S054053 Boundary Layer Receptivity to Localized External Disturbances Generated by a 2D Airfoil with Jets

2013 ◽  
Vol 2013 (0) ◽  
pp. _S054053-1-_S054053-5
Author(s):  
Hayato HIROTA ◽  
Tasuku KATO ◽  
Masaya SHIGETA ◽  
Seiichiro IZAWA ◽  
Yu FUKUNISHI
Keyword(s):  
Boundary Layer ◽  
External Disturbances ◽  
2D Airfoil

Studies on Bypass Transition of a Boundary Layer Subjected to Localized Periodic External Disturbances

2004 ◽  
Author(s):  
K. Funazaki ◽  
Y. Wakita ◽  
T. Otsuki
Keyword(s):  
Boundary Layer ◽  
Flat Plate ◽  
External Disturbance ◽  
Transition Process ◽  
Bypass Transition ◽  
Hot Wire ◽  
Turbulent Spot ◽  
External Disturbances ◽  
Small Sphere ◽  
Probe Sensor

This study aims at clarification of wake-induced bypass transition process of a boundary layer on a flat plate with no pressure gradient. Special attention is paid to inception as well as growth of a turbulent spot created by the incoming wake as an external disturbance. To meet this goal a unique wake generator is invented to create an isolated turbulent spot. A multi-probe sensor with seven single-hot-wire probes is used to measure wake-affected boundary layer. The wake generator consists of a disk, pillars and a very thin wire with a small sphere on it. The sphere on the wire generates periodic wakes behind it when it passes across the main flow in front of the test flat plate. These sphere wakes impinge the flat plate in a spatially and timewisely localized manner so that the wakes periodically leave narrow affected zones inside the boundary layer. The observations confirm that an isolated turbulence spot emerges from each of those wake-affected zones. It is also found that the turbulent spot observed in this study bears a close resemblance to the conventional turbulent spot that takes a shape of arrowhead pointing downstream.

G301 Influence of the External Disturbances on Boundary-Layer Transition

2007 ◽  
Vol 2007 (0) ◽  
pp. _G301-a_
Author(s):  
Ken SHIMIZU ◽  
Naoko TOKUGAWA ◽  
Hitoshi ISHIKAWA ◽  
Takuto ISSHIKI ◽  
Ryotaro KAWAMOTO
Keyword(s):  
Boundary Layer ◽  
Boundary Layer Transition ◽  
External Disturbances ◽  
Layer Transition

Boundary-layer receptivity to external disturbances using multiple scales

Meccanica ◽  
2013 ◽  
Vol 49 (2) ◽  
pp. 441-467 ◽  
Author(s):  
Simone Zuccher ◽  
Paolo Luchini
Keyword(s):  
Boundary Layer ◽  
Multiple Scales ◽  
External Disturbances

G301 Influence of the External Disturbances on Boundary-Layer Transition

2007 ◽  
Vol 2007 (0) ◽  
pp. _G301-1_-_G301-4_
Author(s):  
Ken SHIMIZU ◽  
Naoko TOKUGAWA ◽  
Hitoshi ISHIKAWA ◽  
Takuto ISSHIKI ◽  
Ryotaro KAWAMOTO
Keyword(s):  
Boundary Layer ◽  
Boundary Layer Transition ◽  
External Disturbances ◽  
Layer Transition
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