Construction of three-dimensional flow structure out of two-dimensional steady flow field velocity measurements |
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Authors: | N Lang W Limberg |
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Institution: | Aerodynamisches Institut, Rheinisch-Westf?lische-Technische Hochschule Aachen Wüllnerstr. zw. 5 u. 7, D-52062 Aachen, Germany, DE
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Abstract: | Two-dimensional particle image velocimetry (PIV) is used to obtain a set of parallel vector maps in spanwise direction over
the delta wing configuration ELAC. The out-of-plane velocity component is then constructed by application of continuity equation.
This yields the whole three-dimensional separated flow field over the leeward side of the model. The spatial resolution of
the measurements enables a detailed examination of the three-dimensional flow structure. The growth and the helical structure
of primary vortex as well as smaller flow structures caused by secondary separation can be observed. Accuracy of the constructed
velocity component is estimated with help of a numerically obtained three-dimensional dataset of the flow field around this
configuration. The reconstruction procedure was applied to this data set taking the experimental uncertainty and the grid
spacing of the PIV measurements into consideration. A comparison of reconstructed out-of-plane component and data of the numerical
solution of Navier–Stokes equations results in a promising low error. A statistical analysis of different procedures allows
interpretation of reconstruction capabilities.
Received: 15 April 1998 / Accepted: 15 September 1998 |
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