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Liquid Column Trajectory in Acoustically-Modulated Crossflows
( Yoonho Song ),( Donghyun Hwang ),( Kyubok Ahn ) 한국액체미립화학회 2017 한국액체미립화학회 학술강연회 논문집 Vol.2017 No.-
This paper presents experimental results on the characteristics of liquid column trajectory for liquid jet with 0.5 mm diameter transversely injected into acoustically-modulated air crossflows. The air velocity was approximately fixed to 35 m/s and thus aerodynamic Weber number was 10.775 corresponding to the bag breakup regime. The Reynolds number of the liquid jet was between 2000 and 10000. Two 300 W acoustic drivers were built ahead of the test section to provide modulated inlet air flows and were set to 150 Hz. Air velocity fluctuations changed from 0% to 30% based on the measurement of pressure fluctuations in the test section. The shadowgraph technique which could synchronize with pressure fluctuations was used to characterize the response of liquid column trajectory under oscillating/non-oscillating crossflows. Eight different phase-averaged images obtained from 400 instantaneous images were utilized to understand the response behavior according to the phase angle. Liquid column trajectories were measured with an interval of 0.2 mm until the liquid column fracture point. Upper points of the liquid column were detected using an edge detection algorithm. The results showed that as the level of air velocity fluctuations increased and the Reynolds number of liquid jets decreased, modulation of liquid column trajectories became greater.
Low-enthalpy geothermal exploration in Pohang area, Korea
Yoonho Song,Seong Kon Lee,Hyoung Chan Kim,Weon-Seo Kee,Yeong-Sue Park,Mu-Taek Lim,Jeong-Sul Son,Seong-Jun Cho,Seong-Keun Lim,Toshihiro Uchida,Yuji Mitsuhata,Tae Jong Lee,Heuisoon Lee,Hyoung-Rae Rim,Se 한국암반공학회 2003 한국암반공학회 학술대회 및 세미나 자료집 Vol.- No.-
송윤호(Yoonho Song),이원구(Woongu Lee),안규복(Kyubok Ahn) 한국추진공학회 2017 한국추진공학회 학술대회논문집 Vol.2017 No.5
본 논문에서는 충돌형 분사기를 이용하여 수직분사 실험을 진행하였으며, 기존의 단공 오리피스의 분사기와 비교하여 분무특성에 어떠한 변화가 있는지 실험적으로 연구하였다. 또한 동일 오리피스 길이 대 직경비(L/d = 5)를 갖는 분사기를 바탕으로 충돌각(60, 90, 120)의 변화에 따른 액체 분무특성을 파악하였다. Top view의 기준 방향으로 y 방향에서의 분열길이 결과를 보면, 충돌각이 증가할수록 분열길이가 전체적으로 감소함을 알 수 있었다. 반면에 충돌형 분사기를 side view 기준으로 보았을 때, x 방향에서의 분열길이는 이전 단공노즐에서의 분열길이보다 더욱 감소하였으며, 이는 단공노즐의 분사기보다 충돌형 분사기의 미립화 성능이 우수함을 의미한다. Spray characteristics of the impinging injectors in subsonic crossflows were experimentally studied and compared with the plain-orifice injectors. By changing the impingement angle (60, 90, 120) which is the same orifice length to diameter ratio (L/d = 5), spray characteristics were investigated. In the view of the top view from the impinging injectors, as the impingement angle increases, the liquid column breakup length in the y-direction was decreased. On the other hand, when the impinging injector is viewed from the side view, the breakup length in the x direction is smaller than the previous plain-orifice injectors, which mean that the atomizing performance of the impingement-type injector is better than that of the single-hole orifice.