Abstract
A distribution of fuel concentration in a diesel spray was measured by means of the planer laser induced fluorescence (PLIF) technique. The diesel spray was formed by injecting fuel into a constant volume vessel with high temperature and high pressure condition. The local equivalence ratio and temperature were estimated based on the adiabatic mixing assumption and temperature dependency of the fluorescence intensity. The instantaneous distribution of fuel concentration, its ensemble average and fluctuation were obtained. Probability density functions of fuel concentration in whole measurement area show that an average distribution does not reproduce an instantaneous distribution, while there is some possibility that the average distribution with the fluctuation describes an instantaneous distribution. In addition, the effect of injection pressure and nozzle orifice diameter was investigated. The result shows that when injection pressure is increased with the fixed nozzle orifice diameter, the distribution of fuel concentration in a spray does not change. With smaller nozzle orifice diameter, the average and the fluctuation of fuel concentration decrease.
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