Diffuser flows have been investigated with different riblet combinations both experimentally and numerically. Wall pressures and velocity profiles have been measured throughout a large working domain. In addition numerical calculations have been performed by accounting for the strong coupling between the inviscid core flow and the viscous boundary layer flows by using a simple model based on the negative roughness for the riblet walls.
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- c f :
skin friction coefficient
- p :
local static pressure
- x :
- y :
distance normal to the wall
- u τ :
- A :
diffuser cross section
- H :
- U e :
fluid velocity in inviscid flow
- W 1 :
inlet height of the diffuser
boundary layer displacement thickness
- ϱ :
density of working fluid
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Institut de Machines Hydrauliques et de Mecanique des Fluides
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Truong, T.V., Pulvin, P. Influence of wall riblets on diffuser flow. Applied Scientific Research 46, 217–227 (1989). https://doi.org/10.1007/BF00404819
- Boundary Layer
- Simple Model
- Numerical Calculation
- Velocity Profile
- Strong Coupling