scholarly journals Experimental study of the unsteady aerodynamic loading for a tandem cylinder configuration

2019 ◽  
Author(s):  
Reza Maryami ◽  
Syamir Alihan Showkat Ali ◽  
Mahdi Azarpeyvand ◽  
Ali Dehghan ◽  
Abbas Afshari
Keyword(s):  
Experimental Study ◽  
Aerodynamic Loading ◽  
Unsteady Aerodynamic

scholarly journals An Experimental Investigation of the Surface Pressure Fluctuations for Round Cylinders

2018 ◽  
Vol 141 (6) ◽  
Author(s):  
R. Maryami ◽  
M. Azarpeyvand ◽  
A. A. Dehghan ◽  
A. Afshari
Keyword(s):  
Experimental Study ◽  
Surface Pressure ◽  
Vortex Shedding ◽  
Pressure Fluctuations ◽  
Flow Structures ◽  
Bluff Bodies ◽  
Number Range ◽  
Aerodynamic Loading ◽  
Unsteady Aerodynamic ◽  
Round Cylinder

An experimental study is carried out to investigate the unsteady pressure exerted on the surface of a round cylinder in the subcritical Reynolds number range. Results are presented for the surface pressure fluctuations, spanwise coherence, lateral correlation length, and peripheral coherence. Discussions are provided for the dominance of the first three vortex shedding tones at different regions of the cylinder and the size of the flow structures around the cylinder. The dataset provided have shed new light on the unsteady aerodynamic loading acting on cylinders and provides the impetus for further research on the aerodynamics and aeroacoustics of bluff bodies.

1542 An Experimental Study on Unsteady Aerodynamic Forces Acting on a Non-Spinning Soccer Ball

2007 ◽  
Vol 2007.2 (0) ◽  
pp. 177-178
Author(s):  
Kazuya SEO ◽  
Sarah BARBER ◽  
Takeshi ASAI ◽  
Matt CARRE ◽  
Osamu KOBAYASHI
Keyword(s):  
Experimental Study ◽  
Aerodynamic Forces ◽  
Soccer Ball ◽  
Unsteady Aerodynamic

Survey of research on unsteady aerodynamic loading of delta wings

1991 ◽  
Vol 5 (4) ◽  
pp. 363-390 ◽  
Author(s):  
H. Ashley ◽  
J. Katz ◽  
M.A. Jarrah ◽  
T. Vaneck
Keyword(s):  
Delta Wings ◽  
Aerodynamic Loading ◽  
Unsteady Aerodynamic

Quantification of the Influence of Unsteady Aerodynamic Loading on the Damping Characteristics of Airfoils Oscillating at Low-Reduced Frequency—Part I: Theoretical Support

2016 ◽  
Vol 139 (3) ◽  
Author(s):  
Roque Corral ◽  
Almudena Vega
Keyword(s):  
Vibration Mode ◽  
Stokes Equations ◽  
Operating Conditions ◽  
Navier Stokes ◽  
Airfoil Surface ◽  
Navier Stokes Equations ◽  
Aerodynamic Loading ◽  
Unsteady Aerodynamic ◽  
Reduced Frequency ◽  
Frequency Regime

The effect of the unsteady aerodynamic loading of oscillating airfoils in the low-reduced frequency regime on the work per cycle curves is investigated. The theoretical analysis is based on a perturbation analysis of the linearized Navier–Stokes equations for real modes at low-reduced frequency. It was discovered that a new parameter, the unsteady loading, plays an essential role in the trends of the phase and modulus of the unsteady pressure caused by the airfoil oscillation. Here, the theory is extended in order to quantify this new parameter. It is shown that this parameter depends solely on the steady flow-field on the airfoil surface and the vibration mode-shape. As a consequence, the effect of changing the design operating conditions or the vibration mode onto the work-per-cycle curves (and therefore in the stability) can be easily predicted and, what is more important, quantified without conducting additional flutter analysis. The relevance of the parameter has been numerically confirmed in the Part II of the paper.

Experimental Investigation of Multistage Interaction Gust Aerodynamics

1989 ◽  
Vol 111 (4) ◽  
pp. 409-417 ◽  
Author(s):  
V. R. Capece ◽  
S. Fleeter
Keyword(s):  
Axial Flow ◽  
Unsteady Aerodynamics ◽  
Unique Data ◽  
Aerodynamic Loading ◽  
Unsteady Aerodynamic ◽  
Forcing Function ◽  
Reduced Frequency ◽  
Aerodynamic Interaction ◽  
Blade Row ◽  
Potential Interactions

The fundamental flow physics of multistage blade row interactions are experimentally investigated at realistic reduced frequency values. Unique data are obtained that describe the fundamental unsteady aerodynamic interaction phenomena on the stator vanes of a three-stage axial flow research compressor. In these experiments, the effect on vane row unsteady aerodynamics of the following are investigated and quantified: (1) steady vane aerodynamic loading; (2) aerodynamic forcing function waveform, including both the chordwise and transverse gust components; (3) solidity; (4) potential interactions; and (5) isolated airfoil steady flow separation.

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