Thermographic Detection of separated Flow

The Science of Making Torque from Wind

Dollinger, C.^1 ; Balaresque, N.^2 ; Schaffarczyk, A.P.^3 ; Fischer, A.^1

Bremen Institute for Metrology, Automation and Quality Science (BIMAQ), University of Bremen, Bremen, Germany^1

Deutsche WindGuard Engineering GmbH, Bremerhaven, Germany^2

Kiel University of Applied Sciences, Kiel, Germany^3

关键词: Information contents;    Laminar/turbulent transitions;    New approaches;    Separated flows;    Spatial temporals;    Thermographic detection;    Two-dimensional flow;    Wind tunnel measurements;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/753/7/072006/pdf
DOI  :  10.1088/1742-6596/753/7/072006

来源: IOP

【 摘 要 】

Thermographic wind tunnel measurements, both on a cylinder as well as on a 2D airfoil, were performed at various Reynolds numbers in order to evaluate the possibility of detecting and visualizing separated flow areas. A new approach by acquiring a series of thermographic images and applying a spatial-temporal statistical analysis allows improving both the resolution and the information content of the thermographic images. Separated flow regions become visible and laminar/turbulent transitions can be detected more accurately. The knowledge about possibly present stall cells can be used to confirm two-dimensional flow conditions and support the development of more effective and silent rotorblades.