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Unsteady forces on oscillating hydrofoils
1966An experimental apparatus is described which has proved to be well suited to the determination of the unsteady lift forces on a hydrofoil oscillating in heave under a free surface. Results are presented for tests covering a wide range of reduced frequency with several foil models in fully wetted, base-ventilated, and supercavitating flow.
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Unsteady forces on counter-rotating propeller blades
4th Applied Aerodynamics Conference, 1986Unsteady forces experienced by counter-rotating propeller blades are examined in this paper. A fully coupled vortex lattice model of counter-rotation is used to obtain a quasi-steady solution to the propeller loadings, and an unsteady Sears (1941) analysis provides an estimate of the unsteady loads from the quasi-steady results.
D. LESIEUTRE, J. SULLIVAN
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Unsteady force measurement technique in shock tubes
Review of Scientific Instruments, 2004An aerodynamic force measurement technique with an extremely short test time was developed. A signal recovery method based on a frequency domain deconvolution technique was applied on a direct acceleration measurement with a weakly restrained test model.
H. Tanno +5 more
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Dynamic stall behavior from unsteady force measurements
Journal of Fluids and Structures, 2008Abstract A direct force measurement technique employing piezoelectric load cells is used to experimentally investigate a two-dimensional airfoil (NACA 0012) undergoing dynamic stall. The load cells are installed at each end of the airfoil and give the force response in two directions in the plane normal to the airfoil axis during oscillations ...
K.K.Y. Tsang +3 more
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Unsteady drag force measurement in shock tube
2005An aerodynamic force measurement technique with an extremely short test time was developed. A signal recovery method based on frequency domain de-convolution technique was applied on a direct acceleration measurement with a weakly-restrained test model.
H. Tanno +6 more
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Assessing Viscous Body Forces for Unsteady Calculations
Journal of Turbomachinery, 2002A strategy has been developed to model the three-dimensional unsteady flows through turbomachines subject to nonaxisymmetric flow/geometrical conditions such as low order distortions with relatively long length-scale unsteadiness, by modeling the viscous effects as local source terms for a coarse computational mesh, but not calculating them directly ...
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Rearward Forcing of an Unsteady Compressible Cascade
Journal of Propulsion and Power, 1999Phase-locked, steady and unsteady, surface pressure measurements were made on the vanes of a compressible cascade, for inlet Mach numbers up to —0.7. The cascade vanes were production hardware stator vanes from an AlliedSignal F109 turbofan engine.
M. K. Fabian, E. J. Jumper
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Aerodynamic Force Modeling for Unsteady Wing Maneuvers
52nd Aerospace Sciences Meeting, 2014Abstract : We report on the development of an aerodynamic force model for a at-plate wing undergoing unsteady motions of surging, pitching, and the combination thereof in two- dimensional ow. This investigation aims to extend the conventional quasi-steady aero- dynamic theory to account for the influence of large-scale vortices generated from the ...
Ryan T. Jantzen +3 more
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Forced internal unsteady aerodynamics
26th Aerospace Sciences Meeting, 1988ERIC STEPHEN +4 more
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Performance of forced unsteady diffusers
19th Aerospace Sciences Meeting, 1981H. VIETS, M. BALL, D. BOUGINE
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