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기체 중심 동축형 분사기의 갭 두께 변화에 따른 액체 가진 연구
오석일(Sukil Oh),박구정(Gujeong Park),김성주(Seongju Kim),이형원(Hyeongwon Lee),윤영빈(Youngbin Yoon) 한국추진공학회 2016 한국추진공학회 학술대회논문집 Vol.2016 No.12
액체 로켓엔진에서 연소불안정 연구는 연소효율 저감 및 연소실 파괴를 예방하기 위해 중요하다. 이러한 연소불안정 현상을 해결하고자 단일 분사기의 액체 가진을 통한 연구들이 진행되어왔다. 하지만 실제 로켓 엔진에서는 동축형 분사기가 사용되기 때문에 동축형 분사기에서의 액체 가진 연구가 필수적이다. 본 연구에서는 기체 중심 스월 동축형 분사기에서 갭 두께의 변화를 통해 동특성을 파악하였다. It is important to study on the combustion instability to develop liquid rocket engines for preventing lower combustion efficiency and destruction of combustion chamber . There are many researches on simplex injector with liquid pulsation to solve this problem. In real rocket engine system, however, they use coaxial injectors. Therefore, research on coaxial injector with liquid pulsation is essential. In this study, we investigate dynamic characteristics of gas centered swirl coaxial injector varying gap thickness.
기체 중심 동축형 분사기의 접선방향 유입구 지름 변화에 따른 액체 가진 연구
오석일 ( Sukil Oh ),박구정 ( Gujeong Park ),김성주 ( Seongju Kim ),이형원 ( Hyeongwon Lee ),윤영빈 ( Youngbin Yoon ),최정열 ( Jeong-yeol Choi ) 한국액체미립화학회 2017 한국액체미립화학회지 Vol.22 No.2
It is important to study on the combustion instability to develop liquid rocket engines for preventing lower combustion effi-ciency and destruction of combustion chamber. There are many researches on simplex injector with liquid pulsation to solve this problem. In real rocket engine system, however, they use coaxial injectors. Therefore, research on coaxial injector with liquid pulsation is essential. In this study, we investigate dynamic characteristics of gas centered swirl coaxial injector varying tangential inlet diameter. A mechanical pulsator was used to generate an excitation in the liquid flow, and the response char-acteristics of the injector were confirmed. As tangential inlet diameter increased, mass flow rates increased and spray angle decreased. As tangential inlet diamter decreased, gain decreased because the pressure fluctuation in the injector manifold rarely passed through the inlet. Additionally, it was confirmed that a sufficiently small tangential inlet served as a damper.