Recent applications of high-speed PIV measurements

Kurzfassung

Particle Image Velocimetry is a non-intrusive technique to measure the flow velocity in an extended region instantaneously. With the introduction of high speed cameras and high repetition-rate lasers the framing rate can be increased by several orders of magnitude compared to conventional PIV systems. For turbulent flows with moderate Reynolds numbers, the measurement frequency of such a PIV system can be as high as the Kolmogorov frequency in the investigated flow field. The influence of the interrogation window size on the measured frequency spectrum and therewith the statistical quantities are demonstrated for two simple flow cases. Furthermore an overview of recent applications of the so called High-Speed-PIV system to different flow configurations is given. It includes data achieved from an application of time-resolved tomographic PIV to a turbulent spot, the calibration of a velocity sensor of an acoustic p-u probe and the unsteady effects of a plasma actuator.