An LDV investigation of support structure influence on the flow field near the wingtip of a STOVL configuration in hover
Enochs, Edgar R.
Hebbar, S. K.
Platzer, Max F.
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Acquisition phase zero (Concept Exploration) of the Advanced Short Takeoff/ Vertical Land (ASTOVL) aircraft development includes, among other tests, evaluation of forces and moments on a large-scale powered model (LSPM) suspended in the Outdoor Aerodynamic Research Facility (OARF) at the NASA Ames Research Center. ThisinvestigationassessedtheinfluenceoftheOARFsupportstructureupontheflowfieldthrough LDV measurements in the vicinity of the struts and the wingtip of a generic flat-plate model mounted in the sub- scaleNPSground-effectstestrig. Themodelwasatwinsubcriticaljetconfigurationwiththenozzlesarranged intandem. ThetestenvironmentwassaturationseededusingasmokegeneratorandLDVmeasurementswere made in the entrained flow. Non-coincident measurements were made to determine the three component mean velocities at points in the region of interest and the component mean and composite mean velocities compared for configurationswithstrutspresentandstrutsremoved. Variationswerediscernibleinthecomponentmean velocities between samples both in the same strut configuration and between the struts-installed and struts- removed configurations, but were generally small enough to be considered negligible.
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