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Measurements of cylinder’s wake by Tomo-PIV
Pages: 60-64
Year: Issue:  5
Journal: Experiments and Measurements in Fluid Mechanics

Keyword:  optical measurementTomo-PIVwake of cylinderflow field measurementwind tunnel;
Abstract: Tomographic particle image velocimetry(Tomo-PIV)is an advanced optical measurement technology,which can acquire three-dimensional three-components(3D3C)flow field structure quantitatively in a complete volume,and can be used as an effective method on turbulence,vortex interference and other complex three-dimensional flow field measurement.In order to achieve the measurement application of Tomo-PIV in the FL-5wind tunnel with 1.5mdiameter test section of AVIC Aerodynamics Research Institute,the wake of a cylinder with 12 mm diameter is investigated by means of Tomo-PIV.The flow speed is 15m/s,the measurement volume is illuminated by a 2×200mJ laser,and four 2048×2048pixels CCD cameras with 85 mm lens are used to record particles images from different directions.By solving a series of engineering problems,such as diffusion of particles and optical path design,we successfully obtained the Karman rollers flow structure of the cylinder’s wake.Then,we studied the method of the data processing.The measurement volume extends approximately over a region of 95mm×70mm×8.5mm with the shortest side in the direction of the depth of field,and the particle image spatial resolution is about 20pixels/mm.There are tens of thousands of vectors recorded at every snapshot.We can obtain a lot of information about the flow field by Tomo-PIV,much more than that obtained by 2DPIV or stereo-PIV measurement.
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