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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)

ELECTROSTATICALLY PRODUCED FUEL SPRAYS FOR COMBUSTION APPLICATIONS

W. Balachandran
University of Surrey, Surrey, England

D. Hu
University of Surrey, Surrey, England

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

John S. Shrimpton
Energy Technology Research Group, School of Engineering Sciences, University of Southampton, United Kingdom, SO171BJ

A. Paul Watkins
Energy and Multiphysics Research Group, School of Mechanical, Aerospace, and Civil Engineer- ing, University of Manchester, United Kingdom

Abstract

A charge injection nozzle suitable for package burner applications has been designed and tested, spraying insulating liquids such as kerosene, diesel or white spirit. The nozzle consists of a sharp pointed needle as a charge injector and a shaped nozzle body as an anode and extractor. A systematic experimental study together with numerical modelling has been carried out to optimise the nozzle and establish the basis for the theoretical study. The prediction of the atomization process is based on a better understanding of the charge injection mechanism. The charge injection from the needle tip is assumed to be not only by field emission but also by the creation of ions produced by dissociation of ion pairs from ionic compound or neutral molecules under a strong electric field. A description of the atomization characteristics using semi-empirical expressions which take account of the liquid volume flow rate and charge carrier mobility can give a prediction of the liquid breakup length which agrees well with the experimental results.