Numerical study of turbine rim seals performance with different sealing structures

IF 0.3 4区工程技术 Q4 ENGINEERING, MULTIDISCIPLINARY

Revista Internacional de Metodos Numericos para Calculo y Diseno en Ingenieria Pub Date : 2022-01-01 DOI:10.23967/j.rimni.2022.09.003

T. Bai, Q. Yang, J. Liu, Y. Shi, S. Qiao

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引用次数: 1

Abstract

The unsteady large-scale vortex near the turbine rim has an important influence on the sealing performance. Characteristics and performance of four sealing structures are researched in this paper. Three-dimensional unsteady numerical simulation was adopted to deeply reveal the characteristics of the rim sealing vortex and its influence mechanism on the rim sealing performance. The results show that the rim seal vortex structure induced by the interaction between ingested gas and sealing flow in the gap is the leading cause of unsteady flow in the rim. The vortex size is suppressed with the increasing seal flow rate or a Chute seal structure. However, the rim seal vortex exit in the cavity gap under a low seal flow rate can suppress the gas intrusion and improve the sealing efficiency of the turbine cavity even with a simple sealing structure. The Chute sealing structure achieves better performance among the four sealing structures studied in this paper. It can achieve complete sealing under a low sealing flow rate of 0.5% and has less impact on the aerodynamic performance of the mainstream even with high sealing flow rate. The research of this paper has guiding significance for further understanding the sealing mechanism and optimizing the design of the sealing structures.

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不同密封结构涡轮轮缘密封性能的数值研究

涡轮边缘附近的非定常大涡对涡轮密封性能有重要影响。本文研究了四种密封结构的特点和性能。采用三维非定常数值模拟方法，深入揭示了轮缘密封涡的特性及其对轮缘密封性能的影响机理。研究结果表明，由吸入气体与间隙内密封流动相互作用而产生的边缘密封涡结构是导致边缘非定常流动的主要原因。增大密封流量或采用斜槽密封结构可以抑制涡流的大小。而在低密封流量条件下，在空腔间隙处的边缘密封涡出口即使采用简单的密封结构也能抑制气体侵入，提高涡轮空腔的密封效率。在本文所研究的四种密封结构中，溜槽密封结构的性能较好。在0.5%的低密封流量下可以实现完全密封，在高密封流量下对主流气动性能影响较小。本文的研究对进一步认识密封机理和优化密封结构设计具有指导意义。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Revista Internacional de Metodos Numericos para Calculo y Diseno en Ingenieria 工程技术-工程：综合

CiteScore

0.70

自引率

0.00%

发文量

审稿时长

6 months

期刊介绍： International Journal of Numerical Methods for Calculation and Design in Engineering (RIMNI) contributes to the spread of theoretical advances and practical applications of numerical methods in engineering and other applied sciences. RIMNI publishes articles written in Spanish, Portuguese and English. The scope of the journal includes mathematical and numerical models of engineering problems, development and application of numerical methods, advances in software, computer design innovations, educational aspects of numerical methods, etc. RIMNI is an essential source of information for scientifics and engineers in numerical methods theory and applications. RIMNI contributes to the interdisciplinar exchange and thus shortens the distance between theoretical developments and practical applications.