Results 181 to 190 of about 45,328 (229)

Fluid mechanics of dynamic stall part I. Unsteady flow concepts

Journal of Fluids and Structures, 1988
Advanced military aircraft 'supermaneuverability' requirements entail the sustained operation of airfoils at stalled flow conditions. The present work addresses the effects of separated flow on vehicle dynamics; an analytic method is presented which employs static experimental data to predict the separated flow effect on incompressible unsteady ...
L.E. Ericsson, J.P. Reding
openaire   +2 more sources

Fluid mechanics of dynamic stall part II. Prediction of full scale characteristics

Journal of Fluids and Structures, 1988
Analytical extrapolations are made from experimental subscale dynamics to predict full scale characteristics of dynamic stall. The method proceeds by establishing analytic relationships between dynamic and static aerodynamic characteristics induced by viscous flow effects.
L.E. Ericsson, J.P. Reding
openaire   +2 more sources

Fluid-Mechanics Mechanisms in the Stall Process of Airfoils for Helicopters

, 1982
The stalling of helicopter rotor blades occurs on the retreating side of the rotor disk. The lower velocity on the retreating side (typically 0.3 to 0.5 Mach number) is compensated for by higher lift coefficients, which require higher angles of attack.
W. H. Young
openaire   +2 more sources

Application of PIV in fundamental fluid mechanics: boundary layers, delta wing cross flow and dynamic stall

, 1998
Kompenhans, J., Raffel, M., Dieterle, L., Dewhirst, T., Vollmers, H.   +4 more
openaire   +2 more sources

Some of the next articles are maybe not open access.

Related searches:

Post-stall flow control on aerofoils by leading-edge flags

Journal of Fluid Mechanics, 2023
Self-excited oscillations of flags attached at the leading edge of aerofoils have been investigated at post-stall angles of attack at a chord Reynolds number of 100 000.
Junchen Tan, Zhijin Wang, I. Gursul
semanticscholar   +1 more source

Aerodynamics and fluid–structure interaction of an airfoil with actively controlled flexible leeward surface

Journal of Fluid Mechanics, 2023
Piezoelectric macro-fibre composite (MFC) actuators are employed onto the flexible leeward surface of an airfoil for active control. Time-resolved aerodynamic forces, membrane deformations and flow fields are synchronously measured at low Reynolds number
Xi He, Qinfeng Guo, Yang Xu, Lihao Feng, Jinjun Wang   +4 more
semanticscholar   +1 more source

Dynamic stall at high Reynolds numbers induced by ramp-type pitching motions

Journal of Fluid Mechanics, 2022
The transient pressure field around a moderately thick airfoil is studied as it undergoes ramp-type pitching motions at high Reynolds numbers and low Mach numbers.
J. Kiefer, C. Brunner, M. O. Hansen, M. Hultmark   +3 more
semanticscholar   +1 more source

Critical indicators of dynamic stall vortex

Journal of Fluid Mechanics, 2022
During a dynamic stall process, various flow structures leave their pressure footprints on a wing surface, through which it is possible to understand the development of different flow stages and predict the critical flow events.
Xiao Li, Lihao Feng
semanticscholar   +1 more source

Numerical and Experimental Fluid–Structure Interaction-Study to Determine Mechanical Stresses Induced by Rotating Stall in Unshrouded Centrifugal Compressor Impellers

Journal of Turbomachinery, 2018
Unshrouded industrial centrifugal compressor impellers operate at high rotational speeds and volume flow rates. Under such conditions, the main impeller blade excitation is dominated by high frequency interaction with stationary parts, i.e., vaned diffusers or inlet guide vanes (IGVs).
B. Mischo, P. Jenny, S. Mauri, Y. Bidaut, M. Kramer, S. Spengler   +5 more
openaire   +1 more source

The effects of leading-edge tubercles on dynamic stall

Journal of Fluid Mechanics, 2020
The effects of leading-edge tubercles, based on the flippers of humpback whales, on the flow field around an airfoil undergoing large-amplitude dynamic changes in the angle of attack have been studied experimentally. Airfoils were pitched from an initial
John T. Hrynuk, D. Bohl
semanticscholar   +1 more source