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• W2042823894 abstract "An experiment was conducted to identify and measure the sources of uncertainty that are associated with the application of particle image velocimetry to the measurement of the vortical wakes trailing from helicopter rotor blades. Phase-resolved, three-component particle image velocimetry measurements were performed in the wake of a subscale rotor operating in hover, and were compared with high-resolution three-component laser Doppler velocimetry measurements obtained with the same rotor under identical operating conditions. This helped formulate the essential experimental conditions that need to be satisfied for particle image velocimetry to accurately resolve the high-velocity gradient, high streamline curvature flows that are present inside the rotor wake and in the blade tip vortices. Uncertainties associated with the calibration, acquisition, and processing of the particle image velocimetry images were analyzed in detail. It was shown that the optimization of laser pulse separation time is fundamental to reduce the errors associated with acceleration and curvature effects. Similarly, the interrogation window size was shown to play a critical role in determining the velocity gradient bias errors. The correlation between the laser Doppler velocimetry and particle image velocimetry measurements of the tip vortex characteristics, such as core radius and peak swirl velocity, were found to be excellent." @default.
• W2042823894 created "2016-06-24" @default.
• W2042823894 creator A5006809828 @default.
• W2042823894 creator A5075528331 @default.
• W2042823894 date "2007-11-01" @default.
• W2042823894 modified "2023-09-25" @default.
• W2042823894 title "Benchmarking Particle Image Velocimetry with Laser Doppler Velocimetry for Rotor Wake Measurements" @default.
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• W2042823894 doi "https://doi.org/10.2514/1.28130" @default.
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