A Comparison of Fuel Sprays from Several Types of Injection Nozzles

A series of tests was made of the sprays from 14 fuel-injection nozzles of 9 different types, the sprays being injected into air at atmospheric density and at 6 and 14 times atmospheric density. High-speed spark photographs of the sprays from each nozzle at each air density were taken at the rate of 2,000 per second, and from them were obtained the dimensions of the sprays and the rates of spray-tip penetration. The sprays were also injected against Plasticine targets placed at different distances from the nozzles, and the impressions made in the Plasticine were used as an indication of the distribution of the fuel within the spray. Cross-sectional sketches of the different types of sprays are given showing the relative sizes of the spray cores and envelops. The characteristics of the sprays ware compared and discussed with respect to their application to various types of engines.