Results 31 to 40 of about 46,505 (316)

Research on Sealed Chamber Wall Effects in an Extremely Low Wind Speed Calibration Facility

open access: yesHangkong gongcheng jinzhan, 2022
The side wall interference and disturbance reflection from the front end wall of a sealed chamber in an extremely low wind speed calibration facility operated by driving the probe in motion might have influence on the flow field inside the chamber,thus ...
ZHOU Tingbo   +6 more
doaj   +1 more source

Experimental Investigation of Lift Enhancement and Drag Reduction of Discrete Co-Flow Jet Rotor Airfoil

open access: yesApplied Sciences, 2021
Rotor airfoil design involves multi-point and multi-objective complex constraints. How to significantly improve the maximum lift coefficient and lift-to-drag ratio of rotor airfoil is a fundamental problem, which should be solved urgently in the ...
Shunlei Zhang   +4 more
doaj   +1 more source

Trailing Edge Flap Effects on Dynamic Stall Vortex and Unsteady Aerodynamic Forces on a Pitching Airfoil

open access: yesInternational Journal of Aerospace Engineering, 2022
This study focuses on the effect of the upward deflection of trailing edge flap (TEF) on the strength and trajectory of dynamic stall vortex (DSV) around a pitching airfoil by means of numerical simulations based on unsteady Reynolds-averaged Navier ...
Shi-Long Xing, He-Yong Xu, Wei-Guo Zhang
doaj   +1 more source

Sensitivity Analysis of Wing Geometric and Kinematic Parameters for the Aerodynamic Performance of Hovering Flapping Wing

open access: yesAerospace, 2023
The wing planform and flapping kinematics are critical for the hovering flight of flapping wing micro air vehicles (FWMAVs). The degree of influence of wing geometry and kinematic parameters on aerodynamic performance still lacks in-depth analysis.
Xinyu Lang   +4 more
doaj   +1 more source

Inflatable Leading Edge-Based Dynamic Stall Control considering Fluid-Structure Interaction

open access: yesInternational Journal of Aerospace Engineering, 2020
The inflatable leading edge (ILE) is explored as a dynamic stall control concept. A fluid-structure interaction (FSI) numerical method for the elastic membrane structure is constructed based on unsteady Reynolds-averaged Navier-Stokes (URANS) and a mass ...
Shi-Long Xing   +3 more
doaj   +1 more source

Multipoint high-fidelity CFD-based aerodynamic shape optimization of a 10 MW wind turbine [PDF]

open access: yesWind Energy Science, 2019
The wind energy industry relies heavily on computational fluid dynamics (CFD) to analyze new turbine designs. To utilize CFD earlier in the design process, where lower-fidelity methods such as blade element momentum (BEM) are more common, requires the
M. H. Aa. Madsen   +3 more
doaj   +1 more source

Side force control on slender body by self-excited oscillation flag

open access: yesTheoretical and Applied Mechanics Letters, 2016
Strong asymmetrical vortices appear on the leeward of slender body at high angles of attack, which has very unfavorable effect on the stability and control of the aircraft. A method is developed to control the side force of slender body at high angles of
Jian Zhai   +5 more
doaj   +1 more source

Optimization of a Twistable Hovering Flapping Wing Inspired by Giant Hummingbirds Using the Unsteady Blade Element Theory

open access: yesApplied Sciences, 2023
Due to the complexity of tailoring the wing flexibility and selecting favorable kinematics, the design of flapping wings is a considerably challenging problem.
Yuanbo Dong   +3 more
doaj   +1 more source

Numerical Investigation of Performance Enhancement of the S809 Airfoil and Phase VI Wind Turbine Blade Using Co-Flow Jet Technology

open access: yesEnergies, 2021
Making full use of wind energy can effectively alleviate the global energy shortage and environment contamination problems. Nevertheless, how to significantly improve the performance of the wind turbine airfoil and blade is a crucial issue.
Shunlei Zhang, Xudong Yang, Bifeng Song
doaj   +1 more source

Review of the Co-flow Jet Flow Control Method

open access: yesHangkong gongcheng jinzhan, 2022
The co-flow jet(CFJ)is a new concept flow control method based on blowing and suction technology.Since it was proposed,it has gradually attracted extensive attention.This paper reviews the basic principles,concepts,research methods and progress of CFJ ...
XU Heyong, MA Chengyu
doaj   +1 more source

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