New Results in Numerical and Experimental Fluid Mechanics V: by Daniel Reckzeh, Heinz Hansen (auth.), Prof. Dr. Hans-Josef PDF

By Daniel Reckzeh, Heinz Hansen (auth.), Prof. Dr. Hans-Josef Rath, Carsten Holze, Dr. Hans-Joachim Heinemann, Rolf Henke, Professor Dr. Heinz Hönlinger (eds.)

ISBN-10: 3540332863

ISBN-13: 9783540332862

ISBN-10: 3540332871

ISBN-13: 9783540332879

This quantity includes the contributions to the 14. Symposium of the STAB (German Aerospace Aerodynamics Association). during this organization all these German scientists and engineers from universities, examine institutions and are concerned, who're doing learn and undertaking paintings in numerical and experimental fluid mechanics and aerodynamics, generally for aerospace yet for different functions, too. a number of the contributions are proposing effects from nationwide and ecu neighborhood subsidized initiatives. the quantity offers a vast evaluate over the continued paintings during this box in Germany, with the subjects being high-aspect ratio wings, low aspect-ratio wings, bluff our bodies, laminar circulate keep watch over and transition, lively circulate keep watch over, hypersonic flows, aeroelasticity, aeroacoustics, mathematical basics/ numerical simulation, actual basics, and facilities.

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Extra info for New Results in Numerical and Experimental Fluid Mechanics V: Contributions to the 14th STAB/DGLR Symposium Bremen, Germany 2004

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Springer-Verlag, Berlin, 1998. [5] H. Vollmers: "Detection of vortices and quantitative evaluation oftheir main parameters fixmi experimental velocity data". Meas. Sci. Technol. 12,2001, pp. 1-9. Analysis of PIV Flow Field Measurements » 21 : Figure 1 The mapping of a pair of dewarped calibration images from both stereo cameras into one image (left side) demonstrates perfect agreement. The upper vector fields (right side) show the view of both cameras. In the lower part the fields are combined and the vectors are within the plane of the light sheet while the gray values indicate the component normal to the light sheet.

This was unavoidable because spraying sensitive parts like pressure hole and moving parts with black paint was not permitted. Due to this bright background no particles could be distinguished by the cameras in certain areas. The excluded areas reduced information considerably. As both cameras suffer from the reflections, the omitted areas in the combined stereo results are the union of both regions. The thrust with Njsa = 11 050/min was found as a limit for application of PIV because the jet produced condensation in the tuimel for higher thrust.

Further analysis was applied to investigate the location and strength of vortices by methods described in [5]. Examples are given in Figs 3 and 9. The vortex roll-up is continuing and not only one vortex but also strong vorticity layers are generated by the wing and are observed in the velocity fields. The discrepancies between both applied methods for evaluation of vortex parameters become apparent While for the method MOV the distribution of vorticity within the observation area is used, the approximation FAM represents the best fit for the velocity field.

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New Results in Numerical and Experimental Fluid Mechanics V: Contributions to the 14th STAB/DGLR Symposium Bremen, Germany 2004 by Daniel Reckzeh, Heinz Hansen (auth.), Prof. Dr. Hans-Josef Rath, Carsten Holze, Dr. Hans-Joachim Heinemann, Rolf Henke, Professor Dr. Heinz Hönlinger (eds.)


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