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미립화 및 분무장치 2 : 기체 중심 전단 동축형 분사기의 리세스 변화에 따른 불안정
윤정수 ( Jung Soo Yoon ),백경엽 ( Kyong Yup Paik ),정재묵 ( Jae Mook Chung ),윤영빈 ( Young Bin Yoon ) 한국액체미립화학회 2012 한국액체미립화학회 학술강연회 논문집 Vol.2012 No.-
The instability characteristics of shear coaxial injectors are studied with various injection conditions, such as the pressure drop of liquid and gas phase, and recess ratio. When self-pulsation occurs, intense scream and mass flow rate oscillations are detected by the strong interaction between liquid and gas phase. In this research spray oscillation frequency and spray patterns are measured by laser diagnostics and indirect photography.
입자 부상 제트에서 오리피스 길이가 입자 분포에 미치는 영향에 대한 연구
윤정수(Jungsoo Yoon),백경엽(Kyong-Yup Paik),길태옥(Taeock Khil),윤영빈(Youngbin Yoon) 한국추진공학회 2012 한국추진공학회지 Vol.16 No.6
As a propellant of a high speed underwater vehicle, the hydro-reactive solid metal particles using seawater as a oxidizer maximizes its specific impulse when the solid metal particles and the seawater are uniformly mixed in the combustion chamber. The purpose of this study is to investigate the effects of injector geometry on the particle distribution of similarity point of view. For the purpose of this similarity of the mean velocity and particle number density along the radial direction was measured by Particle Image Velocimetry(PIV).
동축공기 유동장에서 수소 난류확산 부상화염의 안정화 연구
황정재(Jeongjae Hwang),오정석(Jeongseog Oh),백경엽(Kyong-Yup Paik),윤영빈(Youngbin Yoon) 한국연소학회 2010 KOSCOSYMPOSIUM논문집 Vol.- No.40
To understand hydrogen jet liftoff height, the stabilization mechanism of turbulent lifted jet flames under non-premixed conditions was studied. The objectives were to determine flame stability mechanisms, to analyze flame structure, and to characterize the lifted jetat the flame stabilization point. Hydrogen flow velocity varied from 100 to 300 ㎧. Coaxial air velocity was regulated from 12 to 20 ㎧. Simultaneous velocity field and reaction zone measurements used, PIV/OH PLIF techniques with Nd:YAG lasers and CCD/ICCD cameras. Liftoff height decreased with increased fuel velocity. The flame stabilized in a lower velocity region next to the faster fuel jet due to the mixing effects of the coaxial air flow. Lifted flame stabilization was related to local principal strain rate and turbulent intensity, assuming that combustion occurs where local flow velocity and turbulent flame propagation velocity are balanced.