Experimental Study on Flame Behavior and NOx Emission in Counter-Swirl Injector for Gas-turbine Engine

Junpyo Hong; Keeman Lee

doi:10.6108/KSPE.2025.29.5.019

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2025 Vol.29, Issue 5 Preview Page Next Page

RESEARCH PAPERS

Experimental Study on Flame Behavior and NO_x Emission in Counter-Swirl Injector for Gas-turbine Engine 가스터빈용 역선회 인젝터에서 화염거동 및 NO_x 배출특성에 관한 실험적 연구

31 October 2025. pp. 19-28

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Abstract

A study was conducted on flame behavior and NO_x emission characteristics in co-axial counter-swirl injector for gas turbine engine under various inner swirl levels and quarl angles. The study was carried out with a fixed total heat release rate of 5 kW, using global equivalence ratio, hydrogen co-firing ratio, quarl angle, and inner swirl number as key parameters. Five distinct flame shapes were identified based on the global equivalence ratio and hydrogen co-firing ratio. It was observed that the inner swirl number and quarl angle influence the mixing performance between the premixed methane-oxidizer flow through the outer nozzle and the hydrogen flow from the inner nozzle, as well as the recirculation zone, leading to variations in flame behavior and NO_x emissions.

Keywords

Counter-swirl

Hydrogen Co-firing Ratio

Swirl Number

Quarl Angle

Global Equivalence Ratio

동축 역선회 인젝터에서 다양한 내부 선회강도와 Quarl 각도에 따른 화염거동과 NO_x 배출특성에 관한 연구가 수행되었다. 총 열 발생률이 5 kW로 고정된 상태에서 글로벌 당량비, 수소 혼소율, Quarl 각도와 내부 선회수를 주요 변수로 연구를 진행하였다. 글로벌 당량비와 수소 혼소율에 따라 5가지 화염형상이 나타나는 것을 확인하였으며, 내부 선회수와 Quarl 각도는 재순환 영역뿐만 아니라 외부 노즐의 예혼합된 메탄연료와 산화제(공기) 유동과 내부 노즐의 수소연료 유동 간의 혼합성능에 영향을 미쳐 화염거동과 NO_x 배출에 변화를 가져왔다.

키워드

역선회

수소 혼소율

선회수

외부 노즐 출구각도

글로벌 당량비

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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 : 29
No :5
Pages :19-28
Received Date : 2025-03-21
Revised Date : 2025-06-09
Accepted Date : 2025-07-07
DOI :https://doi.org/10.6108/KSPE.2025.29.5.019

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

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