Numerical Study on Sealing Effectiveness with Crossflow Rate Changes with Applied Airfoil Geometry

Junyoung Na; Hee Seung Park; Jeongwon Lee; Hee Jae Lee; Hyung Hee Cho

doi:10.6108/KSPE.2024.28.5.036

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2024 Vol.28, Issue 5 Preview Page Next Page

RESEARCH PAPERS

Numerical Study on Sealing Effectiveness with Crossflow Rate Changes with Applied Airfoil Geometry 에어포일 형상이 적용된 교차유동 유량 변화에 따른 가스터빈 림 씰 기밀 성능 수치해석 연구

31 October 2024. pp. 36-44

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Abstract

The gas turbine rim seal contains gaps induced by the rotating rotor. To prevent the ingress of high-temperature mainstream flow into these gaps, secondary air systems are employed. Various studies conducted to enhance sealing effectiveness by introducing minimal cooling flow. This study investigates the effects of crossflow rate when applying airfoil-shaped geometries through numerical analysis. Rotational Reynolds number of 1.05×10⁶ and crossflow rates(C_w,c) ranging from 4,046 to 12,138. As crossflow rate increased, pressure and sealing effectiveness increased. Compared to configurations without crossflow, a 49.5% improvement was observed in the first-stage seal area, while a 3.2% decrease was noted in the between-seal region.

Keywords

Rim Seal

Ingestion

Sealing Effectiveness

Cross Flow

가스터빈 림 씰은 회전하는 로터에 의해 간극이 존재한다. 간극 내부로 고온의 주 유동이 유입되는 것을 막기 위해 이차 냉각 유로 시스템(Secondary Air System)이 사용되고 있으며, 최소한의 냉각 유량을 추기하여 씰링 효율을 높이기 위해 다양한 연구들이 수행되었다. 본 연구에서는 수치해석을 통해 에어포일 형상이 적용된 교차유동을 설계하였을 경우 교차유동 유량 변화에 따른 영향에 대해 연구하였다. 회전 레이놀즈 수는 1.05×10⁶ 이며, 교차유동의 유량 C_w,c는 4,046 ~ 12,138이다. 교차유동 유량 증가에 따라 압력 및 씰링 효율이 증가가 나타났으며, 교차유동이 없는 형상 대비 1단 씰 영역에서 49.5% 향상과 between seal 영역에서 3.2% 저하가 나타났다.

키워드

림 씰

주 유동 유입

씰링 효율

교차 유동

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Information

Publisher :The Korean Society of Propulsion Engineers
Publisher(Ko) :한국추진공학회
Journal Title :Journal of the Korean Society of Propulsion Engineers
Journal Title(Ko) :한국추진공학회지
Volume : 28
No :5
Pages :36-44
Received Date : 2024-07-22
Revised Date : 2024-09-14
Accepted Date : 2024-09-23
DOI :https://doi.org/10.6108/KSPE.2024.28.5.036

Journal of the Korean Society of Propulsion Engineers ISSN:1226-6027(Print) 2288-4548(Online) 한국추진공학회지

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