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Proceedings of the Seventh International Conference on Liquid Atomization and Spray Systems

ISBN Druckformat: 89-950039-2-8

Effects of Fuel Viscosity and Ambient Temperature on Spray Characteristics from Multi-Hole Nozzle Injectors


A study of fuel spray characteristics for different fuels from multi-hole nozzle injectors was performed. Two different injection systems were used on two test rigs. A main feature of the hot ambient temperature system (hot bomb) used was that analysis of all the fuel plumes could occur at one time, and all the plumes were imaged on the same piece of film. Spray behavior was examined for five different fuels and for ambient temperatures up to 500 K in the hot bomb. The results yielded tip penetration length and spray cone angle for each of the spray plumes from a six hole injector. A second system was used to perform the droplet size measurement under room temperature condition (cold bomb), and the two most different fuels were selected for the experiments. The results in this paper show how the spray plumes behave as they leave each of the six holes of the injector. The characteristics of each hole differ during injection. The variations of spray cone angle and tip penetration length between holes are small but significant. These variations in tip penetration and cone angle changed as the temperature of the chamber changed, but the overall characteristics of the spray plumes changed only slightly for the temperatures used in this paper. The effect of fuel viscosity on the spray tip penetration length is insignificant. Higher viscosity.fuels gave smaller spray cone angles and larger overall average droplet sizes.
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