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Journal of Thermal Science

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2023 , Vol. 32 >Issue 1: 366 - 386

DOI: https://doi.org/10.1007/s11630-022-1739-x

气动

Effects of Sealing Flow Supply Configuration with Holes on Sealing Effectiveness of Turbine Rim Seal

  • GAI Zepeng ,
  • ZHU Pengfei ,
  • HU Jianping ,
  • LIU Zhenxia ,
  • YIN Hang
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  • School of Power and Energy, Northwestern Polytechnical University, Xi’an 710072, China

网络出版日期: 2023-11-28

基金资助

This research work is supported by the Special Scientific Research Project of the Ministry of Industry and Information Technology (MJ-2018-D-21) and the National Science and Technology Major Project (J2019-III-0003-0046). The authors gratefully acknowledge the high-performance computing services provided by the Institute of Power Mechanical Internal Flow Systems, Northwestern Polytechnical University.

版权

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2022
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Effects of Sealing Flow Supply Configuration with Holes on Sealing Effectiveness of Turbine Rim Seal

  • GAI Zepeng ,
  • ZHU Pengfei ,
  • HU Jianping ,
  • LIU Zhenxia ,
  • YIN Hang
Expand
  • School of Power and Energy, Northwestern Polytechnical University, Xi’an 710072, China

Online published: 2023-11-28

Supported by

This research work is supported by the Special Scientific Research Project of the Ministry of Industry and Information Technology (MJ-2018-D-21) and the National Science and Technology Major Project (J2019-III-0003-0046). The authors gratefully acknowledge the high-performance computing services provided by the Institute of Power Mechanical Internal Flow Systems, Northwestern Polytechnical University.

Copyright

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2022
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摘要

本文在传统径向轮缘密封的基础上，提出了一种新型带密封孔的轮缘密封结构，并对传统的供封严气结构和新型带密封孔的供封严气结构在不同封严气流量下的密封性能进行了数值比较。通过使用URANS方法和ANSYS CFX的SST湍流模型，对轮缘密封的密封效果和非定常流场进行了数值模拟。研究得到了不同封严气流量对新型密封流供气结构的密封效果的影响，同时还研究了不同封严气流量工况下传统轮缘密封的密封效率和非定常流动特性。对于传统的径向轮缘密封，封严气流量的增加降低了轮缘间隙处主流效应所引起的燃气入侵程度，并且非定常流动特性增强，流场内的低频信号的数量和幅值有所增加。Kelvin-Helmholtz不稳定性涡结构的位置因封严气流量的增加而被抬升，并且其强度被抑制。与传统的密封流供气结构相比，在封严流量为Cw=2000并且封严气分配比例为m1:m2=3:1时，带密封孔的供封严气结构的封严效率最多降低了5.06%；而在封严流量Cw=7500并且封严气分配比例为m1:m2=1:1时，封严效率最多可以提高11.71%。研究表明，在封严流量为Cw=2000工况下，来自密封孔的侧向射流诱导产生更大尺度的Kelvin-Helmholtz不稳定性涡结构，从而使燃气入侵程度加剧，轮毂空间的密封效率降低；在封严流量为Cw=7500工况下，带密封孔的供封严气结构明显抑制了Kelvin-Helmholtz不稳定性涡结构的尺度大小，这对提高传统径向轮缘密封的密封效果是有益的。

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

本文引用格式

GAI Zepeng , ZHU Pengfei , HU Jianping , LIU Zhenxia , YIN Hang . Effects of Sealing Flow Supply Configuration with Holes on Sealing Effectiveness of Turbine Rim Seal[J]. 热科学学报, 2023 , 32(1) : 366 -386 . DOI: 10.1007/s11630-022-1739-x

Abstract

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 rates. The sealing effectiveness and unsteady flow yields at the rim seal are numerically simulated by using the URANS method and SST turbulent model from ANSYS CFX. The influence of the new sealing flow supply configuration on the sealing effectiveness at different sealing flow rates is determined. The effectiveness of different sealing flow rates in the conventional rim seal is also studied. As 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 increase. The position of the Kelvin-Helmholtz instabilities vortex structures is left by the increased sealing flow rate, and its strength is suppressed. Compared 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 m1:m2=3:1 when Cw=2000, and improve the sealing efficiency by 11.71% at most at sealing flow distribution m1:m2=1:1 when Cw=7500. It 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 reduced. However, 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.

Key words： secondary air system; rim seal; ingestion and seal; unsteady flow; discrete sealing holes

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