finite element method, the thermal-structural coupling model is built, and the equations of non-uniform physical fields and their perturbations are transformed into the determinants of matrixes and calculated. The critical speeds of the thermal instability are obtained. The critical speeds of the thermal instability decrease with the increase of the frictional coefficient. Experimental investigations are performed in the sealing performance test rig. A test verification method for local hot banding and hot spot is proposed to investigate the thermal instability for the polyimide and copper-base powder metallurgy sealing materials. The test results are consistent with the calculated results. The scanning electron microscopy is utilized to examine the surface morphology of the sealing rings after the tests, which agrees well with the characteristics of hot bandings and hot spots. The numerical and experimental results indicate the effectiveness of the thermal instability model of sealing rings.

Key words: hot banding, hot spot, sealing ring, thermal instability

CLC Number:

TH117

GONG Ran, CHENG Zhigao, XU Yi, ZHANG Yudong, ZHANG He. Modeling Research on Characteristics of Two Types of Thermal Instability for Rotary Seal[J]. Journal of Mechanical Engineering, 2019, 55(9): 55-62.

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