Particle Redistribution in Serpentine Engine Inlets

Particle Redistribution in Serpentine Engine Inlets

Bibliographic Details
Main Author: Potts, Ian
Language:English
Published: The Ohio State University / OhioLINK 2020
Subjects:
Aerospace Engineering
Mechanical Engineering
S duct
offset diffuser
particle ingestion
particle redistribution
CFD
Online Access:http://rave.ohiolink.edu/etdc/view?acc_num=osu1595542100917769
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spelling ndltd-OhioLink-oai-etd.ohiolink.edu-osu15955421009177692021-08-03T07:15:53Z Particle Redistribution in Serpentine Engine Inlets Potts, Ian Aerospace Engineering Mechanical Engineering S duct offset diffuser particle ingestion particle redistribution CFD This numerical study investigates particle trajectories, impacts, and rebounds in two serpentine inlets. One has been designed for boundary layer ingestion (BLI) and commercial application, with a long length-to-diameter ratio, while the other has more aggressive turns, typical of a single-engine fighter aircraft. Using ANSYS Fluent, computational models of the two inlets are subjected to a flow field representative of an aircraft climbing after takeoff, a point where particle ingesting can readily occur. A range of particle diameters, 1-100 microns, are then injected with the engine inlet flow slipstream well upstream of the actual inlet using an Eulerian-Lagrangian tracking scheme through a steady RANS solution. The effect of flow turbulence on particle trajectories is incorporated through the discrete random walk model.The OSU Deposition model is used to predict rebounds and their trajectories. The model accounts for elastic and plastic deformation of a particle, as well as adhesion, shear removal, and reentrainment into the flow. Particle trajectories and spatial distributions are shown to have a strong diameter dependence. Larger particles impact the inlet upper wall ballistically, while small particles are affected by the secondary flows that develop within the inlet. The larger particles become concentrated at the AIP, with the Military inlet showing higher concentrations and a broader range of particle diameters becoming concentrated than the Commercial inlet (4-5x vs 2-3x concentration levels & >20 microns vs. >25 microns, respectively). Smaller particles can become entrained in the secondary flows that develop, changing the velocity and incidence angle when they reach the fan, which would change anticipated erosion rates. More than 50% of particles >40 microns impact inside the Military inlet, while the Commercial inlet only sees a 50% impact rate for 100 micron particles. Similarly, the Military inlet sees more than 50% of ingested particles >75 microns rebound multiple times through the duct, while the Commercial inlet never sees any diameter have more than 10% of secondary impacts. 2020 English text The Ohio State University / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=osu1595542100917769 http://rave.ohiolink.edu/etdc/view?acc_num=osu1595542100917769 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws.
collection NDLTD
language English
sources NDLTD
topic Aerospace Engineering
Mechanical Engineering
S duct
offset diffuser
particle ingestion
particle redistribution
CFD
spellingShingle Aerospace Engineering
Mechanical Engineering
S duct
offset diffuser
particle ingestion
particle redistribution
CFD
Potts, Ian
Particle Redistribution in Serpentine Engine Inlets
author Potts, Ian
author_facet Potts, Ian
author_sort Potts, Ian
title Particle Redistribution in Serpentine Engine Inlets
title_short Particle Redistribution in Serpentine Engine Inlets
title_full Particle Redistribution in Serpentine Engine Inlets
title_fullStr Particle Redistribution in Serpentine Engine Inlets
title_full_unstemmed Particle Redistribution in Serpentine Engine Inlets
title_sort particle redistribution in serpentine engine inlets
publisher The Ohio State University / OhioLINK
publishDate 2020
url http://rave.ohiolink.edu/etdc/view?acc_num=osu1595542100917769
work_keys_str_mv AT pottsian particleredistributioninserpentineengineinlets
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