Smart Suction — an Advanced Concept for Laminar Flow Control of Three-Dimensional Boundary Layers

2007 ◽  
pp. 53-60 ◽  
Author(s):  
Ralf Messing ◽  
Markus Kloker
Keyword(s):  
Laminar Flow ◽  
Flow Control ◽  
Boundary Layers ◽  
Three Dimensional ◽  
Dimensional Boundary ◽  
Laminar Flow Control

Passive control of transition in three-dimensional boundary layers, with emphasis on discrete roughness elements

2011 ◽  
Vol 369 (1940) ◽  
pp. 1352-1364 ◽  
Author(s):  
William S. Saric ◽  
Andrew L. Carpenter ◽  
Helen L. Reed
Keyword(s):  
Laminar Flow ◽  
Passive Control ◽  
Three Dimensional ◽  
Flight Test ◽  
Test Results ◽  
Swept Wing ◽  
Control Techniques ◽  
Roughness Elements ◽  
Dimensional Boundary ◽  
Laminar Flow Control

A brief review of laminar flow control techniques is given and a strategy for achieving laminarization for transonic transport aircraft is discussed. A review of some flight-test results on swept-wing transition is presented. It is also shown that polished leading edges can create large regions of laminar flow because the flight environment is relatively turbulence free and the surface finish reduces the initial amplitude of the stationary crossflow vortex.

Review: Laminar-to-Turbulent Transition of Three-Dimensional Boundary Layers on Rotating Bodies

1994 ◽  
Vol 116 (2) ◽  
pp. 200-211 ◽  
Author(s):  
Ryoji Kobayashi
Keyword(s):  
Boundary Layer ◽  
Boundary Layers ◽  
Three Dimensional ◽  
Speed Ratio ◽  
Stream Velocity ◽  
Turbulent Transition ◽  
Centrifugal Instability ◽  
Crossflow Instability ◽  
Dimensional Boundary ◽  
Axisymmetric Bodies

The laminar-turbulent transition of three-dimensional boundary layers is critically reviewed for some typical axisymmetric bodies rotating in still fluid or in axial flow. The flow structures of the transition regions are visualized. The transition phenomena are driven by the compound of the Tollmien-Schlichting instability, the crossflow instability, and the centrifugal instability. Experimental evidence is provided relating the critical and transition Reynolds numbers, defined in terms of the local velocity and the boundary layer momentum thickness, to the local rotational speed ratio, defined as the ratio of the circumferential speed to the free-stream velocity at the outer edge of the boundary layer, for the rotating disk, the rotating cone, the rotating sphere and other rotating axisymmetric bodies. It is shown that the cross-sectional structure of spiral vortices appearing in the transition regions and the flow pattern of the following secondary instability in the case of the crossflow instability are clearly different than those in the case of the centrifugal instability.

scholarly journals A Fundamental Study on Laminar Flow Control by Suction with Slits

1988 ◽  
Vol 1988 (163) ◽  
pp. 39-47
Author(s):  
Ichiro Tanaka ◽  
Matao Takagi ◽  
Masami Hikino ◽  
Tsuyoshi Kato ◽  
Hirotoshi Yanagi
Keyword(s):  
Laminar Flow ◽  
Flow Control ◽  
Fundamental Study ◽  
Laminar Flow Control
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