Accession Number:

AD0772892

Title:

Half- and Full-Model Experiments on Slender Cones at Angle of Attack,

Descriptive Note:

Corporate Author:

NATIONAL AERONAUTICAL ESTABLISHMENT OTTAWA (ONTARIO)

Report Date:

1973-05-09

Pagination or Media Count:

8.0

Abstract:

An evaluation has been made of the angle-of-attack range at which experiments on slender sharp cones can be performed using half models. The evaluation was based partly on a comparison of surface flow patterns over full and half models, partly on the measurement of the static side force on full models at zero yaw, and partly on a comparison of oscillatory pitching results obtained with full and half models. Most of the results were obtained at a Mach number of two in the range of angle of attack between 0 deg and 30 deg, but the static side force was also measured at Mach numbers between 0.5 and 0.8. In all cases investigated it was found that up to an angle of attack of at least 15 deg no significant side force could be detected on full models, and that the pitch damping results and the surface flow patterns with the exception of the primary attachment line obtained on full and half models were in close agreement. The half-model technique appears therefore suitable for oscillatory experiments on slender cones and probably on other similar geometries at angles of attack at least up to 15 deg, at low supersonic speeds. Application to higher speeds, however, may very well require special corrections for tunnel-wall or reflection-plate boundary layer. Author

Subject Categories:

  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE