2013 Fiscal Year Final Research Report
Study on the relaminarization of turbulent flows and the wall jet flows produced by eddy currents in a liquid metal MHD electrical power generator
| Project/Area Number |
23560209
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Fluid engineering
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| Research Institution | Keio University |
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Principal Investigator |
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| Co-Investigator(Renkei-kenkyūsha) |
SUGIMOTO Norihiko 慶應義塾大学, 法学部, 専任講師 (10402538)
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| Project Period (FY) |
2011 – 2013
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| Keywords | 数値流体力学 / 乱流 / 電磁流体 / LES / 渦電流 / 壁面ジェット流 |
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| Research Abstract |
We numerically assess the influence of non-uniform magnetic flux density on turbulent duct flows in a liquid metal magnetohydrodynamic (MHD) electrical power generator. As increasing the magnetic flux density (or Hartmann number), the M-shaped velocity profile produced by eddy currents develops in the plane perpendicular to the magnetic field; the maximum velocity in the sidewall layer of the M-shaped profile increases to keep the flow rate. Under the condition of a relaminarized flow, the turbulence structures align along the magnetic field and flow repeatedly like the Karman vortex sheet. At a higher Hartmann number, the wall-shear stress in the sidewall layer increases and the sidewall jets transit to turbulence.
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