Accession Number:

ADA056045

Title:

The Influence of Aerodynamic Interference on High Angle of Attack Wind Tunnel Testing.

Descriptive Note:

Final rept. 1 Apr 77-31 Mar 78,

Corporate Author:

NOTRE DAME UNIV IND DEPT OF AEROSPACE AND MECHANICAL ENGINEERING

Personal Author(s):

• Nelson,Robert C.
• Mouch,Thomas N.

Report Date:

1978-06-01

Pagination or Media Count:

39.0

Abstract:

Results from an experimental investigation of strut support interference on high angle of attack aerodynamic measurements are presented. The influence of the strut support on the leeward wake structure was investigated by means of a two-dimensional experiment of a cylinder-splitter plate combination. Pressure distributions, pressure drag coefficient and wake flow visualization data for various cylinder-splitter plate combinations are presented for high subcritical Reynolds numbers. The influence of plate position and size on the pressure drag coefficient were also examined. The results show the splitter plate can alter the vortex wake formation significantly and, as a consequence, reduce the pressure drag coefficient by as much as 30 or more. Plate sizes of 0.5, 1.1 and 1.5 diameter were tested with the 1.1 diameter plate yielding the largest drag reduction. Author

Descriptors:

• *AERODYNAMIC FORCES
• *INTERFERENCE
• *STRUTS
• ANGLE OF ATTACK
• FLOW VISUALIZATION
• VORTEX SHEDDING
• PRESSURE MEASUREMENT
• PLATES
• WIND TUNNEL TESTS
• WAKE
• AERODYNAMIC DRAG
• REYNOLDS NUMBER

Subject Categories:

• Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE