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조준익(Joon Ik Jo),강기중(Ki Joong Kang),이기만(Kee Man Lee) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.5
본 연구는 연료가스가 노즐로 분출되기 전 유동경로에 버너공동을 설치하여 발생되는 구멍음에 의해 가진 되었을 때 비예혼합 부상 제트화염의 특징 변화를 관찰하였다. 실험을 위해 1/2” 자유 영역 마이크로 폰을 이용하여 측정하였고 낮은 주파수에서 공동이 장착되었을 때 음압레벨이 대폭 감소되는 효과를 얻을 수 있었으며 L/d를 비교했을 때 같은 레이놀즈 수에서 화염날림 속도가 증가되었다. 실험결과 부상화염의 소음감소와 안정성 개선효과를 확인 할 수 있었다. An experimental investigation of the noise characteristics of non-premixed lifted jet flames with a burner cavity has been performed. The noise is measured by 1/2”microphone at the flame base region. If there is a cavity under a burner nozzle, then flame noise was decreased significantly. Therefore it is ascertained that the cavity can be adopted with effective instruments as a method for noise reduction and flame stability.
비예혼합 제트 화염에서 고주파 발생에 의한 부상 화염 특성 연구
조준익(Joon ik Jo),강기중(Ki Joong Kang),이기만(Kee Man Lee) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
An experimental investigation of the characteristic of non-premixed lifted flames with high-frequency has been performed. Before the fuel was supplied to nozzle, the fuel was supplied through a speaker which was located under the nozzle. The fuel passed through the excitation speaker under the influence of the high-frequency affects the lifted flame characteristics. The measurements were performed in flow range that occurs lifted flame and blow out. When the high-frequency is generated from speaker, the lifted length became shorter, and noise reduced comparing to unexcitation case. Additionally, operating flow range was increased and diameter of flame base became smaller with high-frequency effect. Through this experiments, its ascertained that the high-frequency excitation can be adopted with effective method for flame stability and noise reduction.
비예혼합 제트 부상화염에서 노즐 홀톤에 의한 소음 특성 연구
조준익(Joon-Ik Jo),강기중(Ki-Joong Kang),이기만(Kee-Man Lee) 한국연소학회 2011 KOSCOSYMPOSIUM논문집 Vol.- No.43
An experimental investigation of the characteristic of non-premixed lifted flames with high-frequency has been performed. Before the fuel was supplied to nozzle, the fuel was supplied through a burner cavity which was located under the nozzle. The fuel passed through the excitation cavity under the influence of the high-frequency affects the lifted flame characteristics. The measurements were performed in flow range that occurs lifted flame and blow out. When the high-frequency is generated from burner cavity, the lifted length became shorter, and noise reduced comparing to unexcitation case. Additionally, operating flow range was increased and diameter of flame base became smaller with high-frequency effect. Through this experiments, it’s ascertained that the high-frequency excitation can be adopted with effective method for flame stability and noise reduction.
비예혼합 제트 부상화염에서 노즐 홀톤에 의한 소음 특성 연구
조준익(Joon-Ik Jo),강기중(Ki-Joong Kang),이기만(Kee-Man Lee) 한국연소학회 2011 KOSCOSYMPOSIUM논문집 Vol.- No.42
An experimental investigation of the noise characteristics of non-premixed lifted jet flames with a burner cavity has been performed. Before the fuel was supplied to nozzle, the fuel was supplied through a cavity which was located under the nozzle. The range of the experiment was lift-off limit of the flames to blow-off limit. When the burner cavity installed, there was significant reduction in sound level pressure and lift-off height was reduced. Additionally, the width of flame base was got narrowed, and blow-off limit was increased by the cavity effect. Therefore it is ascertained that the cavity can be adopted with effective instruments as a method for noise reduction and flame stability.
이중선회 연소기에서 화염형상과 파일럿과 주 화염의 상호작용에 관한 연구
조준익(Jun-Ik Jo),박태준(Tae-Joon Park),황철홍(Cheol-Hong Hwang),이기만(Kee-Man Lee) 한국추진공학회 2014 한국추진공학회지 Vol.18 No.4
Flame behaviors and interaction between pilot and main flames in a dual swirl combustor were investigated experimentally and numerically. Under the condition of fixed swirl angle of 45o for main flame, the swirl angle of pilot flame, total heat release rate and equivalence ratio of main flame were used as major parameters. As a result, detailed flame stability diagram of dual swirl combustor was identified in terms of 5 flame modes with the changes in total heat release rate and equivalence ratio of main flame. It was found that the swirl angle of pilot flame plays the most important role in the changes in flame location and overall flow structure inside the combustor, and thus leads to the significant change in the interaction between pilot and main flame.
합성가스(H<SUB>2</SUB>/CO)를 이용한 충돌제트 버너에서 스트레치된 예혼합화염의 화염 특성에 관한 연구
강기중(Ki-Joong Kang),조준익(Joon-Ik Jo),이기만(Kee-Man Lee) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
This paper presents both experimental and numerical investigation of the flame characteristics of stretched premixed lift-off flames using synthetic gas(H<SUB>2</SUB>/CO) in an impinging burner. Spin code which is a fortran program calculates one-dimensional stagnation flow is employed for numerical analysis. The impinging surface temperature is affected by local strain rate K, equivalence ratio, and composition ratio of fuel. From result of this work, we also found numerically that flame location which is directly related to surface temperature is greatly affected by local strain rate K.
충돌제트 버너에서 합성가스(H<SUB>2</SUB>/CO) 공기 예혼합 화염의 열전달 특성에 관한 실험적 연구
강기중(Ki-Joong Kang),조준익(Joon-Ik Jo),이기만(Kee-Man Lee) 한국추진공학회 2011 한국추진공학회 학술대회논문집 Vol.2011 No.5
합성가스를 이용한 충돌제트 버너에서 신장된 예혼합 화염의 열전달 특성에 관한 실험적 연구를 수행하였다. 본 연구에서는 석탄을 가스화하는 과정에서 추출되는 수소와 일산화탄소를 혼합한 합성가스를 연료로 사용하였다. 정체점에서의 열유속은 전체 신장율이 증가함에 따라 증가하다 다시 감소하는 것이 관찰되었다. 또한 정체점에서의 열유속이 노즐로부터 충돌판까지 거리가 증가함에 따라 증가하는 것을 확인하였다. 본 연구는 석탄에서 발생하는 부생가스의 주성분인 수소와 일산화탄소를 실용화하는 연구 중 기초 연구이다. An experimental investigation of the heat transfer characteristics of stretched premixed flames using Synthetic gas has been performed. Hydrogen and carbon mon-oxide which could be extracted from coal gasification process are the main fuel of synthetic-gas. Heat flux at the stagnation point was increased as global strainrate was increased, then the heat flux was decreased when a global strainrate reached a sudden point. Heat flux at the stagnation point is also affected by nozzle to impingement distance. Heat flux was increased as nozzle to impingement place distance was increased. This study is a foundation study of practical use of secondary gases from coals.
합성가스(H₂/CO)를 이용한 충돌제트 버너에서 예혼합화염의 온도 특성에 관한 실험적 연구
강기중(Ki-Joong Kang),조준익(Joon-Ik Jo),이기만(Kee-Man Lee) 한국연소학회 2011 KOSCOSYMPOSIUM논문집 Vol.- No.42
This paper presents an experimental investigation of the temperature characteristics of stretched premixed lift-off flames using Synthetic gas(H₂/CO) in an impinging burner. The temperature at the stagnation point measured by K-type thermocouple which was installed at the center of impingement plate. From the result of this work, The temperature was varied with global strainrate, equivalence ratio, H/d, and composition ratio of fuel. In order to understand the reasons these behaviors, we approached with radiative heat loss, flow velocity, and flame instability.