Frictional heat analysis of bearing cavity ring-shaped floating ring seal

WANG Jia-xing1, LI Shuang-xi1, MA Wen-jie2, FENG Rui-peng1, LIU Zhi-wei1
(1.Research Center for Fluid Sealing Technology, Beijing University of Chemical Technology,
Beijing 100029, China; 2.Beijing Aerospace Propulsion Institute, Beijing 100076, China)

Abstract: Aiming at the problem of frictional heat generation under high speed and variable pressure difference in the bearing cavity of an aeroengine, the main parameters of the ringlobe floating ring seal were studied. ANSYS finite element software was used to apply the frictional heat of seal under boundary conditions to establish a thermal model. Based on Fluent, a runway cooling fluid-solid-heat coupling model was established. The temperature change of the runway under different blocking gas temperature and cooling oil flow was studied. The temperature distribution and cooling oil cooling effect were simulated, and the main factors affecting the heating of the seal were obtained. The results indicate that the frictional heating of the seal will cause the local temperature to be too high, causing uneven thermal stress to cause deformation of the sealing surface and increase the amount of leakage. The pressure difference and speed will have a great impact on the frictional heating of the seal. The sealing pressure should be reduced by reducing the closing pressure. There is a limit to the cooling effect of the coolant and the heat generation of the runway. Continued increase in fuel supply will not increase the cooling effect of the runway.The research provides a reference for the friction process of the bearing cavity ring flap floating ring seal.
Key words: ring flap floating ring seal; frictional fever; finite element analysis; structural optimization