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김태권,박정,신현동,Kim, Tae Kwon,Park, Jeong,Shin, Hyun Dong 대한기계학회 1999 大韓機械學會論文集B Vol.23 No.6
An experimental investigation has been conducted with the objective of studying the mixing mechanism near the nozzle exit in a tone-excited jet diffusion flame. The fuel jet was pulsed by means of a loudspeaker-driven cavity. The excitation frequencies were chosen for the two cases of the non-resonant and resonant frequency identified as a fuel tube resonance due to acoustic excitation. The effect of tone-excitations on mixing pattern near the nozzle exit and flame was visualized using various techniques, including schlieren photograph and laser light scattering photograph from $TiO_2$ seed particles. In order to clarify the details of the flame feature observed by visualization methods, hotwire measurements have been made. Excitation at the resonant frequency makes strong mixing near the nozzle. In this case, the fuel jet flow in the vicinity of nozzle exit breaks up into disturbed fuel parcels. This phenomena affects greatly the combustion characteristics of the tone excited jet and presumably occurs by flow separation from the wall inside the fuel nozzle. As a result, in the resonant frequency the flame length reduces greatly.
층류화염에서 연료의 예혼합도(premixedness)에 따른 질소산화물(NOx) 및 일산화탄소(CO)생성 특성
김태권(Tae Kwon Kim) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.6_1
Experimental measurements of NOx and CO using chemiluminescent detection are made in laminar premixed flames with the aim of studying the effects of partial premixing of center fuel stream with air on NOx and CO formations. The measurements are taken in flames with an overall equivalence ratio of 0.5. fuel-tube equivalence ratios varying from 1.1 to 10. and a fixed fuel flowrate of 0.15slpm. The flames are categorized into two distinct types and one intermediate type of flame pattern. The intermediate dual-flame pattern is identified which minimizes the NOx emission index.<br/>