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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)

THE STRUCTURE AND DIMENSIONS OF THE TIME DEPENDENT BREAK-UP ZONE OF DIESEL SPRAYS

Andrew J. Yule
Spray Research Group (SRG), Insititute of Materials Research (IMR), School of Computing, Science and Engineering, University of Salford, Manchester, UK; Thermofluids Division, Department of Mechanical Engineering, UMIST

D. G. Salters
Thermofluids Division, Department of Mechanical Engineering, UMIST, Manchester, England

Abstract

Conductivity probe measurements, varying nozzles, liquid properties and gas density, reveal more extensive information on the break-up of pulsed diesel sprays than has been published to date. The spray from a single hole orifice type nozzle has an incompletely atomized break-up length which extends at least one hundred diameters downstream. The structure of this break-up zone varies, depending on the liquid properties and initial and boundary conditions, from a central column, with outer drops and ligaments, to, a "wire wool" structure of ligaments and drops. Time variation of the break-up length occurs and concentrations of poorly atomized liquid move as coherent structures.