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Heat transfer and residence time in lean direct injection fuel galleries

journal contribution
posted on 21.07.2021, 08:42 by Tom Walker, Graham Peacock, Mark Brend, Clare Bonham, Jon Masters
In radially staged lean direct injection systems, pilot fuel plays an important role in cooling the mains fuel gallery in regions of the flight envelope where the mains fuel is stagnant. Under these conditions, managing wetted wall temperatures is vital to avoid the formation of carbonaceous particles, which become deposited on the surfaces of the fuel gallery and can lead to a deterioration in system performance. The prediction of wetted wall temperatures therefore represents an important aspect of the injector design phase. Such predictions are often based on injector thermal models, which tend to rely on the application of convective boundary conditions from empirical heat transfer correlations. The use of these correlations leads to questions over the accuracy of predicted wetted wall temperatures and therefore uncertainty over the probability of deposition. This paper seeks to improve on the current situation by applying the inverse conduction technique to determine heat transfer coefficients specific to the pilot fuel gallery. These heat transfer coefficients are crucial for determining wetted wall temperatures in the pilot and mains fuel galleries and principally govern the risk of deposition in the stagnant mains. The pilot heat transfer data is further examined alongside measurements of the pilot residence time distribution, which together control the risk of pilot deposition at low fuel flow rates. Both the heat transfer and residence time measurements demonstrate the opportunity for future fuel gallery design refinement and provide the supporting data to facilitate this.

Funding

This research was funded by the UK Aerospace Technology Institute and Rolls-Royce plc. as part of the ELECT project.

History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Aeronautical and Automotive Engineering

Published in

Journal of Engineering for Gas Turbines and Power

Publisher

American Society of Mechanical Engineers

Version

AM (Accepted Manuscript)

Rights holder

© ASME

Publisher statement

This paper was accepted for publication in the journal Journal of Engineering for Gas Turbines and Power and the definitive published version is available at [insert DOI link].

Acceptance date

14/07/2021

ISSN

0742-4795

eISSN

1528-8919

Language

en

Depositor

Dr Clare Bonham. Deposit date: 20 July 2021

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Loughborough Publications

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