Accession Number:

ADA067902

Title:

Numerical Evaluation of Transonic Equivalence Rule.

Descriptive Note:

Research rept.,

Corporate Author:

FLOW RESEARCH CO KENT WA

Personal Author(s):

• Hafez,M. M.

Report Date:

1978-09-01

Pagination or Media Count:

56.0

Abstract:

A numerical investigation was conducted to explore the applicability of the transonic equivalence rule. It is shown that for wings of small leading edge sweep angle, departure from Whitcomb-Oswatitsch area rule is significant. For sufficiently large or moderate leading edge sweep-angle, however, the agreement is satisfactory. Drag-rise and outer flow field calculations are presented for a number of cases and their equivalent bodies. Nonlinear lift corrections to the classical area rule are examined. There seems to be a surprisingly good agreement between calculated flows around equivalent wing-body combinations with the same wing planform for cases with appreciable lift. Author

Descriptors:

• *TRANSONIC FLOW
• MATHEMATICAL MODELS
• ANGLE OF ATTACK
• FLOW FIELDS
• APPROXIMATION(MATHEMATICS)
• BOUNDARY VALUE PROBLEMS
• AERODYNAMIC DRAG
• LIFT
• WING BODY CONFIGURATIONS
• ASPECT RATIO
• SWEPTBACK WINGS
• THREE DIMENSIONAL FLOW
• TRANSONIC CHARACTERISTICS
• AXISYMMETRIC FLOW
• THEOREMS
• BODIES OF REVOLUTION
• THIN WINGS
• CARTESIAN COORDINATES

Subject Categories:

• Aircraft
• Numerical Mathematics
• Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE