http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
V-gutter 형 보염기를 장착한 모델 램제트 연소기의 화염 특성 및 연소 불안정 연구
송진관(Jinkwan Song),황정재(Jeongjae Hwang),송재천(Jaecheon Song),윤영빈(Youngbin Yoon) 한국추진공학회 2008 한국추진공학회 학술대회논문집 Vol.2008 No.11
The goal of this study is to find flame dynamic behavior using a transverse fuel injection in a model combustor, and is to investigate main causes of unstable combustion in a liquid-fueled combustor.For transverse fuel injection into air cross flow, spray result shows similar tendency with Wu et al.[1998] until spray arrives at flame-holder. However, passing through flame-holder, fuel inflow into recirculation region of flameholder is not sufficient so it makes large difference between shear flame and recirculation flame behind flameholder. In combustion tests, the stable flame shows a kind of shear flames and low peaks of dynamic pressure frequencies. On the other hand, unstable flame shows periodic detached flame in recirculation zone and a strong peak of dynamic pressure frequency. The instability frequency is highly affected by influx air velocity, air temperature, equivalence ratio and wake or vortex shedding frequency behind the flameholder
송진관(Jinkwan Song),안규복(Kyubok Ahn),오정석(Jeong-seog Oh),윤영빈(Youngbin Yoon) 한국유체기계학회 2006 유체기계 연구개발 발표회 논문집 Vol.- No.-
The effect of internal liquid flow on spray plume characteristics was performed experimentally in subsonic crossflows. The injector internal flow was classified as three modes such as a normal, cavitation, and hydraulic flip. The objectives of the research are to investigate the effect of internal liquid flow on the spray plume characteristics and compare the trajectory of spray plume with previous works. The results suggest that the trajectory of spray plume can be correlated as a function of liquid/air momentum flux ratio(q), injector diameter and normalized distance from the injector exit(x/d). It’s also found that the injector internal turbulence influences the spray plume characteristics significantly.
V-gutter 타입의 보염기를 가진 연소기 내의 연소 주파수 요인 분석 및 Active tuned passive control 가능성 연구
송진관(Jinkwan Song),송재천(Jaecheon Song),황정재(Jeongjae Hwang),윤영빈(Youngbin Yoon) 한국연소학회 2009 KOSCOSYMPOSIUM논문집 Vol.- No.38
Causes of combustion frequenies occurring during combustion in model combustor with V-gutter flameholder are experimentally investigated with airflow speed of 26㎧ and equivalence ratio of 0.38~0.74. For acquiring combustion frequency and rms value simultaneously, four dynamic pressure sensors were used at combustor. With the results of each dynamic pressure, causes of combustion frequencies of the model combustor are considered as 1L open-end longitudinal mode, 1L closed-end longitudinal mode, vortex shedding. Moreover, liquid fuel effect and nozzle effect were observed in this combustor. And then, active tuned passive control was performed with 1L open-mode longitudinal mode which is most strongest. The amplitude of 1L open-mode longitudinal frequency decreases about 50 percent, and it is found that this method can be used for controlling combustion instability.
V-gutter 형 보염기가 장착된 모델 연소기 내에서 발생하는 화염 특성 및 연소 불안정성 연구
송진관(Jinkwan Song),정찬영(Chan young Jeong),윤영빈(Youngbin Yoon) 한국연소학회 2011 KOSCOSYMPOSIUM논문집 Vol.- No.42
Mechanism of combustion frequencies occurring during combustion is experimentally investigated in a model combustor with V-gutter flameholder. The combustor has a long duct shape with a cross section area of 40 × 40 ㎜. The v-gutter type flameholder with 10, 12, 14㎜ width is mounted at the side wall of combustor. CNG were used as fuel, and the fuel was injected transversely into air crossflow. It is found that combustion frequencies were considered as first longitudinal mode caused by combustor geometry. And it is found that flameholder length affects the flame holding range. Also, it is observed first longitudinal pressure oscillations make significant changes of flame structure.
V-gutter 형 보염기가 장착된 모델 연소기 내에서 발생하는 화염 동특성 연구
송진관(Jinkwan Song),정찬영(Chan young Jeong),윤영빈(Youngbin Yoon) 한국추진공학회 2010 한국추진공학회 학술대회논문집 Vol.2010 No.11
본 연구는 V-gutter형 보염기를 장착한 연소기 내에 발생한 연소 주파수의 발생 메커니즘에 대해 규명하는 것이다. 연소기는 40 X 40 mm의 단면적을 가진 긴 덕트 형상을 가지고 있으며, 10,12,14mm의 폭을 가진 V-gutter 형의 보염기를 장착하였다. 연료로 CNG를 수직 분사하여 실험을 수행하였다. 연소시 발생하는 주파수는 연소기의 형상에 기인한 1L 종방향 모드가 발생함을 확인하였다. 또한 보염기의 크기가 화염 가능 영역의 범위에 영향을 미침을 확인하였다. 그리고 종방향 모드의 압력변동이 화염 구조에 중요한 영향을 미침을 확인하였다. Mechanism of combustion frequencies occurring during combustion is experimentally investigated in a model combustor with V-gutter flameholder. The combustor has a long duct shape with a cross section area of 40 x 40 mm. The v-gutter type flameholder with 10, 12, 14mm width is mounted at the side wall of combustor. CNG were used as fuel, and the fuel was injected transversely into air crossflow. It is found that combustion frequencies were considered as first longitudinal mode caused by combustor geometry. And it is found that flameholder length affects the flame holding range. Also, it is observed first longitudinal pressure oscillations make significant changes of flame structure.
V-gutter형 보염기를 장착한 모델 연소기 내의 연소 주파수 발생 메커니즘 연구
송진관(Jinkwan Song),황정재(Jeongjae Hwang),송재천(Jaecheon Song),윤영빈(Youngbin Yoon),이종근(Jongguen Lee) 한국추진공학회 2009 한국추진공학회 학술대회논문집 Vol.2009 No.5
본 연구는 v-gutter형 보염기를 장착한 연소기 내에 발생한 연소 주파수의 발생 메커니즘에 대해 규명하는 것이다. 연소기는 40 X 40 mm의 단면적을 가진 긴 덕트 형상을 가지고 있으며, 14mm의 폭을 가진 v-gutter 형의 보염기를 장착하였다. 연료로 등유와 메탄를 수직 분무하여 실험을 수행하였다. 연소 시 발생하는 주파수는 연소기의 형상에 기인한 1L 종방향 모드와 보염기에서 발생하는 와류 주파수가 주로 발생함을 확인하였다. 또한 연료의 특성에 기인한 주파수와 노즐의 영향에 대한 주파수가 저주파 영역에서 발생함을 확인하였다. Mechanism of combustion frequencies occurring during combustion is experimentally investigated in model combustor with V-gutter flameholder. this combustor has a long duct shape with a cross section area of 40 x 40 mm. The v-gutter type flameholder with 14mm width is mounted at the bottom of combustor. Kerosene and methane were used as fuel, and these fuel were injected transversely into air crossflow. It is found that combustion frequencies were considered as 1L longitudinal mode caused by combustor geometry and vortex shedding mode of flameholder. And fuel phase effect and nozzle effect were also observed in the low frequency range.
덕트 형상 연소기내의 연소 진동 감소를 위한 헬름홀츠 공진기의 적용
송재천(Jaecheon Song),송진관(Jinkwan Song),황정재(Jeongjae Hwang),윤영빈(Youngbin Yoon) 한국연소학회 2009 KOSCOSYMPOSIUM논문집 Vol.- No.39
Combustion oscillations are caused by a coupling between acoustic waves and unsteady heat release. They can be eliminated using passive controller such as a Helmholtz resonator. But, Helmholtz resonator is normally only effective over a narrow frequency range. In this work, Helmholtz resonator is applied for reducing the combustion oscillations and we vary the Helmholtz resonator volume using piston in oder to tune in the wide range of operating conditions. As the result, it is found that the dominant combustion oscillations can be largely reduced by optimizing the size of resonator volume. And, interesting relation for phase difference of dynamic pressure both combustor and the Helmholtz resonator are presented in this paper. Also, we investigate tuned passive control using phase difference.
액체 램제트 엔진에서 Actively Tuned Passive Control 가능성의 실험적 연구
송재천(Jaecheon Song),송진관(Jinkwan Song),황정재(Jeongjae Hwang),윤영빈(Youngbin Yoon) 한국추진공학회 2009 한국추진공학회 학술대회논문집 Vol.2009 No.5
연소불안정현상은 주로 음향파와 열방출률 섭동간의 상호작용에 의해 발생한다고 알려져 있다. 이러한 현상은 헬름홀츠 공진기와 같은 수동제어기를 사용하여 감소시킬 수 있다. 그러나 헬름홀츠 공진기는 일반적으로 좁은 주파수대역에 대해서만 효과가 있는 단점을 가진다. 따라서 본 연구에서는 다양한 작동 범위에서 효과를 가질 수 있도록 피스톤을 사용하여 헬름홀츠 공진기의 부피를 변화시켜가며 연소불안정현상에 적용하였다. 그 결과 피스톤을 최적위치에 동조시킴으로써 연소 불안정 모드의 진폭을 감소시킬 수 있었다. 또한 이러한 결과를 바탕으로 능동적으로 동조되는 수동제어방식의 가능성에 대해서 알아보고자 한다. Combustion oscillations are caused by a coupling between acoustic waves and unsteady heat release. They can be eliminated using passive controller such as a helmholtz resonator. But, helmholtz resonator is normally only effective over a narrow frequency range. In this work, helmholtz resonator is applied for reducing the combustion oscillations and we vary the helmholtz resonator volume using piston in oder to tune in the wide range of operating conditions. As the result, it is found that the dominant combustion oscillations can be reduced by optimizing the size of resonator volume. Also, from these results, we investigate feasibility of actively tuned passive control.