F-18 high alpha research vehicle surface pressures - Initial in-flight results and correlation with flow visualization and wind-tunnel dataFlight tests with the NASA F-18 high-alpha research vehicle (HARV) have yielded pressure distributions at angles of attack from 10 to 50 deg, at Mach 0.23 to 0.6, at five fuselage forebody stations and three on the leading-edge extensions (LEXs). Correlations are made between these data and both previously obtained HARV flow visualizations and wind tunnel model test results. The general trend is one in which the forebody's maximum suction pressure peaks increase in magnitude, after their first appearance at alpha of about 19 deg, with increasing alpha. LEX pressure-distribution trends involve the inward progression of the maximum suction peaks, an increase in the magnitude of the maximum pressure peaks up to pressure core breakdown, and the decrease and general flattening of the pressure distribution beyond the LEX primary vortex breakdown.
Document ID
19900058830
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Fisher, David F. (NASA Flight Research Center Edwards, CA, United States)
Banks, Daniel W. (NASA Langley Research Center Hampton, VA, United States)
Richwine, David M. (PRC Systems Services Co. Edwards, CA, United States)