Download e-book for iPad: Particle Image Velocimetry: Progress towards Industrial by M. Stanislas LML, J. Kompenhans DLR (auth.), M. Stanislas,

By M. Stanislas LML, J. Kompenhans DLR (auth.), M. Stanislas, J. Kompenhans, J. Westerweel (eds.)

ISBN-10: 9048153948

ISBN-13: 9789048153947

ISBN-10: 9401725438

ISBN-13: 9789401725439

The aeronautics is almost immediately aiming for speedier layout cycles and shorter time to industry of latest airplane. it really is an analogous time for superior aerodynamic functionality, for glaring aggressive purposes. complicated, machine established layout platforms, together with quickly and trustworthy numerical movement solvers, were built within the final decade together with new turbulence versions. at the experimental facet, size innovations normally have additionally been stronger considerably, but the information review approach is still nonetheless very time eating, and unsteady results and turbulence are usually now not being captured with enough accuracy and aspect. the improvement of Particle photograph Velocimetry (PIV) has helped to enhance the research of the stream fields. After investigations in laboratory scale wind tunnels, a joint initiative on PIV examine, by way of the ecu Aerospace study institutions, inside GARTEUR have enabled a large step forward of this new expertise in Europe. in the learn Framework software of the ecu Union, the joint examine undertaking EUROPIV aimed to use PIV expertise to difficulties of business interest.

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The focal length of the Zeiss lens is 100 mm. The recording medium used was Kodak TMAX 3200 B/W film which has a resolution of 100 line pairs per mm. To resolve the ambiguity on the velocity sign and to increase the dynamic range, a rotating mirror system is used [12]. 10). These experiments were the first performed with the nozzle. At that time, the light source used by DLR was a pulsed Nd :YAG laser at 532 nm with 50 mJ per pulse and a pulse length of 16 nsec. The recording system was also a modified 35mm photo camera with internal CCD replacing the viewer.

Considering the spatial structures in the velocity vector maps, all evaluation systems show similar results. Smaller deviations can be explained by the different size of dw interrogation windows or different peak detection algorithms. The evaluation of the scanned version of image 4 yields a higher number of vectors due to the smaller size of the interrogation window possible for the digital evaluation. T,able 34 Team stattst1ca . 4. gives the result of the analysis by the different teams, including the sum of mean flow velocity and the additional velocity Ushift introduced by the rotating mirror.

E. ). To compare different evaluations, not only the data but also important parameters from experiment and evaluation have to be passed. As a lot of files were expected to go into the database, the same file should store data as well as additional parameters to make things more compact. It must be able to store more than one data field per file and different data types (for example to mark bad vectors). Technical progress of PIV systems will make it necessary to be able to include extensions into the file format in future.

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Particle Image Velocimetry: Progress towards Industrial Application by M. Stanislas LML, J. Kompenhans DLR (auth.), M. Stanislas, J. Kompenhans, J. Westerweel (eds.)


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