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    국내학술지 제목 게시판 내용
    제목(국문)
    제목(영문) Dynamic Characteristics of a Coaxial Jet-Swirl Injector with External Excitation
    저자 배진현 (Jinhyun Bae ,서울대학교 기계항공공학부 ) ▷공저자네트워크등록하기
    김태성 (Taesung Kim ,서울대학교 기계항공공학부 ) ▷공저자네트워크등록하기
    정석규 (Seokgyu Jeong ,서울대학교 기계공학 및 항공우주공학과 ) ▷공저자네트워크등록하기
    정찬영 (Chanyeong Jeong ,Mechatronics R&B Center, Samsung Electronics Co ) ▷공저자네트워크등록하기
    구자예 (Jaye Koo ,한국항공대학교 항공우주및기계공학부 ) ▷공저자네트워크등록하기
    윤영빈 (Youngbin Yoon ,서울대학교 기계항공공학부 ) ▷공저자네트워크등록하기
    초록
    초록(영문)

    Combustion instability is caused by the coupling of acoustics, hydrodynamics, and flame dynamics. Therefore, understanding the dynamic characteristics of the injector ejecting fuel and oxidizer into the combustion chamber is very important in understanding the combustion instability. This study measures the injector transfer function (ITF) to investigate the dynamics of a gas–gas coaxial jet–swirl injector capable of simulating a full-flow staged combustion cycle. The ITF peaks were generated at the frequency corresponding to the resonant frequency of the tube through which the excited fluid flows. The Kelvin–Helmholtz (K–H) instability was strong when the velocity difference between two flows (ΔV) was large; hence, the ITF was large. The K–H instability weakened and the ITF was small when ΔV ≈ 0, but the Holmboe instability corresponding to the second mode of the K–H instability occurred, such that the perturbation corresponding to twice the excitation frequency became bigger. The results of the dynamic characteristics of the gas–gas coaxial jet–swirl injector in this study will be helpful in understanding the injector dynamics and in solving the combustion instability, which applies to the full-flow staged combustion cycle.

    keyword Injector dynamics, Combustion instability, K–\;H instability, Holmboe instability, Shear layer instability
    저널명 International Journal of Aeronational and Space Sciences ▷관련저널보기
    VOL 19
    PAGE 0920
    발표년도 2018
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