Abstract

A computational and experimental effort to investigate the e ow around rotor blades in hover is presented. The experimental analysis of the e owe eld in the immediate vicinity of the blade is supported by laser velocimetry (LV) performed on the three-dimensional velocity e eld around the bladesection and in its nearwake. A specie c LV data processingmethod based onthemomentumequationapplied around a bladesectionhasbeen developed to identify the contribution of the induced-drag component to the total sectional drag coefe cient. From the computational approach, some improvements to a vortex embedding full-potential method are checked by direct comparisons withtestdata. Comparisonsareperformed foroverallrotorairloads (thrustand torquecoefe cients ),localsectional coefe cients (liftanddragcontributions ),ande owe eldcharacteristics,includingthetipvortexpathandthespanwise circulation distribution.

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