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research & development


proves a valuable tool for fl ow measurements


Stereo Particle Image Velocimetry (PIV) is an advanced measuring


technique for obtaining 3D velocity information in a plane. PIV can be used to investigate the spatial structure of a flow by efficiently measuring in multiple planes. It is an important tool for the experimental validation of


CFD calculations and for obtaining flow field information. This information can then be used for appendage or propeller design for instance.


T Michiel Verhulst, Serge


Toxopeus & Rink Hallmann m.verhulst@marin.nl


18 report


Successful system tests Over the last five years MARIN cooperated with Sirehna


urement of the displacement ∆x of particles in a target plane between two successive light pulses with a time delay. The flow is seeded with particles and the target plane is illuminated with a light sheet. Particle positions are recorded by two special digital cameras. One PIV image con- sists of two image frames belonging to the two successive light pulses. Special image processing software analyses the movements of the group of particles in subsections of the PIV image using correlation techniques. The output is an instantaneous velocity field in the measuring plane. The third velocity component, perpendicular to the measuring plane, can be derived by using two cameras in a stereoscopic arrangement. Therefore, this method is called stereoscop- ic-PIV or stereo-PIV.


his technique is based on the meas-


in the field of PIV, using a shared system. To make PIV more interesting for customers, MARIN invested in a new system and last September, successful acceptance tests were performed. Designed by DANTEC, the new MARIN stereo-PIV system draws on experiences with the previous system and it is based on the very latest developments. A powerful 200 mJ laser and high-resolution four-Megapixel cameras are mounted on one rigid probe. The new system is optimised for efficient use in a production environment and is permanently installed at the towing carriage. Special effort has been put into reducing the time required for set-up and for calibration, therefore making the PIV system very cost-effective. The new system has already been successfully used for several projects in recent months.


PIV capabilities To demonstrate the strengths of PIV, as well as the CFD capabil- ities, one of the projects performed with the


New stereo-PIV system


Report gives an overview of stereoscopic-PIV and MARIN’s new system.


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