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http://dx.doi.org/10.6108/KSPE.2018.22.4.099

Dynamic Characteristics of Coaxial Swirl-jet Injector with Acoustic Excitation  

Bae, Jinhyun (Department of Mechanical and Aerospace Engineering, Seoul National University)
Kim, Taesung (Department of Mechanical and Aerospace Engineering, Seoul National University)
Jeong, Seokgyu (Department of Mechanical and Aerospace Engineering, Seoul National University)
Jeong, Chanyeong (Mechatronics R&D Center, Samsung Electronics Co., Ltd.)
Choi, Jeong Yeol (Department of Aerospace Engineering, Pusan National University)
Yoon, Youngbin (Department of Mechanical and Aerospace Engineering, Seoul National University)
Publication Information
Journal of the Korean Society of Propulsion Engineers / v.22, no.4, 2018 , pp. 99-107 More about this Journal
Abstract
In this study, the injector transfer function (ITF) of a gas-gas coaxial jet-swirl injector is measured by perturbing jet or swirl flow using a speaker as jet flow increases. As a result of measuring the ITF varying feed system length, a peak occurs at a resonance frequency of space where the perturbed flow passes. With jet excitation, the ITF magnitude decreases, but increases thereafter as increasing the jet flow. Therefore the larger the velocity difference between jet and swirl flow, the larger the ITF. With swirl excitation, ITF decreases as increasing the jet flow because of the energy decrease with respect to the constant downstream flow.
Keywords
Injector Transfer Function; Full Flow Staged Combustion Cycle; Gas-gas Injector; Coaxial Swirl-jet Injector; Combustion Instability;
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