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W. Splettstoesser, K. Schultz, D. Boxwell, F. Schmitz (1984)
Helicopter Model Rotor-Blade Vortex Interaction Impulsive Noise: Scalability and Parametric Variations
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An Experimental Investigation of Vortex Rings and Helicopter Rotor Wakes Using a Laser Doppler Velocimeter
Density fields of the blade tip vortices from a helicopter in hover flight were visualized by a technique which does not require any installation on the helicopter or close to it. The results illustrate an encouraging prospect for the applicability of the technique. It offers the capability of at least qualitative investigations of unsteady density fields even in full-scale flight tests. The underlying principle is briefly described in this article and an extension to a three-dimensional quantitative technique by using multiple cameras is outlined.
Experiments in Fluids – Springer Journals
Published: May 3, 2000
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