The measurement of three dimensional local flow vectors of a blade tip vortex at positions near the helicopter rotor plane were performed with a three component Laser-Doppler- Velocimeter (3D LDV). A' position monitoring system' synchronized to the blade rotation gave access to blade motion parameters like lead-lag and pitching at the desired radial position of the blade. Mainly results concerning the structure of blade tip vortices were obtained. The measurements of a vortex generated at hover condition showed the correctness of 'time history' data acquisition, e.g. taking data during the time interval when one particular blade is passing the location of the measuring volume of the LDV. Vortex structure measurements at two different blade tips, a regular square tip for reference and a non-planar tip called winglet, were carried out. First of all the influence of the winglets on vortex structure and blade vortex interaction (BVI) has been investigated. Then in addition to the vortex parameters like vortex/blade miss distance, vortex core size, axial velocity deficit, vortex strength, and vorticity distribution with respect to the spatial orientation of the vortex axis, results on 3D-vortcity distribution and the temporal vortex roll up for the different blade tip vortices have been obtained.
Flow field investigation of a rotating helicopter rotor blade by three-component Laser-Doppler-Velocimetry
Eine Strömungsfeld-Untersuchung an einem rotierenden Rotorblatt eines Hubschraubers durch eine Drei-Komponenten Laser-Doppler Geschwindigkeitsmessung
1995
12 Seiten, 21 Bilder, 12 Quellen
Aufsatz (Konferenz)
Englisch
Flow Field Investigation of a Rotating Helicopter Blade by Three-Component Laser-Doppler-Velocimetry
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