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ICLASS 94<br>Proceedings of the Sixth International Conference on Liquid Atomization and Spray Systems

ISBN:
978-1-56700-019-1 (Print)
978-1-56700-445-5 (Online)

EFFECT OF INJECTOR ORIFICE CONFIGURATIONS ON ATOMIZATION

K. Ramamurthi
Thermodynamics and Combustion Laboratory, Indian Institute of Technology, Madras, Chennai 600036, India

K. Nandakumar
Propulsion Research and Studies Group, Propulsion Systems Centre Trivandrum, India

Abstract

Experiments are conducted with water to determine the influence of the length to diameter ratio (L/d0) of the sharp-edged entry orifice and its exit geometry on the atomization. Both swirled and non-swirled water jets are investigated. The Sauter mean diameter of the droplets is shown to be smaller at lower values of L/d0 of the orifice for the swirled and non-swirled jet. The increased azimuthal vorticity for non-swirled jet and the higher whirl momentum in the case of the swirled jet at the smaller L/d0 values are seen to be responsible for reduced droplet sizes. The range of variation of the sizes of the droplets is however larger at the small L/d0 values. The influence of flow and geometrical variables on atomization are discussed.