A Study of the Spray Characterization from a Centrifugal Nozzle by Pulsed Laser Holography

Abstract

Centrifugal nozzle is an important part of an areoengine in which fuel atomization has strong influence on engine performance. For investigating the fuel spray characteristics, a promising method named off-axis particle holographic measuring system is used here. Characteristics of the nonevaporating spray ejected from a new type of centrifugal nozzle which would be used in the near future are obtained under various injection conditions. By automatic analysis of the holographic reconstructed droplets images, a hollow-cone shape spray with most droplets concentrated in the surface of the cone is observed, and the spray cone angle, droplet sizes and their spatial locations in concerned region are obtained quantitativly. In the near region of the nozzle exit, droplets show greater SMD value, while at a certain distance from the nozzle, the droplets SMD differences become unconspicuous which shows a better atomization. These informations are helpful to understand characteristics of the centrifugal nozzle and offer a database for validating the spray simulation code.

Laser holography measurement and theoretical analysis of a pressure-swirl nozzle spray

“…Details and demonstration of the laser holography technique can be found elsewhere. 15 The focus of the current work is on the experimental result analysis of the current pressure-swirl injector and comparison with the theoretical prediction.…”