NDLI: On the Three-Dimensional Structure of Turbulent Spots

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Chong, T. P. Zhong, S.
Copyright Year	2003
Abstract	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.
Sponsorship	International Gas Turbine Institute
Starting Page	789
Ending Page	797
Page Count	9
File Format	PDF
ISBN	0791836886
DOI	10.1115/GT2003-38435
e-ISBN	0791836711
Volume Number	Volume 5: Turbo Expo 2003, Parts A and B
Conference Proceedings	ASME Turbo Expo 2003, collocated with the 2003 International Joint Power Generation Conference
Language	English
Publisher Date	2003-06-16
Publisher Place	Atlanta, Georgia, USA
Access Restriction	Subscribed
Subject Keyword	Turbulence Turbine blades Flat plates Skin friction (fluid dynamics) Pressure gradient Wire Probes Boundary layers Heat transfer
Content Type	Text
Resource Type	Article

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