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.)

The aeronautics is almost immediately aiming for quicker layout cycles and shorter time to industry of latest plane. it's an analogous time for greater aerodynamic functionality, for obtrusive aggressive purposes. complex, desktop dependent layout platforms, together with quick and trustworthy numerical move solvers, were constructed within the final decade together with new turbulence versions. at the experimental part, size strategies in most cases have additionally been more desirable considerably, but the information assessment method is still nonetheless very time eating, and unsteady results and turbulence are frequently now not being captured with enough accuracy and aspect. the advance of Particle snapshot Velocimetry (PIV) has helped to enhance the research of the circulation fields. After investigations in laboratory scale wind tunnels, a joint initiative on PIV examine, via the eu Aerospace examine institutions, inside GARTEUR have enabled a large leap forward of this new know-how in Europe. in the examine Framework software of the eu Union, the joint study undertaking EUROPIV aimed to use PIV expertise to difficulties of business interest.

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Although the PIV system used is quite different in both cases, the agreement is quite good on the mean velocity and on the longitudinal turbulence intensity. The accuracy of PIV is not so good on both mean and fluctuating transverse components which, being much smaller than the longitudinal ones, are subject to window smearing and background noise. In fact, the cross correlation method gives a noise level comparable to LDV, which is not the case of the rotating mirror device. This is mainly due to the fact that the compromise between dynamic range and loss of signal due to out of plane motion was not optimal in the case of Monnier et al.

_L//1 ' ....... ' . , - r-"". ::::=::::::::==:::::~:::~:~::~:: :- :. ~::. :=~: _______________ ........ -- - · . ::. :~~~~~: , . -" ~ -----------------~ ... _, _ _ _ _ _ _ __ ' ..... J........ _ _ __ l __ _ ____l_ _ _ _ , Figure 2. 16. 15. Analysis by optical/digital auto correlation. Due to the inhomogeneous seeding and to the lack of shifting device, only the core of the jet gives meaningful results. 17. 5 m, seeding: olive oil droplets. First exposure of a double frame record with a lK x lK video camera (negative image) 10 rr/s _ im33dl rb .

Image 4 is of particular interest as it was analyzed by 5 teams. Both, optical and digital evaluation methods were employed. In order to better visualize the spatial structures in the flow field the flow velocity Uavg• as obtained from averaging over the ucomponent of all velocity vectors of the map was subtracted from each individual vector. 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.

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