Recent Experimental Studies of High Speed Boundary Layer Transition in LENS Facilities to Further the Development of Predictive Tools for Boundary Layer Transition in Flight

2012 ◽  
Author(s):  
Tim Wadhams ◽  
Matthew MacLean ◽  
Michael Holden
Keyword(s):  
Boundary Layer ◽  
High Speed ◽  
Experimental Studies ◽  
Boundary Layer Transition ◽  
Layer Transition ◽  
Predictive Tools

Numerical Investigation of Guide-Plate Induced Pressure Fluctuations on Guide Vanes of Three Gorges Turbines

2011 ◽  
Vol 133 (6) ◽  
Author(s):  
Ting Chen ◽  
S. C. Li
Keyword(s):  
Boundary Layer ◽  
Vortex Structure ◽  
Free Stream ◽  
Experimental Studies ◽  
Boundary Layer Transition ◽  
Three Gorges ◽  
Layer Transition ◽  
Free Stream Turbulence ◽  
Numerical Studies ◽  
Guide Plate

A new type of cavitation triggered by boundary-layer turbulence-production has been identified from the turbines of the Three Gorges Power Station. Our previous studies point out that the addition of the ‘guide-plate’ is responsible for the increase of the turbulence level (in particular the low-frequency mode) in the free-stream which in turn promotes the boundary-layer transition through receptivity mechanism. A new vortex structure identified from our numerical studies is revealed in this paper. It explains well how the free-stream turbulence is influenced by this new vortex structure which is created by the addition of this ‘guide-plate’. These results support one of the claims in the hypothesis proposed in our previous studies. The other claims in the hypothesis about the triggering mechanism of this type of cavitation in the boundary-layer are being verified through our on-going (numerical and experimental) studies. The numerical studies reported here are performed by using CFD simulations of the entire flow passage of the prototype turbine.

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