Profiles of Droplets Density, Momentum Flux and Velocity in a Diesel Spray

概要

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The Profile of the velocity of a diesel spray, which is a liquid-gas two phase flow with high velocity, is a significant phenomenon to analyze the mixing and combustion processes in a diesel engine. It is impossible to measure the velocity because a large number of droplets and entrained air exist in the spray. In the experiments presented here, the composed velocity of droplets and entrained air was calculated by using a model built under certain assumptions, using the droplet area density measured with the laser light extinction method and the momentum flux measured with a newly developed probe. The validity of the model was examined by comparing the velocity profile with the measured data and that predicted by the numerical calculations based on the well-known KIVA code for diesel spray. As a result, the profiles of droplet density, momentum flux and velocity in a diesel spray are very similar to those in unsteady gas and water jets.
日本混相流学会の論文