Abstract
Keywords: direct injection, multi-hole nozzle, spraying, homogenous mixture, smoke degree, nitrogen oxides.
The paper presents the experimental results obtained on a high power engine taking in consideration the possibility of smoke degree reduction by acceptable changes on the existing injection system. It is proved that by modification of the numbers of holes of the nozzle (realized by authors) and keeping the total injection surface it is conserved the injection law in order to have the same burning process; on the other hand improving the pulverization quality, decreasing of the drops dimensions and keeping the penetration distance lead to a progressive and complete burning process and, as a final conclusion, are obtained the same energetical performances and considerable decreasing of the smoke at main working regimes.