Abstract
The growing interest in diesel engines and vehicles has put more concern on the environmental issues especially the small particles coining out of the diesel exhaust. This has resulted in regulatory efforts to reduce emissions of these fine particles. Particulates, a main constituent of white smoke poses a big problem for the diesel engine manufacturers and has triggered a heavily focused research in the automotive and aftertreatment industry. One aspect goes into the basics of the diesel fuel spray formation and characteristics and looks at the influence of the different parameters affecting fuel particle size and distribution and the other aspect looks at the actual measurement of white smoke under cold starting of diesel engine. The effect of ambient temperature and fuel properties on white smoke is investigated. The effect of engine speed and ignition delay is discussed. The breakdown of white smoke in terms of gaseous hydrocarbons, liquid and solid particulates is studied. A comparative study is made between white smoke and in it’s three forms for diesel fuel (DF2) and jet fuel (JP8). The fuel accumulated in the engine during cranking plays a major role in the emission of white smoke under cold starting conditions.