Accession Number : ADA302427

Title :   Extension of the NSWCDD Aeroprediction Code to the Roll Position of 45 Degrees.

Descriptive Note : Final rept.,

Corporate Author : NAVAL SURFACE WARFARE CENTER DAHLGREN DIV VA

Personal Author(s) : Moore, Frank ; McInville, Roy

PDF Url : ADA302427

Report Date : DEC 1995

Pagination or Media Count : 155

Abstract : The NSWCDD Aeroprediction Code has been extended to the roll position of 45 degrees (or fins in cross or "x" orientation). New technology developed includes wing body and body wing interference factors for this roll orientation and to angles of attack of 90 degrees; new semi-empirical wing tail interference models for both the fins in 0 and 45 degrees roll positions; and approximate methods to estimate wing alone center of pressure shift at high angles of attack and 45 degrees roll position as well as "fin choking" at high mach number. This new technology allows aerodynamics to be estimated with average accuracy levels of +/- 10 percent on normal and axial force coefficients and +/- 4 percent of body length on center of pressure. An exception to this is at subsonic mach number and high angle of attack where wind tunnel sting interference effects are present and at high Mach number and angle of attack where internal shock interactions from a forward fm onto an aft mounted fin are present. Results are presented for several wing body and wing body tail configurations at various Mach numbers and angles of attack to support this average accuracy level conclusion.

Descriptors :   *ROLL, *AERODYNAMIC FORCES, *INTERFERENCE, *WING BODY CONFIGURATIONS, SLENDER BODIES, INTERACTIONS, TAIL ASSEMBLIES, ACCURACY, VORTICES, ANGLE OF ATTACK, APPROXIMATION(MATHEMATICS), COEFFICIENTS, SHOCK, SHIFTING, PRESSURE, AXES, WIND TUNNEL TESTS, MOUNTS, MACH NUMBER, WINGS, FINS, HIGH ANGLES.

Subject Categories : Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE