Abstract: Aiming at the problem of the large amount of frictional heat generated during the sealing process of the brush seal will affect its sealing performance, the influence of the static pressure ratio of the inlet and outlet and the structure of the back plate on the heat transfer characteristics of the brush seal was numerically studied. Firstly, a threedimensional thermal analysis model of brush seal was established by ANSYS software, and the rationality of the model was verified by comparing with experimental data. Then, the influence of inlet and outlet static pressure ratio on the leakage of brush seal and the maximum temperature of brush seal was studied, and the distribution of pressure field and flow field of brush seal was analyzed. Finally, on the basis of thermal analysis, the distribution of the temperature field of the brush seal was simulated and analyzed. By changing the cavity shape, the depth and the downstream protection height of the balance cavity of the back plate, the influence law of the structure of the back plate on the temperature field of the brush seal was studied. The results show that with the increase of the inlet and outlet static pressure ratio, the leakage’s and the maximum temperature’s change trend of the brush seal gradually become slow down. The change of the shape of balance cavity has a limited impact on the maximum temperature of the brush seal. The maximum temperature of the brush seal increases with the depth of the balance cavity increases, and the downward trend becomes slower. When the downstream protection height lower than 1.2mm, with the downstream protection height decreases, the position of the highest temperature will shift from the tip of the last row of bristles to the front rows, and the value of it increases exponentially.

Key words:  brush seal; heat transfer characteristics;flow-heat coupling; temperature field; frictional heat flow;leakage

YANG Jing-yao, LIU Mei-hong, SONG Xiao-lei, et al. Numerical study on heat transfer characteristics of brush seal［J］.Journal of Mechanical & Electrical Engineering, 2021,38(10):1230-1237.