Results 191 to 200 of about 402 (235)
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Aerodynamic Characteristics of Fighter Configurations During Spin Entries and Developed Spins
Journal of Aircraft, 1978The NASA Langley Research Center is currently conducting a stall/spin research program to define fighter aerodynamics applicable during spin entries and developed spins and to develop analytical methods to use such measured aerodynamics for theoretically calculating these spin motions.
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Validation of a multipoint approach for modeling spin aerodynamics
Journal of Aircraft, 1995during the spin. The rolling-moment and yawing-moment coefficient variations were relatively small, and thus, the steadyspin assumption is reasonable for these quantities. In contrast is the large amplitude of the pitching moment coefficient trace. The maximum and minimum values of the free-spin results are approximately equal to the rotary balance ...
Paul T. Jaramillo +2 more
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Aerodynamic characteristics of a spinning projectile with elastic deformation
Aerospace Science and Technology, 2016Abstract The elastic deformation of a spinning projectile with a large slenderness ratio influences its flight stability and maneuverability. Unsteady time-accurate simulation based on a dual-time stepping method and the dynamic mesh method were used to solve the unsteady Reynolds-averaged Navier–Stokes (URANS) equations and obtain the aerodynamic ...
Jintao Yin +3 more
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Longitudinal Aerodynamics of a Canard Guided Spin Stabilized Projectile
Advanced Materials Research, 2012Navier–Stokes simulation is performed on a canard guided spinning projectile for different attack angles and circumferential position angles of canard over the Mach number range of 1.8–2.2. The computational Magnus moment coefficients of test case are validated with available experimental data of a Secant-Ogive-Cylinder-Boattail (SOCBT) configuration ...
Xiu Ling Ji +3 more
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Laminar separation bubble in a spinning ball aerodynamics
Physics of FluidsWe explore the flow past a spinning smooth ball at Re=1×105 for the spin factor range 0≤α≤1 using large eddy simulation (LES). When a spinning ball passes through a uniform flow field, an asymmetrical boundary-layer separation occurs along the retreating and advancing sides of the ball.
Navaneeth Krishnan +2 more
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Modified spin filter for noise reduction in aerodynamic imaging
Optics & Laser Technology, 1997A new filtering algorithm was developed for the removal of random noise from digitally imaged aerodynamic flow structures while minimizing geometrical distortion of their shapes. This is a modification of a spin filter previously presented. The algorithm defines a kernel around each pixel and detects the direction of the prevailing pattern passing ...
G. Laufer, B.D. Westring, R.P. Marino
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An evaluation of aerodynamics modeling of spinning light airplanes
21st Aerospace Sciences Meeting, 1983This paper extends the application of the modified strip theory for wing body combination of a spinning light airplane reported earlier. In addition, to account for the contribution of the tail plane, the shielding effect on vertical tail under steady state spin condition is modeled from basic aerodynamic considerations.
B. PAMADI, L. TAYLOR, JR.
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Spinning symmetric missiles in a nonlinear aerodynamic field
1964The case of a spinning symmetric body flying at a constant speed where the aerodynamic restoring moment is an arbitrary function of the angle of attack is examined. The analysis is twofold: first, the general problem is discussed, in suitable nondimensional form, to establish the generalized stability boundaries and, second, the attention is directed ...
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Supersonic aerodynamics of spinning tubular bodies
Journal of Spacecraft and Rockets, 1986E. POLITIS, R. KIND
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