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Electrostatically atomized hydrocarbon sprays

Electrostatically atomized hydrocarbon sprays
Electrostatically atomized hydrocarbon sprays
A burner using an electrostatic method to produce and control a fuel spray is investigated for non-burning sprays. The burner has a charge injection nozzle and the liquid flow rate and charge injection rate are varied using hydrocarbon liquids of differing viscosities, surface tensions and electrical conductivities (kerosene, white spirit and diesel oil). Droplet size distributions are measured and it is shown how the dropsize, spray pattern, breakup mechanism and breakup length depend on the above variables, and in particular on the specific charge achieved in the spray. The data are valuable for validating two computer models under development. One predicts the electric field and flow field inside the nozzle as a function of emitter potential, geometry and flow rate. The other predicts the effect of charge on spray dispersion, with a view to optimizing spray combustion. It is shown that electrostatic disruptive forces can be used to atomize oils at flow rates commensurate with practical combustion systems and that the charge injection technique is particularly suitable for highly resistive liquids. Possible limitations requiring further research include the need to control the wide spray angle, which may provide fuel-air mixtures too lean near the nozzle, and the need to design for maximum charge injection rate, which is thought to be limited by corona breakdown in the gas near the nozzle orifice.
1094-1103
Yule, A.J.
45276620-a706-415d-a4b7-a9afeb8523e0
Shrimpton, J.S.
9cf82d2e-2f00-4ddf-bd19-9aff443784af
Watkins, A.P.
94f23fc5-7f82-4463-b92c-7f6e06e12406
Balachandran, W.
ee6f6721-497a-47ef-9c21-4cf16395e961
Hu, D.
c98496d2-6de0-489c-865e-5bd192679fc9
Yule, A.J.
45276620-a706-415d-a4b7-a9afeb8523e0
Shrimpton, J.S.
9cf82d2e-2f00-4ddf-bd19-9aff443784af
Watkins, A.P.
94f23fc5-7f82-4463-b92c-7f6e06e12406
Balachandran, W.
ee6f6721-497a-47ef-9c21-4cf16395e961
Hu, D.
c98496d2-6de0-489c-865e-5bd192679fc9

Yule, A.J., Shrimpton, J.S., Watkins, A.P., Balachandran, W. and Hu, D. (1995) Electrostatically atomized hydrocarbon sprays. Fuel, 74 (7), 1094-1103. (doi:10.1016/0016-2361(95)00037-6).

Record type: Article

Abstract

A burner using an electrostatic method to produce and control a fuel spray is investigated for non-burning sprays. The burner has a charge injection nozzle and the liquid flow rate and charge injection rate are varied using hydrocarbon liquids of differing viscosities, surface tensions and electrical conductivities (kerosene, white spirit and diesel oil). Droplet size distributions are measured and it is shown how the dropsize, spray pattern, breakup mechanism and breakup length depend on the above variables, and in particular on the specific charge achieved in the spray. The data are valuable for validating two computer models under development. One predicts the electric field and flow field inside the nozzle as a function of emitter potential, geometry and flow rate. The other predicts the effect of charge on spray dispersion, with a view to optimizing spray combustion. It is shown that electrostatic disruptive forces can be used to atomize oils at flow rates commensurate with practical combustion systems and that the charge injection technique is particularly suitable for highly resistive liquids. Possible limitations requiring further research include the need to control the wide spray angle, which may provide fuel-air mixtures too lean near the nozzle, and the need to design for maximum charge injection rate, which is thought to be limited by corona breakdown in the gas near the nozzle orifice.

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Published date: July 1995

Identifiers

Local EPrints ID: 64142
URI: http://eprints.soton.ac.uk/id/eprint/64142
PURE UUID: 8d19508a-0f70-4816-a98e-c699f367413e

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Date deposited: 23 Dec 2008
Last modified: 15 Mar 2024 11:46

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Contributors

Author: A.J. Yule
Author: J.S. Shrimpton
Author: A.P. Watkins
Author: W. Balachandran
Author: D. Hu

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