Experimental Investigation of Hover Flowfields in Water at the McDonnell Douglas Research Laboratories,
MCDONNELL DOUGLAS RESEARCH LABS ST LOUIS MO
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The Hover Research Facility, a new experimental facility, is designed to study the flowfields generated by hovering VTOL aircraft and helicopters. Water is used as the working medium because of its inherent advantages in flow visualization and laser Doppler velocimeter LDV measurements. Applications of the HRF include 1 experimental investigation of twin-jet impingement flow with application to VTOL aircraft 2 visualization of the flowfield around a fully contoured, model supersonic fighterattack short-take-off and vertical landing STOVL aircraft and 3 performance testing of a No Tail Rotor NOTAR helicopter in hover mode by use of a scaled model. Flow-visualization and quantitative LDV data on these experiments are presented.