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On the three-dimensional structure of turbulent spots

Record type: Conference or Workshop Item (Paper)

A detailed measurement of turbulent spots propagating in a laminar boundary layer over a flat plate was made at a zero pressure gradient and three favourable pressure gradients. Data were recorded across the span of turbulent spots at a number of streamwise locations along the plate using a hot-wire probe and surface-mounted hot films. This work aims at extending the existing studies that are largely based upon measurements made in the plane of symmetry of the spots and away from the wall and investigating the three-dimensional structure of turbulent spots and its dependence on streamwise pressure gradients. The results from the present experiment reveal some interesting aspects of the overall structure of the spots and the role that regions with negative velocity perturbations play in spanwise growth of turbulent spots. The presence of a spanwise overhang is also confirmed which is believed to be responsible for the smaller spreading angle of spots measured at the wall. This finding is expected to have important implications to the development of improved transition models which are used to predict heat transfer and skin friction for turbine blades.

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Citation

Chong, T.P. and Zhong, S. (2003) On the three-dimensional structure of turbulent spots In Proceedings of 2003 ASME Turbo Expo: Power for Land, Sea, and Air. American Society of Mechanical Engineers..

More information

Published date: 2003
Additional Information: GT2003-38435
Venue - Dates: 2003 ASME Turbo Expo: Power for Land, Sea, and Air, 2003-06-16 - 2003-06-19

Identifiers

Local EPrints ID: 10319
URI: http://eprints.soton.ac.uk/id/eprint/10319
PURE UUID: 551f8a4b-2b66-4c90-a6b2-c6a883fd19d3

Catalogue record

Date deposited: 07 Feb 2006
Last modified: 17 Jul 2017 17:07

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