Experimental Study of Flow Structures around Side-by-Side Spheres

2013 ◽  
Vol 52 (40) ◽  
pp. 14492-14503 ◽  
Author(s):  
Engin Pinar ◽  
Besir Sahin ◽  
Muammer Ozgoren ◽  
Huseyin Akilli
Keyword(s):  
Experimental Study ◽  
Flow Structures

Oscillatory Natural Convection of a Liquid Metal in Circular Cylinders

1994 ◽  
Vol 116 (3) ◽  
pp. 627-632 ◽  
Author(s):  
Y. Kamotani ◽  
F.-B. Weng ◽  
S. Ostrach ◽  
J. Platt
Keyword(s):  
Experimental Study ◽  
Natural Convection ◽  
Liquid Metal ◽  
Oscillatory Flow ◽  
Circular Cylinders ◽  
Flow Structures ◽  
Supercritical Flow ◽  
Aspect Ratios ◽  
Oscillation Frequencies ◽  
Rayleigh Numbers

An experimental study is made of natural convection oscillations in gallium melts enclosed by right circular cylinders with differentially heated end walls. Cases heated from below are examined for angles of inclination (φ) ranging from 0 deg (vertical) to 75 deg with aspect ratios Ar (height/diameter) of 2, 3, and 4. Temperature measurements are made along the circumference of the cylinder to detect the oscillations, from which the oscillatory flow structures are inferred. The critical Rayleigh numbers and oscillation frequencies are determined. For Ar=3 and φ = 0 deg, 30 deg the supercritical flow structures are discussed in detail.

scholarly journals Experimental study of coherent flow structures past a wall-mounted square cylinder

2019 ◽  
Vol 182 ◽  
pp. 137-146 ◽  
Author(s):  
Maria Ikhennicheu ◽  
Grégory Germain ◽  
Philippe Druault ◽  
Benoît Gaurier
Keyword(s):  
Experimental Study ◽  
Flow Structures ◽  
Square Cylinder ◽  
Coherent Flow Structures

Experimental study on flow structures of central blockage accidents in a rectangular channel using PIV and POD

2021 ◽  
Vol 153 ◽  
pp. 108037
Author(s):  
Dongdong Yuan ◽  
Jian Deng ◽  
Rui Han ◽  
Dongyang Li ◽  
Sichao Tan
Keyword(s):  
Experimental Study ◽  
Rectangular Channel ◽  
Flow Structures

Experimental study of the internal flow structures inside a fluidic oscillator

2013 ◽  
Vol 54 (6) ◽  
Author(s):  
B. C. Bobusch ◽  
R. Woszidlo ◽  
J. M. Bergada ◽  
C. N. Nayeri ◽  
C. O. Paschereit
Keyword(s):  
Experimental Study ◽  
Internal Flow ◽  
Flow Structures ◽  
Fluidic Oscillator

scholarly journals EXPERIMENTAL STUDY OF FLOW STRUCTURES IN A DOUBLE MEANDERING COMPOUND CHANNEL

2000 ◽  
Vol 44 ◽  
pp. 873-878 ◽  
Author(s):  
Kenichiio KOBAYASHI ◽  
Nobuyuki TAMAI ◽  
G.M.Tarekul ISlam
Keyword(s):  
Experimental Study ◽  
Flow Structures ◽  
Compound Channel

The aeroacoustics of finite wall-mounted square cylinders

2017 ◽  
Vol 832 ◽  
pp. 287-328 ◽  
Author(s):  
Ric Porteous ◽  
Danielle J. Moreau ◽  
Con J. Doolan
Keyword(s):  
Boundary Layer ◽  
Experimental Study ◽  
Reynolds Number ◽  
Wind Tunnel ◽  
Three Dimensional ◽  
Flow Structures ◽  
Hot Wire ◽  
Radiated Noise ◽  
Aspect Ratios ◽  
Square Cylinders

This paper presents the results of an experimental study that relates the flow structures in the wake of a square finite wall-mounted cylinder with the radiated noise. Acoustic and hot-wire measurements were taken in an anechoic wind tunnel. The cylinder was immersed in a near-zero-pressure gradient boundary layer whose thickness was 130 % of the cylinder width, $W$. Aspect ratios were in the range $0.29\leqslant L/W\leqslant 22.9$ (where $L$ is the cylinder span), and the Reynolds number, based on width, was $1.4\times 10^{4}$. Four shedding regimes were identified, namely R0 ($L/W<2$), RI ($2<L/W<10$), RII ($10<L/W<18$) and RIII ($L/W>18$), with each shedding regime displaying an additional acoustic tone as the aspect ratio was increased. At low aspect ratios (R0 and RI), downwash dominated the wake, creating a highly three-dimensional shedding environment with maximum downwash at $L/W\approx 7$. Looping vortex structures were visualised using a phase eduction technique. The principal core of the loops generated the most noise perpendicular to the cylinder. For higher aspect ratios in RII and RIII, the main noise producing structures consisted of a series of inclined vortex filaments, where the angle of inclination varied between vortex cells.

Effects of Suction and Injection Purge-Flow on the Secondary Flow Structures of a High-Work Turbine

2008 ◽  
Author(s):  
P. Schuepbach ◽  
R. S. Abhari ◽  
M. G. Rose ◽  
T. Germain ◽  
I. Raab ◽  
...  
Keyword(s):  
Experimental Study ◽  
High Pressure ◽  
Flow Field ◽  
Secondary Flow ◽  
Flow Structures ◽  
Turbine Efficiency ◽  
Flow Mechanisms ◽  
Purge Flow ◽  
High Work ◽  
Secondary Flow Field

In high-pressure turbines, a small amount of air is ejected at the hub rim seal, to cool and prevent the ingestion of hot gases into the cavity between the stator and the disk. This paper presents an experimental study of the flow mechanisms that are associated with injection through the hub rim seal at the rotor inlet. Two different injection rates are investigated: nominal sucking of −0.1% of the main massflow and nominal blowing of 0.9%. This investigation is executed on a one-and-1/2-stage axial turbine. The results shown here come from unsteady and steady measurements, which have been acquired upstream and downstream of the rotor. The paper gives a detailed analysis of the changing secondary flow field as well as unsteady interactions associated with the injection. The injection of fluid causes a very different and generally more unsteady flow field at the rotor exit near the hub. The injection causes the turbine efficiency to deteriorate by about 0.6%.

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