End-wall secondary flow control using engineered residual surface structure

Miao, X., Zhang, Q., Atkin, C. ORCID: https://orcid.org/0000-0003-2529-1978 and Sun, Z. (2016) End-wall secondary flow control using engineered residual surface structure. In: Proceedings of the ASME Turbo Expo: Turbine Technical Conference and Exposition, 2016, Vol. 2B. American Society of Mechanical Engineers (ASME), KOR. ISBN 978-0-7918-4970-5

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Residual surface roughness is often introduced in the manufacture process with ball-end or fillet-end milling. Instead of paying extra cost to remove these small-scale residual surface structures, there is a potential usage of them as flow control device. This numerical study therefore explores the ability of engineered surface structure in controlling the end wall secondary flow in turbomachinery. The CFD method is validated against the existing experimental data obtained for a 90 degree turning duct flow with a single rib fence placed on the end-wall. The working principle of the engineered surface structure is revealed through detailed analysis on the flow produced by multiple small fences and grooves mimicking the residual surface. The results consistently show that addition of engineered residual structure on flow surface can effectively reduce the magnitude of stream-wise vorticity associated with secondary flow and alleviate its lift-off motion. In the end, a general working mechanism and design guideline for optimizing the residual structure are summarized.

Item Type: Book Section
Uncontrolled Keywords: boundary-layer fences,optimization,losses,design,duct
Depositing User: LivePure Connector
Date Deposited: 29 May 2020 23:34
Last Modified: 22 Oct 2022 23:52
URI: https://ueaeprints.uea.ac.uk/id/eprint/75392

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