Experimental investigation of high-velocity mixing/shear layer aero-optic effects

1990 ◽  
Author(s):  
David A. Kalin ◽  
S. F. Mullins ◽  
Lori C. Brooks ◽  
Timothy S. Blackwell ◽  
Daniel A. Saylor
Keyword(s):  
Experimental Investigation ◽  
Shear Layer ◽  
High Velocity

Experimental Investigation of Fish Farm Hydrodynamics on 1:15 Scale Model Square Aquaculture Cages

2016 ◽  
Vol 138 (6) ◽  
Author(s):  
Adam A. Turner ◽  
Tiger L. Jeans ◽  
Gregor K. Reid
Keyword(s):  
Experimental Investigation ◽  
Shear Layer ◽  
Current Velocity ◽  
High Velocity ◽  
Nutrient Dynamics ◽  
Flow Fields ◽  
Fish Farm ◽  
Scale Model ◽  
Hydrodynamic Drag ◽  
Velocity Deficits

Hydrodynamic drag and wake properties of square aquaculture cage arrays were studied to improve understanding of nutrient dynamics from fish cages to guide the design of integrated multitrophic aquaculture (IMTA). A 1:15 scale model array (2 × 3) of square cages was developed and deployed in a large recirculating flume tank. Drag measurements were measured for individual cages within the array relative to current velocity. Results showed the highest drag for the first row of cages, with drag reducing significantly through rows 2 and 3. A wake velocity study observed velocity deficits, wake topology, wake recovery, and turbulence in the flow fields. High-velocity deficits were measured directly behind cages within the array, causing flow to be accelerated around and below the cages. The presence of a shear layer in the wake of the cages caused high levels of turbulence downstream. These results can be used to help predict patterns of nutrients released from cages into the environment and aid in the placement of nutrient extractive species in IMTA systems.

Experimental Investigation of the Flow Through Axisymmetric Expansions

1989 ◽  
Vol 111 (4) ◽  
pp. 464-471 ◽  
Author(s):  
M. Stieglmeier ◽  
C. Tropea ◽  
N. Weiser ◽  
W. Nitsche
Keyword(s):  
Experimental Investigation ◽  
Reynolds Number ◽  
Shear Layer ◽  
Test Facility ◽  
Recirculation Region ◽  
Velocity Measurements ◽  
Forward Scatter ◽  
Separated Shear Layer ◽  
Flow Through ◽  
Diffusion Rates

This study examines the flow field in three axisymmetric expansions having diffuser half-angles of 14, 18, and 90 deg, respectively. Velocity measurements were performed at a Reynolds number of Re = 1.56 × 104 using a single component LDA operated in forward scatter. The test facility was refractive index matched, allowing measurement of the velocities U, V, W, u2, v2, w2, uv and uw upstream of, and throughout the entire recirculation region. The results indicate that the diffuser geometry influences the separated shear layer appreciably over the entire length of the diffuser section. The production of turbulence immediately after separation is much higher in the case of the 14 and 18 deg diffuser compared to the 90 deg expansion, leading to higher diffusion rates in the separated shear layer, and hence earlier reattachment of the shear layer.

An experimental investigation of high velocity impact

1971 ◽  
Vol 24 (1) ◽  
pp. 431-451 ◽  
Author(s):  
S. W. Yuan ◽  
J. P. Billingsley
Keyword(s):  
Experimental Investigation ◽  
High Velocity ◽  
High Velocity Impact ◽  
Velocity Impact

Interaction Between a Subsonic Air Jet and a Sharp Edge

1984 ◽  
Vol 8 (3) ◽  
pp. 126-132
Author(s):  
N.W.M. Ko
Keyword(s):  
Experimental Investigation ◽  
Mach Number ◽  
Shear Layer ◽  
Coherent Structure ◽  
Wake Flow ◽  
Sharp Edge ◽  
Spectral Measurements ◽  
Acoustic Feedback ◽  
Air Jet ◽  
Set Up

This paper describes an experimental investigation of a jet of Mach number 0.5 which is partially interrupted by an 180° sharp edge. Detailed Schlieren and pressure spectral measurements of the jet with the sharp edge located at different locations inside the jet have indicated the presence of the basic jet coherent structure, the axisymmetrical and azimuthal constituents and the resonances set up by the interaction of the jet flow and sharp edge. The resonances arc due not only to the interaction of the initial shear layer with the acoustic feedback from the basic coherent structure but also with the acoustic feedback from the wake vortices set up in the wake flow behind the sharp edge. For the former, dependence of the level of resonance on location of the sharp edge has also been found.

Sign in / Sign up

Export Citation Format

Share Document