Passive Device Flow Control for Normal Shock/Boundary Layer Interactions in External Compression Inlets

2011 ◽  
Author(s):  
Trajaen Troia ◽  
Amish Patel ◽  
Dick Crouse ◽  
Kelly Strominger ◽  
Gordon Hall ◽  
...  
Keyword(s):  
Boundary Layer ◽  
Flow Control ◽  
Normal Shock ◽  
External Compression ◽  
Passive Device

Microramp Flow Control of Normal Shock/Boundary-Layer Interactions

AIAA Journal ◽  
2010 ◽  
Vol 48 (11) ◽  
pp. 2529-2542 ◽  
Author(s):  
Thomas Herges ◽  
Erik Kroeker ◽  
Greg Elliott ◽  
Craig Dutton
Keyword(s):  
Boundary Layer ◽  
Flow Control ◽  
Normal Shock

On ramped vanes to control normal shock boundary layer interactions

2018 ◽  
Vol 122 (1256) ◽  
pp. 1568-1585 ◽  
Author(s):  
S. Lee ◽  
E. Loth
Keyword(s):  
Boundary Layer ◽  
Mach Number ◽  
Flow Control ◽  
Flow Separation ◽  
Shape Factor ◽  
Incompressible Flows ◽  
Numerical Study ◽  
Normal Shock ◽  
Wall Region ◽  
Literature Study

ABSTRACTA novel vortex generator design positioned upstream of a normal shock followed by a subsequent diffuser was investigated using large eddy simulations. In particular, “ramped-vane” flow control devices with three different heights relative to the incoming boundary layer thickness (0.34δ, 0.52δ and 0·75δ) were placed in a supersonic boundary layer with a freestream Mach number of 1.3 and a Reynolds number of 2400 based on the momentum thickness. This is the first numerical study to investigate the size effect of the ramped-vane for flow control device in terms of shape factor, flow separation and flow unsteadiness. The results showed that these devices generated strong streamwise vortices that entrained high-momentum fluid to the near-wall region and increased turbulent mixing. The devices also decreased shock-induced flow separation, which resulted in a higher downstream skin friction in the diffuser. In general, the largest ramped-vane (0.75δ) produced the largest reductions in flow separation, shape factor and overall unsteadiness. These results and a careful review of the literature study also determined the quantitative correlation of optimum VG height with Mach number, wherebyh/δ~1 is often optimum for incompressible flows while higher Mach numbers lead to small optimum heights, tending towards h/δ~0.45 atM=2.5.

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