Effect of Inflow Swirl on the Sealing Effectiveness of Turbine Rim Seal

作者：Qingfeng Cong, Long Lei, Kaiyuan Zhang, Zhigang Li, Jun Li · 年份：2023 · DOI：10.1115/gt2023-102768 · 被引用次数：6 · 研究领域：Tribology and Lubrication Engineering、Turbomachinery Performance and Optimization、Combustion and flame dynamics

Abstract Turbine inlet swirl condition is inherently present at the combustion chamber outlet and has an important influence on mainstream flow and gas ingestion. The sealing effectiveness and ingestion mechanism were numerically investigated using Unsteady Reynolds-Averaged Navier-Stokes (URANS) equations coupled with a fully developed shear stress transport (SST) turbulent model. Mass transfer analogy is utilized to simulate the hot gas ingestion and sealant egress by seeding CO2 into the air as a tracer gas. Simulations with mainstream inflow swirls of 0°, ±10°, ±20° were conducted and compared. Computational results indicate that at the same sealant flow rate, the sealing effectiveness increases significantly with the increase in the incidence angle at the leading edge of stationary vanes. When the non-dimensional sealant rate is 0.02415 and the incidence angle is increased from 0° to +10° and +20°, the sealing effectiveness at r/b = 0.958 on stationary disk is increased by 3.39% and 13.26%, respectively. The area-averaged sealing effectiveness of +20° incidence angles at the stationary and rotating disk can be increased by 12.02% and 5.19%, compared with the 0° incidence angle. The incidence angle near the vane leading edge affects the formation position of the horseshoe vortex, and ultimately affects the passage vortex. Therefore, the flow field in the rim seal clearance changes greatly. From axial and radial perspectives, the vortex due to Kelvin Helmholtz instability ...