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Effects of sealing Flow Supply Configuration with Holes on sealing Effectiveness of Turbine Rim seal

Journal of Thermal Science 2023年第1期32卷 366-386页

作者： GAI Zepeng ZHU Pengfei HU Jianping LIU Zhenxia YIN Hang School of Power and Energy Northwestern Polytechnical UniversityXi'an 710072China

This paper proposes a new-designed rim seal configuration with sealing holes based on the conventional radial rim seal,and presents a numerical comparison of the sealing performance between the conventional sealing flow supply configuration and the new sealing flow supply configuration with holes at different sealing flow *** sealing effectiveness and unsteady flow yields at the rim seal are numerically simulated by using the URANS method and SST turbulent model from ANSYS *** influence of the new sealing flow supply configuration on the sealing effectiveness at different sealing flow rates is *** effectiveness of different sealing flow rates in the conventional rim seal is also *** to the conventional rim seal,the increase in the sealing flow rate reduces the degree of gas ingestion induced by the effect of mainstream ingress at the rim clearance,while the unsteady flow characteristics are enhanced,and the number and amplitude of the low-frequency signals *** position of the Kelvin-Helmholtz instabilities vortex structures is left by the increased sealing flow rate,and its strength is *** with the conventional rim seal configuration,the new sealing flow supply configuration with holes could reduce the sealing efficiency by 5.06%at most at sealing flow distribution m_(1):m_(2)=3:1 when Cw=2000,and improve the sealing efficiency by 11.71%at most at sealing flow distribution m_(1):m_(2)=1:1 when Cw=*** shows that the lateral jet from the holes induces a larger-scale Kelvin-Helmholtz vortex structure at Cw=2000,thus the sealing efficiency in the wheel space is also ***,the size of the Kelvin-Helmholtz vortex structures is significantly suppressed by the new sealing flow supply configuration at Cw=7500,which is beneficial to improving the sealing effectiveness of the conventional rim seal.

关键词： secondary air system rim seal ingestion and seal unsteady flow discrete sealing holes

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