Combined smoke-flow visualisation and hot-wire anemometry in turbulent boundary layers

2008 ◽  
pp. 205-216
Author(s):  
P. Bandyopadhyay
Keyword(s):  
Boundary Layers ◽  
Turbulent Boundary Layers ◽  
Flow Visualisation ◽  
Hot Wire ◽  
Smoke Flow ◽  
Hot Wire Anemometry

Experimental Studies on Wake-Induced Transition of Turbulent Boundary Layers

2012 ◽  
Author(s):  
Keiji Takeuchi ◽  
Susumu Fujimoto ◽  
Eitaro Koyabu ◽  
Tetsuhiro Tsukiji
Keyword(s):  
Boundary Layer ◽  
Flat Plate ◽  
Boundary Layers ◽  
Turbulence Intensity ◽  
Intensity Distribution ◽  
Experimental Studies ◽  
Turbulent Boundary Layers ◽  
Bypass Transition ◽  
Pressure Gradients ◽  
Hot Wire

Wake-induced bypass transition of boundary layers on a flat plate subjected to favorable and adverse pressure gradients was investigated. Detailed boundary layer measurements were conducted using two hot-wire probes. A spoked-wheel-type wake generator was used to create periodic wakes in front of the flat plate. The main focus of this study was to reveal the effect of the Strouhal number, which changed by using different numbers of wake-generating bars, on the turbulence intensity distribution and the transition onset position of the boundary layer on the flat plate using two hot-wire probes.

scholarly journals A wall-wake model for the turbulence structure of boundary layers. Part 2. Further experimental support

1995 ◽  
Vol 298 ◽  
pp. 389-407 ◽  
Author(s):  
Ivan Marušić ◽  
A. E. Perry
Keyword(s):  
Boundary Layers ◽  
Cone Angle ◽  
Power Spectra ◽  
Turbulent Boundary Layers ◽  
Turbulence Structure ◽  
Reynolds Stresses ◽  
Hot Wire ◽  
Equilibrium Pressure ◽  
Extended Theory ◽  
Wake Model

In Part 1 an extension of the attached eddy hypothesis was developed and applied to equilibrium pressure gradient turbulent boundary layers. In this paper the formulation is applied to data measured by the authors from non-equilibrium layers and agreement with the extended theory is encouraging. Also power spectra of the Reynolds stresses as developed from the extended theory compare favourably with experiment. The experimental data include a check of cone-angle effects by using a flying hot wire.

Local isotropy in complex turbulent boundary layers at high Reynolds number

1997 ◽  
Vol 348 ◽  
pp. 201-245 ◽  
Author(s):  
SEYED G. SADDOUGHI
Keyword(s):  
Boundary Layer ◽  
Boundary Layers ◽  
High Reynolds Number ◽  
Reynolds Numbers ◽  
Turbulent Boundary Layers ◽  
Hot Wire ◽  
Local Isotropy ◽  
Velocity Fluctuations ◽  
Nasa Ames Research ◽  
High Reynolds

To continue our (Saddoughi & Veeravalli 1994) tests of the local-isotropy predictions of Kolmogorov's (1941) universal equilibrium theory in shear flows, we have taken hot-wire measurements of the velocity fluctuations in complex turbulent boundary layers at several Reynolds numbers. We have studied the plane-of-symmetry flow upstream of a 4 ft diameter, 6 ft long circular cylinder placed with its axis vertical in the zero-pressure-gradient turbulent boundary layer of the test-section ceiling in the 80 ft x 120 ft Full-Scale Aerodynamics Facility at NASA Ames Research Center.

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