NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Collections About News Help Login
Back to Results
Predictions of F-111 TACT aircraft buffet response and correlations of fluctuating pressures measured on aluminum and steel models and the aircraftResults of buffet research that was conducted as part of the joint USAF/NASA F-111 TACT Research Program are presented. The correlation of wind tunnel and flight measurements of buffet excitation showed that there generally was good agreement between measurements of pressure fluctuations on the models and aircraft in regions of separated flow. At shock-wave boundaries of the separated flow, correlations of pressure fluctuations were not so good, due to Reynolds number and static elastic effects. The buffet prediction method, which applies a forcing function that is obtained by real-time integration of pressure time histories with the natural modes, is described. The generalized forces, including the effects of wing and tail, correlations of predicted and measured damping, and correlations of predicted and measured buffet response are presented. All presented data are for a Mach number of 0.8 with wing-sweep angles of 26 and 35 deg for a range of angles-of-attack that include buffet onset to high intensity buffeting. Generally, the buffet predictions were considered to be quite good particularly in light of past buffet-prediction experience.
Document ID
19880003836
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Coe, Charles F. (Coe Engineering, Inc. Los Altos, CA., United States)
Cunningham, Atlee M., Jr. (General Dynamics Corp. Fort Worth, Tex., United States)
Date Acquired
September 5, 2013
Publication Date
January 1, 1987
Subject Category
Aerodynamics
Report/Patent Number
NAS 1.26:4069
NASA-CR-4069
Accession Number
88N13218
Funding Number(s)
CONTRACT_GRANT: NAS2-11420
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

Related Records

There are no records associated with this record.
No Preview Available