Post-stall wind tunnel data for NACA 44XX series airfoil sections

Technical Report · Tue Jan 01 04:00:00 EST 1985

DOI:https://doi.org/10.2172/5791328· OSTI ID:5791328

Ostowari, C; Naik, D

Wind turbine blades operate over a wide angle of attach range. Unlike aircraft, a wind turbine's angle of attach range extends deep into stall where the three-dimensional performance characteristics of airfoils are not generally known. Peak power predictions upon which wind turbine components are sized depend on a good understanding of a blade's post-stall characteristics. The purpose of this wind tunnel study is to characterize the performance characteristics of a blade in stall as a function of its aspect ratio, airfoil thickness, and Reynolds number. This report documents results of the wind tunnel investigation of constant chord blades having four aspect ratios, with NACA 44XX series airfoil sections, at angles of attack ranging from -10/sup 0/ to 110/sup 0/. Tests were conducted at Reynolds number ranging from 0.25 x 106 to 1.0 x 106. The thickness ratios studied were 0.18, 0.15, and 0.12, and 0.09. The aspect ratios were 6, 9, 12 and infinity. Results of force and pitching moment measurements over the angle of attack range for all combinations of Reynolds numbers, thickness, and aspect ratios, and the effects of boundary layer tripping are presented.

• Research Organization: Texas A and M Univ., College Station (USA). Dept. of Aerospace Engineering
• DOE Contract Number: AC02-83CH10093
• OSTI ID: 5791328
• Report Number(s): SERI/STR-217-2559; ON: DE85002948
• Country of Publication: United States
• Language: English

Related Subjects

17 WIND ENERGY
170602* -- Wind Energy Engineering-- Turbine Design & Operation
AERODYNAMICS
AIRFOILS
ASPECT RATIO
BOUNDARY LAYERS
DATA
FLUID MECHANICS
LAYERS
MECHANICS
PERFORMANCE
PERFORMANCE TESTING
REYNOLDS NUMBER
TESTING
TUNNELS
TURBINE BLADES
UNDERGROUND FACILITIES
WIND POWER
WIND TUNNELS
WIND TURBINES