Study on the Characteristics of Pre-Swirl System with Radial Receiver-Holes

Hyungyu Lee; Hyojun Yang; Jongseon Kim; Geonhwan Cho

doi:10.6108/KSPE.2024.28.5.061

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2024 Vol.28, Issue 5 Preview Page Next Page

TECHNICAL PAPERS

Study on the Characteristics of Pre-Swirl System with Radial Receiver-Holes 반경방향 리시버홀을 포함한 프리스월 시스템 특성 연구

31 October 2024. pp. 61-68

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Abstract

Through the CFD analysis, this paper studied the characteristics of swirl angles in a pre-swirl system, which includes radial receiver-holes. This research investigated the effect by varying only the swirl angle while maintaining throat area, and boundary conditions, and compared the design factors such as swirl ratio, discharge coefficient, and total temperature drop effectiveness. As the swirl angle increased within the range of 20 to 80 degrees, the swirl ratio at the nozzle exit decreased. Conversely, at the receiver-hole exit and the system exit, both increasing and decreasing trends in the swirl ratio were observed. Both the discharge coefficient of nozzle and total system increased as the swirl angle increased, however, at lower swirl angles, there was a difference in two discharge coefficients due to losses at the receiver-holes. The total temperature drop effectiveness decreased as the swirl angle increased. Through the results, this study proposed a suitable design swirl ratio range according to the design requirements of pressure and temperature for cooling the blades.

Keywords

Gas Turbine

Secondary Air System

Pre-Swirl System

Computational Fluid Dynamics

반경방향 리시버홀을 포함하는 프리스월 시스템의 스월각에 따른 특성을 전산유체역학 해석을 통해 확인했다. 프리스월러의 목면적과 경계조건은 일정한 상태에서 스월각만 변화시키며 그 영향을 파악했으며, 설계인자인 스월비, 유량계수, 전온도 강하 효율을 비교했다. 스월각 20°-80° 범위에서 스월각이 증가함에 따라 노즐 출구에서의 스월비는 감소했고, 리시버홀 출구에서의 스월비는 증가와 감소 경향 모두 보였으며, 프리스월 시스템 출구에서도 동일한 경향이었으나 그 값은 모두 0.5 이하였다. 노즐에서의 유량계수와 전체 유량계수는 스월각이 증가함에 따라 증가했으며, 낮은 스월각일 때 리시버홀에서의 손실로 인해 두 유량계수의 차이가 있었다. 전온도 강하효율은 스월각이 증가함에 따라 감소했다. 본 연구를 통해 블레이드 냉각을 위한 냉각공기의 목표 전압력, 전온도에 따라 적합한 설계 스월비 범위를 제시했다.

키워드

가스터빈

이차유로

프리스월 시스템

전산유체역학

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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 :61-68
Received Date : 2024-06-11
Revised Date : 2024-08-19
Accepted Date : 2024-08-24
DOI :https://doi.org/10.6108/KSPE.2024.28.5.061

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

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