Abstract
AGARD-B is a widely-used configuration of a standard wind tunnel model. Beside its originally intended application for correlation of data from supersonic wind tunnel facilities, it was tested in a wide range of Mach numbers and, more recently, used for assessment of wall interference effects, validation of computational fluid dynamics codes and validation of new model production technologies. The researchers and wind tunnel test engineers would, naturally, like to know the "true" aerodynamic characteristics of this model, for comparison with their own work. Obviously, such data do not exist, but an estimate can be made of the dispersion of test results from various sources and of the probable "mean" values of the aerodynamic coefficients. To this end, comparable transonic test results for the AGARD-B model at Mach numbers 0.77, Mach 1.0 and Mach 1.17 from six wind tunnels were analyzed and average values and dispersions of the aerodynamic coefficients were computed.
Highlights
Standard wind tunnel models are important tools of experimental aerodynamics
An additional intention of the authors was to present a set of comparative results for the AGARD-B configuration in the transonic speed range that might be of help to other researchers, because, sets of test results from various sources are available, the data are not always in legible form
Results from these five wind tunnels are compared to a set [15] of results from the Arnold Engineering Develop-ment Complex (AEDC) (Arnold Engineering Development Center) 4T 4 ft wind tunnel [24] in the USA, which differs from data sets [2][4][11][20] in that the model frontal blockage was very small (0.15%) so it can be considered that the test was practically wallinterference-free
Summary
Standard wind tunnel models (reference models, calibration models or test check-standards) are important tools of experimental aerodynamics They are objects of simple, precisely defined shapes (usually resembling a simplified form of an airplane or a rocket) that are tested in wind tunnels in order to verify the complete measurement chain, including wind tunnel structure, quality of the airstream, model positioning, transducers and force balances, data acquisition system and data reduction software. The researchers and wind tunnel test engineers would, naturally, like to have access to “true” aerodynamic characteristics of the selected standard model configuration, with which to compare their own work Such data do not exist because each set of test results is influenced by the differences in model production, differences in test conditions and the peculiarities of particular wind tunnel facilities and measurement systems used. An additional intention of the authors was to present a set of comparative results for the AGARD-B configuration in the transonic speed range that might be of help to other researchers, because, sets of test results from various sources are available, the data are not always in legible form
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