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Importance of surface curvature in modelling droplet impingement on fan blades

Importance of surface curvature in modelling droplet impingement on fan blades
Importance of surface curvature in modelling droplet impingement on fan blades
When modeling a droplet impingement, it is reasonable to assume a surface is flat when the radius of curvature of the surface is significantly larger than the droplet radius. In other contexts where water droplet erosion (WDE) has been investigated, the typical droplet size has either been sufficiently small, or the radius of curvature of the surface sufficiently large, that it has been sensible to make this assumption. The equations describing the kinematics of an impinging water droplet on a flat surface were reformulated for a curved surface. The results suggest the relatively similar radii of curvature, of the leading-edge of a fan blade and the impinging water droplet, will significantly affect the application of the initial high-pressures, along with the onset of lateral outflow jetting. Jetting is predicted to commence substantially sooner and not in unison along the contact periphery, leading to an asymmetric flow stage. This is likely to have significant implications for the WDE that occurs, and thus, the engineering approaches to minimize the WDE of fan blades.
surface curvature, modelling, droplet impingement, fan blades
0742-4795
1-9
Burson-Thomas, Charles B.
a02c68a7-4447-4b03-abd5-41ca055cab24
Wellman, Richard
933354f5-e4ff-448e-b6b5-4caef14187a4
Harvey, Terry J.
3b94322b-18da-4de8-b1af-56d202677e04
Wood, Robert J.K.
d9523d31-41a8-459a-8831-70e29ffe8a73
Burson-Thomas, Charles B.
a02c68a7-4447-4b03-abd5-41ca055cab24
Wellman, Richard
933354f5-e4ff-448e-b6b5-4caef14187a4
Harvey, Terry J.
3b94322b-18da-4de8-b1af-56d202677e04
Wood, Robert J.K.
d9523d31-41a8-459a-8831-70e29ffe8a73

Burson-Thomas, Charles B., Wellman, Richard, Harvey, Terry J. and Wood, Robert J.K. (2019) Importance of surface curvature in modelling droplet impingement on fan blades. Journal of Engineering for Gas Turbines and Power, 141 (3), 1-9. (doi:10.1115/1.4041149).

Record type: Article

Abstract

When modeling a droplet impingement, it is reasonable to assume a surface is flat when the radius of curvature of the surface is significantly larger than the droplet radius. In other contexts where water droplet erosion (WDE) has been investigated, the typical droplet size has either been sufficiently small, or the radius of curvature of the surface sufficiently large, that it has been sensible to make this assumption. The equations describing the kinematics of an impinging water droplet on a flat surface were reformulated for a curved surface. The results suggest the relatively similar radii of curvature, of the leading-edge of a fan blade and the impinging water droplet, will significantly affect the application of the initial high-pressures, along with the onset of lateral outflow jetting. Jetting is predicted to commence substantially sooner and not in unison along the contact periphery, leading to an asymmetric flow stage. This is likely to have significant implications for the WDE that occurs, and thus, the engineering approaches to minimize the WDE of fan blades.

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GTP-18-1402 - Accepted Manuscript
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Accepted/In Press date: 23 July 2018
e-pub ahead of print date: 4 October 2018
Published date: March 2019
Keywords: surface curvature, modelling, droplet impingement, fan blades

Identifiers

Local EPrints ID: 425506
URI: https://eprints.soton.ac.uk/id/eprint/425506
ISSN: 0742-4795
PURE UUID: c4bf012d-fe6e-4304-85dd-b622657525bf
ORCID for Robert J.K. Wood: ORCID iD orcid.org/0000-0003-0681-9239

Catalogue record

Date deposited: 22 Oct 2018 16:30
Last modified: 20 Jul 2019 01:19

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