Results 261 to 270 of about 1,824,087 (309)

The Unsteady Forces Due To Propeller-Appendage Interaction

Journal of Applied Mechanics, 1963
This paper presents a study of the nature of the unsteady forces in the field of a propeller rotating in the vicinity of an appendage. The propeller is assumed to be one of a high aspect ratio while the appendage, although of finite width, is assumed to be infinitely long, and thus the problem is reduced to a study of the unsteady flow field around two
Pinkus, O., Lurye, J. R., Karp, S.
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Unsteady forces on spherical bubbles

Experiments in Fluids, 1995
An experimental investigation of freely rising spherical bubbles through a quiescent liquid is presented. The objective of the experiments is to examine the validity of a recently proposed history force expression for clean, spherical bubbles at finite Reynolds number (Mei et al. 1994).
W. C. Park, J. F. Klausner, R. Mei
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The Unsteady Forces Due to Viscous Wakes in Turbomachines

Journal of the Aeronautical Sciences, 1955
The configuration of viscous wakes of cascade blades is approximated from single airfoil experiments. The unsteady force and moment on a downstream blade passing through such wakes is then calculated on the basis of the theory of isolated thin airfoils in nonuniform motion.
Kemp, Nelson H., Sears, W. R.
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History forces and the unsteady wake of a cylinder

Journal of Fluid Mechanics, 1999
History forces on a stationary cylinder in arbitrary unsteady rectilinear flow are calculated by means of a model based on the asymptotic properties of the steady-state wake. The results capture many features found in numerical solutions of the Navier–Stokes equation for the same flows, though quantitative agreement deteriorates as the Reynolds ...
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A Review Analysis of Unsteady Forces in Hydraulic Valves

International Journal of Fluid Power, 2006
AbstractIn the fluid power applications where the typical operating conditions are dynamic the knowledge of the unsteady flow forces that act on the spools of the hydraulic valves represents an important issue to be addressed in order to make a correct design of the valve geometry and its driving system.This paper deals with a rigorous unsteady ...
Del Vescovo, G., Lippolis, A.
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The Mean Power of Forces and Moments in Unsteady Aerodynamics

ZAMM - Journal of Applied Mathematics and Mechanics / Zeitschrift für Angewandte Mathematik und Mechanik, 1992
AbstractThe balance of mechanical energy serves as the starting point for a unified and consistent approach to the two basic and inherent mechanisms in unsteady aerodynamics, propulsion and flutter. Both phenomena are mutually dependent and interchangeable with each other by a mere variation of the reduced frequency as the governing magnitude with ...
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Control of Unsteady Aerodynamic Forces

1990
Abstract : The aerodynamic properties of an airfoil under unsteady conditions are very different from ones in steady conditions because the vortex generated by unsteady separation greatly modifies the loading on the wing. In this study, a fundamental approach was taken to investigate the lift and the velocity field of unsteady airfoils.
Mario Lee, Hank Lin, Chiang Shih, Ismet Gursul, Chih-Ming Ho   +4 more
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On the convergence of unsteady generalized aerodynamic forces

Dynamics Specialists Conference, 1981
Generalized aerodynamic forces computed from analyses based on distributed pressures and finite paneling procedures are examined for solution convergence The necessity for examining the convergence of calculated forces as a function of the number of assumed pressure terms or the number of panels is well demonstrated The lifting series method converges ...
William S. Rowe, Herbert J. Cunningham
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Rearward Forcing of an Unsteady Compressible Cascade

Journal of Propulsion and Power, 1999
Phase-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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Unsteady free and forced convective diffusion

International Journal of Engineering Science, 1984
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Mazumder, B. S., Dandapat, B. S.
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