Prediction of Normal Force, Pitching Moment, and Yawing Force on Bodies of Revolution at Angles of Attack Up to 50 Degrees Using a Concentrated Vortex Flow-field Model
Title | Prediction of Normal Force, Pitching Moment, and Yawing Force on Bodies of Revolution at Angles of Attack Up to 50 Degrees Using a Concentrated Vortex Flow-field Model PDF eBook |
Author | Andrew B. Wardlaw (Jr.) |
Publisher | |
Pages | 100 |
Release | 1973 |
Genre | Angle of attack (Aerodynamics) |
ISBN |
A method initially proposed by Bryson is extended to include asymmetric shedding. This method employs the impulsive flow analogy, and models each wake vortex using a single-point vortex. Free parameters inherent in the problem formulation are determined empirically. Normal force, pitching moment and yawing force coefficients are predicted for slender bodies with a nose fineness ratio greater than four and at a Mach number less than 0.9. (Modified author abstract).
Prediction of Normal Force, Pitching Moment, and Yawing Force on Bodies of Revolution at Angles of Attack Up to 50 Degrees Using a Concentrated Vortex Flow-Field Model
Title | Prediction of Normal Force, Pitching Moment, and Yawing Force on Bodies of Revolution at Angles of Attack Up to 50 Degrees Using a Concentrated Vortex Flow-Field Model PDF eBook |
Author | |
Publisher | |
Pages | 94 |
Release | 1973 |
Genre | |
ISBN |
A method initially proposed by Bryson is extended to include asymmetric shedding. This method employs the impulsive flow analogy, and models each wake vortex using a single-point vortex. Free parameters inherent in the problem formulation are determined empirically. Normal force, pitching moment and yawing force coefficients are predicted for slender bodies with a nose fineness ratio greater than four and at a Mach number less than 0.9. (Modified author abstract).
Induced Side Forces on Bodies of Revolution at High Angle of Attack
Title | Induced Side Forces on Bodies of Revolution at High Angle of Attack PDF eBook |
Author | Wardlaw, Jr. (Andrew B.) |
Publisher | |
Pages | 52 |
Release | 1975 |
Genre | Aerodynamic load |
ISBN |
Linear regression techniques are used to establish a quantitative description of side forces on bodies at high incidence. A data base is assembled concerning the key side force characteristics of maximum observed side force, angle of occurrence, and minimum angle of attack at which a side force is observed. This information is examined to determine the important trends and a predictive model for side force based on the crossflow analogy is developed to suggest other important variables. A linear regression model for these quantities is developed to include only those variables which are statistically significant. Results indicate that peak side force coefficients are a function of Mach number and only weakly of Reynolds number. Nose fineness is the critical model dimension which suggests that peak side force is a product of the nose flow field. The angle at which peak side forces occur is found to be dependent on model length and Mach number, while the onset angle of attack is a function of model length only.
Naval Research Reviews
Title | Naval Research Reviews PDF eBook |
Author | |
Publisher | |
Pages | 520 |
Release | 1976 |
Genre | Naval research |
ISBN |
Scientific and Technical Aerospace Reports
Title | Scientific and Technical Aerospace Reports PDF eBook |
Author | |
Publisher | |
Pages | 202 |
Release | 1974 |
Genre | Aeronautics |
ISBN |
A Selective Bibliography on High-angle-of-attack Aerodynamics of Aircraft and Aircraft Components at Subsonic Speeds
Title | A Selective Bibliography on High-angle-of-attack Aerodynamics of Aircraft and Aircraft Components at Subsonic Speeds PDF eBook |
Author | Henry W. Woolard |
Publisher | |
Pages | 40 |
Release | 1974 |
Genre | Aerodynamic measurements |
ISBN |
Boundary Layer Effects
Title | Boundary Layer Effects PDF eBook |
Author | Anthony W. Fiore |
Publisher | |
Pages | 962 |
Release | 1978 |
Genre | Turbulent boundary layer |
ISBN |
In 1975 the U.S. Air Force and the Federal Republic of Germany signed a Data Exchange Agreement numbered AF-75-G-7440 entitled 'Viscous and Interacting Flow Fields.' The purpose was to exchange data in the area of boundary layer research. It includes both experimental and theoretical boundary layer research at speeds from subsonic to hypersonic Mach numbers in the presence of laminar, transitional, and turbulent boundary layers. The main effort in recent years has been on turbulent boundary layers, both attached and separated in the presence of such parameters as pressure gradients, wall temperature, surface roughness, etc. In the United States the research was conducted in various Department of Defense, NASA, aircraft corporations, and various university laboratories. In the Federal Republic of Germany it was carried out within the various DFVLR, industrial, and university research centers.