scholarly journals HIFiRE-5b Boundary-Layer Transition Length and Turbulent Overshoot

2021 ◽  
pp. 1-19
Author(s):  
Thomas J. Juliano ◽  
Joseph S. Jewell ◽  
Roger L. Kimmel
Keyword(s):  
Boundary Layer ◽  
Boundary Layer Transition ◽  
Layer Transition ◽  
Transition Length

Measurement of Transitional Surface Roughness Effects on Flat-Plate Boundary Layer Transition

2019 ◽  
Vol 141 (7) ◽  
Author(s):  
Heechan Jeong ◽  
Seung Woo Lee ◽  
Seung Jin Song
Keyword(s):  
Boundary Layer ◽  
Surface Roughness ◽  
Turbulence Intensity ◽  
Plate Boundary ◽  
Boundary Layer Transition ◽  
Mean Velocity ◽  
Layer Transition ◽  
Turbulence Intermittency ◽  
Transition Length ◽  
Flat Plate Boundary Layer

An experimental study has been conducted to investigate the effects of transitionally rough surface on the flat-plate boundary layer transition. Transitional boundary layers with three different flat plates (ks+ = 0.07 ∼ 0.19, 2.71 ∼ 7.05, and 13.65 ∼ 41.09) have been measured with a single-sensor hot-wire probe. All of the measurements have been conducted under zero pressure gradient (ZPG) at the fixed Reynolds number (ReL) and freestream turbulence intensity (Tu) of 3.05 × 106 and 0.2%. Transitionally, rough surface does not affect the sigmoidal distribution of turbulence intermittency model; but induces earlier transition onset and shortens the transition length. For all surfaces, streamwise turbulence intensity profiles with similar values of turbulence intermittency are similar for the transition length less than 60%. Therefore, mean velocity profiles with the similar values of turbulence intermittency are similar regardless of surface conditions. However, downstream of 60% of the transition length, mean velocity defect increases as the surface roughness increases. Enhanced diffusion of turbulent kinetic energy from the near wall (y/δ < 0.1) to the outer part (y/δ ≈ 0.4) of the boundary layer due to the surface roughness is responsible for the increased momentum deficit.

End-Stage Boundary Layer Transition Models for Engineering Calculations

1994 ◽  
Vol 208 (1) ◽  
pp. 47-58 ◽  
Author(s):  
C J Fraser ◽  
M G Higazy ◽  
J S Milne
Keyword(s):  
Boundary Layer ◽  
Formation Rate ◽  
Transition Process ◽  
Computer Code ◽  
Boundary Layer Transition ◽  
Layer Transition ◽  
Practical Engineering ◽  
Transition Length ◽  
End Stage ◽  
Spot Formation

The paper presents some recent new data on the combined effects of pressure gradient and freestream turbulence level on the onset and length of the latter stages of the boundary layer transition process. Generalized correlations for the transition length Reynolds number are developed from considerations of the non-dimensional turbulent spot formation rate. The optimized correlation is built into a popular linear combination integral computer code to predict the growth of the transitional boundary layer in a number of practical engineering flows.

EXPERIMENTAL AND NUMERICAL INVESTIGATIONS OF BOUNDARY LAYER TRANSITION ON BLUNTED CONES AT SUPERSONIC FLOW

2010 ◽  
Vol 40 (3) ◽  
pp. 309-319 ◽  
Author(s):  
V. N. Brazhko ◽  
A. V. Vaganov ◽  
N. A. Kovaleva ◽  
N. P. Kolina ◽  
I. I. Lipatov
Keyword(s):  
Boundary Layer ◽  
Supersonic Flow ◽  
Boundary Layer Transition ◽  
Layer Transition ◽  
Numerical Investigations

Automatic control of laminar boundary-layer transition

AIAA Journal ◽  
1997 ◽  
Vol 35 ◽  
pp. 85-90
Author(s):  
P. A. Nelson ◽  
M. C. M. Wright ◽  
J.-L. Rioual
Keyword(s):  
Boundary Layer ◽  
Automatic Control ◽  
Laminar Boundary Layer ◽  
Boundary Layer Transition ◽  
Layer Transition
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