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Tomographic PIV in the near field of a swirl-stabilised fuel injector

conference contribution
posted on 19.07.2018, 13:57 authored by Adrian SpencerAdrian Spencer, Mark BrendMark Brend, Daniel ButcherDaniel Butcher, David Dunham, Liangta Cheng, David Hollis
The isothermal flow fields of injectors have undergone several computational and experimental investigations using point and planar measurement techniques,. Within the swirl induced vortex breakdown region it is only LES that has been able to predict fully the presence of a three dimensional helical vortex structure for a particular injector, and in certain conditions (no central fuel jet), a precessing vortex core. These structures can be elucidated from point and planar measurements and favorable comparisons of velocity statistics between experiment and LES predictions strengthen these findings. However, volumetric, 3-component measurement of velocity data has not been widely available to provide conclusive evidence of the exact three dimensional nature of the vortex structures that exist. An experimental setup utilizing time resolved tomographic PIV on a water flow rig is described in this paper. This is used to provide as high-quality aerodynamic study as possible of a single stream radially-fed air swirl gaseous fuel injector. The level of accuracy of the tomographic PIV technique is demonstrated by calculating the divergence of the velocity field as well as validating the results against a comprehensive 2 and 3 component standard PIV velocity database and other measurement techniques and predictions. Structure identification methods have been employed to visualise and understand the complex flow topology within the near field of the injector. The change in topology with and without the stabilising central jet is further investigated and agrees with findings of planar PIV results. While the velocity error associated with the tomo-PIV results is higher than the planar results the data agree well within the identified uncertainty bounds and are complimentary in understanding the flow field structure. Thus a full volumetric aerodynamic survey is available for the first time on this isothermal flow case.

Funding

The authors are grateful to LaVision UK, who loaned some equipment necessary for this work and helped in processing of the raw images into velocity fields, otherwise the new work reported was internally funded by Loughborough University.

History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Aeronautical and Automotive Engineering

Published in

ASME Turbo Expo

Citation

SPENCER, A. ... et al, 2018. Tomographic PIV in the near field of a swirl-stabilised fuel injector. Presented at the ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition, Oslo, Norway, 11-15 June 2018, Vol. 4A: Combustion, Fuels, and Emissions, Paper No. GT2018-75201, pp. V04AT04A010.

Publisher

© ASME

Version

AM (Accepted Manuscript)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Publication date

2018

Notes

This paper is closed access.

ISBN

9780791851050

Book series

ASME paper;GT2018-75201

Language

en

Location

Oslo, Norway.

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