Investigation of surface deposition in a simulated fuel injector feed arm with sudden expansion/contraction

Abstract

Article:Alborzi, E., Blakey, S., Ghadbeigi, H. orcid.org/0000-0001-6507-2353 et al. (2 more authors) (2016) Investigation of surface deposition in a simulated fuel injector feed arm with sudden expansion/contraction. Fuel, 186. pp. 534-543. ISSN 0016-2361 https://doi.org/10.1016/j.fuel.2016.08.080Article available under the terms of the CC-BY-NC-ND licence (https://creativecommons.org/licenses/by-nc-nd/4.0/) eprints@whiterose.ac.uk https://eprints.whiterose.ac.uk/ Reuse Unless indicated otherwise, fulltext items are protected by copyright with all rights reserved. The copyright exception in section 29 of the Copyright, Designs and Patents Act 1988 allows the making of a single copy solely for the purpose of non-commercial research or private study within the limits of fair dealing. The publisher or other rights-holder may allow further reproduction and re-use of this version -refer to the White Rose Research Online record for this item. Where records identify the publisher as the copyright holder, users can verify any specific terms of use on the publisher's website. TakedownIf you consider content in White Rose Research Online to be in breach of UK law, please notify us by emailing eprints@whiterose.ac.uk including the URL of the record and the reason for the withdrawal request. Investigation of Surface Deposition in a Simulated AbstractFormation of surface carbonaceous deposits at inner surface of two classes of simulated jet engine burner feed arm including a straight tube as well as two tubes with sudden expansion/contraction was studied using "Aviation Fuel Thermal Stability Test Unit(AFTSTU)". The generated results indicate that phenomena such as stagnant flow formation, flow separation and vena contracta have a substantial impact on surface deposition. Commercial "Computational Fluid Dynamics(CFD)"package, ANSYS Fluent was used to interpret the impact of flow features and heat transfer characteristics on surface deposition. The experimental data obtained in this work were used in a one dimensional heat transfer model for prediction of deposit thickness in simulated burner feed arms. Subsequently, the simulated burner feed arm with contraction/expansion structure were sectioned and prepared for deposit visualisation with "Scanning Electron Microscopy(SEM)". The results of visualised deposits are consistent with one dimensional heat transfer calculation.The novel set of experimental data presented in this work provides a basis for the construction of predictive models for calculation of deposit growth and total deposit mass in fuel injection system. A description of the model will be addressed in the second paper of this work which is currently under preparation. a an empirical correction factor based on previous experimental data h f uel convective heat transfer coefficient of jet fuel(W/m 2 K) KeywordsT 0 wall temperature at time zero(k)T t wall temperature at time t(K)T bulk bulk fuel temperature(k)

Comparative Study of the Effect of Fuel Deoxygenation and Polar Species Removal on Jet Fuel Surface Deposition

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“…A number of studies have investigated the conductivity of typical deposits found in aviation fuel autoxidation test rigs of a range of scales. TeVelde and Glickstien [23] reported a strong variation in deposit conductivity with deposit thickness between 20 µm and 25 µm varying by an order of magnitude from 0.017W/m 2 K to 0.17W/m 2 K. Earlier experimental work on sectioned tubes from the AFT-STU [4] has suggested an estimated thermal conductivity of to 0.012W/m 2 K would be appropriate and was validated against microscope assessment of sectioned tubes from the rig. This agrees well with the work of Tevelde and Glickstein as the deposit was below 20 µm for the majority of the testing work.…”