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Laser Raman Scattering 을 이용한 가스 분무내 당량비 계측에 관한 실험적 연구
진성호(Seongho Jin),박경석(Kyoungsuk Park),김군홍(Gunhong Kim),김경수(Gyungsoo Kim) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.6_1
Laser Raman scattering method has been applied to measure equivalence ratio of methane/air mixture in injected spray. We used high power KrF excimer Iaser(X=248nm) and a high gain ICCD camera to capture low intensity Raman signal. Raman shifts and Raman cross-sections of H2, O2, N2,CO2, CH4 and C3H8 are measured precisely. Our results show an excellent agreement with other groups. Mole fraction measurement of O2 and N2 from air shows that O2: N2 = 0.206 : 0.794.<br/> We used gas injector which is operated at lbar. Methane is used as a fuel. Spray region is 10mmx37mm and this region is divided into 80 points. 100 Raman signals are obtained and ensemble averaged for each point. 3-d and contour plot of distribution of equivalence ratio is presented. Our measured results show that the equivalence ratio of methane/air mixture in methane-rich region is reasonable. However, more study is necessary for methane-lean region because background noise level is almost same as Raman intensity of methane.<br/>