Abstract
A parametric study has been performed with jet vortex generators to determine their effectiveness in controlling flow separation associated with low-speed turbulent flow over a two-dimensional rearward-facing ramp. Results indicate that flow-separation control can be accomplished, with the level of control achieved being a function of jet speed, jet orientation (with respect to the free-stream direction), and jet location (distance from the separation region in the free-stream direction). Compared to slot blowing, jet vortex generators can provide an equivalent level of flow control over a larger spanwise region (for constant jet flow area and speed).
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Abbreviations
- C p :
-
pressure coefficient, 2(P-P∞)/ϱV 2∞
- C Q :
-
total flow coefficient, Q/δ λ v ∞
- D 0 :
-
jet orifice diameter
- Q :
-
total volumetric flow rate
- R θ :
-
Reynolds number based on momentum thickness
- u′ :
-
fluctuating velocity component in the free-stream (x) direction
- V ∞ :
-
free-stream flow speed
- VR :
-
ratio of jet speed to free-stream flow speed
- x :
-
coordinate along the wall in the free-stream direction
- α :
-
jet inclination angle (angle between the jet axis and the wall)
- β :
-
jet azimuthal angle (angle between the jet axis and the free-stream direction in a horizontal plane)
- δ :
-
boundary-layer thickness
- θ :
-
momentum thickness
- λ :
-
lateral distance between jet orifices
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Selby, G.V., Lin, J.C. & Howard, F.G. Control of low-speed turbulent separated flow using jet vortex generators. Experiments in Fluids 12, 394–400 (1992). https://doi.org/10.1007/BF00193886
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DOI: https://doi.org/10.1007/BF00193886