A Study of the Influence of Fuel Atomization Vaporization,and Mixing Processes on Pollutant Emissions from Motor-Vehicle Powerplants.

摘要

The objectives of the experimental program were to obtain experimental data on droplet impaction characteristics,fuel-film flow on manifold walls,and fuel vaporization for a better understanding of induction-system phenomena;and to demonstrate the potential of improved fuel atomization,fuel vaporization,and intake manifold design for improving air-fuel mixing and distribution. Ultrafine atomization,minimum manifold-passage turning angle,long passage bend radii,and low air velocity can reduce droplet impaction in an induction system. However,appreciable droplet impaction still occurs,even with droplet sizes as low as 14microns,because of deposition by flow-induced air turbulence. Consequently,fuel vaporization by intake air preheating and by manifold surface heating is recommended in addition to improved atomization to reduce further the fuel film on the wall. An improved induction-system design concept is described. (Author)