2007 Fiscal Year Final Research Report Summary
Experimental Investigation of Interaction Process between a buoyant jet and Large-Scale Turbulence
| Project/Area Number |
18560166
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Fluid engineering
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| Research Institution | Toyohashi University of Technology |
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Principal Investigator |
SEKISHITA Nobumasa Toyohashi University of Technology, Department of Engineering, Associate Professor (70283489)
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| Project Period (FY) |
2006 – 2007
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| Keywords | Large-Scale Turbulence / Heated Jet / Surface Boundary Layer / Heat and Mass Transfer / buoyancy / Wind Tunnel Experiment / Flow Visualization / Hotwire Measurement |
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| Research Abstract |
In the present research, the effects of large-scale turbulence, velocity shear and buoyancy on coherent structures were experimentally investigated in a heated jet. Large-scale turbulent fields were generated by a turbulence shear flow generator with an active grid. How visualization and measurement of velocity and temperature fields were conducted by a smoke wire method and a thermal anemometer, respectively.
(1) In the far region from a jet exit in a large-scale turbulence field, the heated jet was affected by the large-scale turbulent eddy. Temperature fluctuation in the heated jet was intermittent and the meandering motion of the heated jet occurred in the wind tunnel.
(2) In the case of single heated jet, buoyancy force has an effect on the behavior of vortex structures and the potential core inside of the jet.
(3) The stable vortex pairing and the steady occurrence of the large vortex were scarcely observed in the buoyant jet. The buoyant jet became turbulent from more upstream than the unheated jet
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