Evaporating spray and flame distributions in the combustion chamber of a direct injection diesel engine

The characteristics of an evaporating diesel spray and the flame distribution in a combustion chamber of a D.I. diesel engine were investigated by using the laser light technique. The technique used was based on the extinctions of two wavelengths of ultraviolet and visible laser light. The transmitted laser light absorbed and scattered by the vapor, drops, soot and combustion products in the spray flame were separated into two wavelengths and captured. Further, the light radiated from the flame was imaged using the same measuring system by modifying the optical filters and the timing of the camera shutter.