Abstract
Abstract This paper makes use of both new and previously published material in studying the hydraulic actions and limitations of fuel-injection nozzles. The primary function, hydraulically, of such a nozzle is to inject all portions of the fuel at velocities above a certain minimum necessary for atomization. The most serious factor tending to prevent this is the wide range of speeds found in present small Diesel engines. It is found that the closed nozzle meets the requirements of speed flexibility better than the simple open type, and that the variable-area-orifice closed nozzle is a further improvement over the plain-hole closed nozzle. The effects on the rate of injection and minimum regular quantity of injection are noted.
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