Effect of surface roughness on blunt body boundary-layer transition

1977 ◽  
Vol 14 (4) ◽  
pp. 253-255 ◽  
Author(s):  
A. J. Laderman
Keyword(s):  
Boundary Layer ◽  
Surface Roughness ◽  
Blunt Body ◽  
Boundary Layer Transition ◽  
Layer Transition ◽  
Body Boundary ◽  
Effect Of Surface

Effect of Surface Roughness on Conjugate Heat Transfer of a Turbine Vane

2016 ◽  
Author(s):  
Hongyang Li ◽  
Yun Zheng
Keyword(s):  
Heat Transfer ◽  
Boundary Layer ◽  
Surface Roughness ◽  
Suction Side ◽  
Transition Process ◽  
Considerable Effect ◽  
Boundary Layer Transition ◽  
Layer Transition ◽  
Turbine Vane ◽  
Effect Of Surface

For the purpose of researching the effect of surface roughness on boundary layer transition and heat transfer of turbine blade, a roughness modification approach for γ-Reθ transition model was proposed based on an in-house CFD code. Taking surface roughness effect into consideration, No. 5411 working condition of Mark II turbine vane was simulated and the results were analyzed in detail. Main conclusions are as follows: Surface roughness has little effect on heat transfer of laminar boundary layer, while has considerable effect on turbulent boundary layer. Compared with smooth surface, equivalent sand roughness of 100μm increases the temperature for about 28.4K on suction side, reaching an increase of 5%. Under low roughness degree, effect of shock wave dominants on boundary layer transition process on suction side, while above the critical degree, effect of surface roughness could abruptly change the transition point.

scholarly journals Effect of Surface Roughness Geometry on Boundary-Layer Transition and Far-Field Noise

AIAA Journal ◽  
2021 ◽  
pp. 1-13
Author(s):  
Qingqing Ye ◽  
Francesco Avallone ◽  
Daniele Ragni ◽  
Meelan Choudhari ◽  
Damiano Casalino
Keyword(s):  
Boundary Layer ◽  
Surface Roughness ◽  
Boundary Layer Transition ◽  
Far Field ◽  
Layer Transition ◽  
Field Noise ◽  
Effect Of Surface

scholarly journals Effect of Surface Roughness on Boundary Layer Transition and Far Field Noise

2019 ◽  
Author(s):  
Qingqing Ye ◽  
Francesco Avallone ◽  
Daniele Ragni ◽  
Meelan M. Choudhari ◽  
Damiano Casalino
Keyword(s):  
Boundary Layer ◽  
Surface Roughness ◽  
Boundary Layer Transition ◽  
Far Field ◽  
Layer Transition ◽  
Field Noise ◽  
Effect Of Surface

A Review of Surface Roughness Effects in Gas Turbines

2010 ◽  
Vol 132 (2) ◽  
Author(s):  
J. P. Bons
Keyword(s):  
Heat Transfer ◽  
Boundary Layer ◽  
Surface Roughness ◽  
Gas Turbines ◽  
Engine Performance ◽  
Boundary Layer Transition ◽  
Roughness Effects ◽  
Layer Transition ◽  
Laminar Separation

The effects of surface roughness on gas turbine performance are reviewed based on publications in the open literature over the past 60 years. Empirical roughness correlations routinely employed for drag and heat transfer estimates are summarized and found wanting. No single correlation appears to capture all of the relevant physics for both engineered and service-related (e.g., wear or environmentally induced) roughness. Roughness influences engine performance by causing earlier boundary layer transition, increased boundary layer momentum loss (i.e., thickness), and/or flow separation. Roughness effects in the compressor and turbine are dependent on Reynolds number, roughness size, and to a lesser extent Mach number. At low Re, roughness can eliminate laminar separation bubbles (thus reducing loss) while at high Re (when the boundary layer is already turbulent), roughness can thicken the boundary layer to the point of separation (thus increasing loss). In the turbine, roughness has the added effect of augmenting convective heat transfer. While this is desirable in an internal turbine coolant channel, it is clearly undesirable on the external turbine surface. Recent advances in roughness modeling for computational fluid dynamics are also reviewed. The conclusion remains that considerable research is yet necessary to fully understand the role of roughness in gas turbines.

Aerodynamic heating with boundary layer transition and heat protection with mass addition on blunt body in hypersonic flows

1993 ◽  
Author(s):  
SHIGERU ASO ◽  
YUICHI KUMAMOTO ◽  
NOBUYUKI KONDO ◽  
YOSHIKO NAKAMURA ◽  
MASAYUKI KATAYAMA ◽  
...  
Keyword(s):  
Boundary Layer ◽  
Blunt Body ◽  
Hypersonic Flows ◽  
Boundary Layer Transition ◽  
Aerodynamic Heating ◽  
Layer Transition ◽  
Heat Protection
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