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The OH molecule is a highly reactive combustion intermediate and relatively abundant in combustion systems. It also has the availability of convenient UV -laser systems to excite the A²Σ-X²?? electronic transition. The spectroscopic parameters describing this transition are well known. In this research, the OH molecule was measured in the laminar flame burner and constant volume combustion chamber(CVCC) in order to use it as the fundamental data for studying combustion phenomena. The LIF images of the OH molecule in the laminar 리ame burner were caught by using KrF excimer laser and ICCD camera. The natural fluorescence<br/> of OH was also measured by the interference filter(310 nm) and spectrometer in the CVCC at different equivalence ratios.
Tunable KrF excimer laser is used to measure OH moleclule in the steady state flame. Laser induced predissociative fluorescence(LIPF) method which is not sensitive to collisional quenching is applied. The fluorescence spectrum is obtained by exciting 02(11) line in theA²Σ(v' = 3)- X²Ⅱ( v" = 0) transit <br/> 'n and 2 dimensional images are also measured by ICCD camera. The fluorescence images show OH radicals diffuse out both sides of flame fronts and at higher mixture velocities they have narrow distribution.<br/>
The concentration and spatial distribution of vapor phases in DI (Direct Injection) gasoline spray were measured quantitatively by exciplex fluorescence method. Fluorobenzene and DEMA (diethylmethylamine) in a solution of hexane were used as the exciplex-forming dopants. The fluorescence intensity of vapor phase were obtained by ICCD camera with the appropriate filter The relationship between fluorescence intensity and vapor concentration was induced for the purpose of a quantitative analysis. The 2-D vapor/liquid images of fuel spray were captured under the evaporation condition, and the spatial distribution of vapor concentration was obtained. The spatial distribution of liquid phase had hollow-cone shape. And the vapor phase was widely distributed in the whole spray. The behavior of vapor phase was significantly affected by second flow such as entrainment, vortex, while that of liquid phase was scarcely affected.
This work was performed to provide qualitative information on the distribution of vapor and liquid phase of fuel sprayed through swirl injector using exciplex fluorescence technique. Dopants used for experiment were 2% fluorobenzene and 9% DEMA in 89% hexane by volume ratio. The ambient conditions inside spray chamber were at constant temperature of 393K and pressure of 0.3MPa. As a result, fluorescence intensity of vapor phase emitted from dopant was much greater than that of liquid phase. Fluorescence intensity of liquid phase was strongly observed at injector tip and at the edge of spray due to leading mass. Differences between fluorescence intensity of vapor and liquid phases were increased along the axis of spray. Fluorescence intensity of vapor at the distance of 35~65mm from injector tip was weak compared with that at injector tip due to the dispersion of vapor phase. The radial distribution of fluorescence intensity of spray was also decreased with the distance from injector tip.<br/>
The fuel-air mixing processes affect on the combustion performance and the exhaust emission. Thus it is very important to know how evaporated fuel is being mixed with air in engine cylinder. One of the measurement techniques for vapor phase is the Exciplex fluorescence visualization technique. The base fuel and the dopant were used 99.5% hexane and 0.5% fluorobenzene in volume ratio respectively.<br/> The results were presented with excess air ratio and elapsed time after fuel evaporation at constant temperature(473K) and pressure(0.5MPa). Fluorescence intensity emitted from dopant was decreased with increase of excess air ratio. Temporal change of fluorescence intensity at constant ambient condition decreased slightly within the range of measured time. 2-dimensional images were also illustrated with excess air ratio.<br/>