Experimental study of the unsteady aerodynamic field outside a tunnel during a train entry

2001 ◽  
Vol 30 (2) ◽  
pp. 221-228 ◽  
Author(s):  
B. Auvity ◽  
M. Bellenoue ◽  
T. Kageyama
Keyword(s):  
Experimental Study ◽  
Unsteady Aerodynamic ◽  
Aerodynamic Field

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

An Experimental Study on Partial Admission in a Two-Stage Axial Air Test Turbine With Numerical Comparisons

2004 ◽  
Author(s):  
Jens E. Fridh ◽  
Birute Bunkute ◽  
Reza Fakhrai ◽  
Torsten H. Fransson
Keyword(s):  
Experimental Study ◽  
Radial Flow ◽  
Turbine Blades ◽  
Two Stage ◽  
Cold Flow ◽  
Unsteady Aerodynamic ◽  
Turbine Efficiency ◽  
Partial Admission ◽  
First Results ◽  
Steam Turbine Blades

This paper presents ongoing experimental aerodynamic and efficiency measurements on a cold flow two-stage axial air test turbine with low reaction steam turbine blades at different degrees of partial admission. The overall objectives of the work are to experimentally investigate and quantify the steady and unsteady aerodynamic losses induced by partial admission. The first results show that both the total-to-static turbine efficiency drops and that the efficiency peak appears at lower isentropic velocity ratios with lower degrees of admission. Detailed steady traverse measurements of the static wall pressures downstream of sector-ends show strong local variations. The pressure wake from the partial admission blockage moves almost axially through the turbine while the temperature wake is located in a tangential position that represents the position of a particle trace based on velocity triangles, in the direction of the rotor rotation. Comparisons with 2D compressible flow computations around the circumference demonstrate the importance of the radial flow component in these experiments.

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.

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

Experimental study on the restoration from a tilt-azimuth series for improvement in resolution

1995 ◽  
Vol 53 ◽  
pp. 636-637
Author(s):  
Norio Baba ◽  
Norihiko Ichise ◽  
Syunya Watanabe
Keyword(s):  
Experimental Study ◽  
Spherical Aberration ◽  
Incident Beam ◽  
Optical Parameters ◽  
Beam Tilting ◽  
Illumination Method ◽  
Restoration Method ◽  
Illumination Mode

The tilted beam illumination method is used to improve the resolution comparing with the axial illumination mode. Using this advantage, a restoration method of several tilted beam images covering the full azimuthal range was proposed by Saxton, and experimentally examined. To make this technique more reliable it seems that some practical problems still remain. In this report the restoration was attempted and the problems were considered. In our study, four problems were pointed out for the experiment of the restoration. (1) Accurate beam tilt adjustment to fit the incident beam to the coma-free axis for the symmetrical beam tilting over the full azimuthal range. (2) Accurate measurements of the optical parameters which are necessary to design the restoration filter. Even if the spherical aberration coefficient Cs is known with accuracy and the axial astigmatism is sufficiently compensated, at least the defocus value must be measured. (3) Accurate alignment of the tilt-azimuth series images.

An Experimental Study of Some Properties of Stuttered Words

1962 ◽  
Vol 5 (4) ◽  
pp. 387-394 ◽  
Author(s):  
Bruce Quarrington ◽  
Jerome Conway ◽  
Nathan Siegel
Keyword(s):  
Experimental Study
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