Results 221 to 230 of about 72,003 (271)

Recent Advances in the Analysis of Functional and Structural Polymer Composites for Wind Turbines. [PDF]

Polymers (Basel)
Lagos F, Menacer B, Salas A, Narayan S, Medina C, Valle R, Garrido C, Pincheira G, Oñate A, Hunter-Alarcón R, Tuninetti V.   +10 more
europepmc   +1 more source

Light driven polymer thin films as flying robotic chips in the sky.

Lab Chip
Yang J, Zeng H.
europepmc   +1 more source

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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

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   +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

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   +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

Diffuser Vane Slit Width Optimization Using Simple Prediction Method of Diffuser Rotating Stall Onset in a Centrifugal Pump

Volume 1: Fluid Applications and Systems (FASTC); Fluid Measurement and Instrumentation (FMITC); Fluid Mechanics (FMTC), 2022
The objective of this study is suppressing the diffuser rotating stall (DRS) for wide range from larger flow rate to shut off without reducing the maximum efficiency. Another objective is to confirm the effectiveness of the optimized diffuser vane slit
Shunya Takao, Sota Nakayama, Shinichi Konno, Yasushi Fujishima, Shinichiro Ejiri, Masahiro Miyabe   +5 more
semanticscholar   +1 more source