Calculation of turbulent MHD boundary layer in MHD generator channels
The problem of calculating a turbulent magnetohydrodynamic (MHD) boundary layer in channels of high-temperature MHD units using a closed differential equation describing turbulent viscosity is formulated. It is shown that, to a first approximation, this equation is of the same form as in ordinary gasdynamics, and that the magnetic field affects the characteristics of the boundary layer through MHD force and heat sources that can be taken into account by averaged motion and energy equations. An approximation model is proposed to take into account Joule heat release near the cold electrode wall of the channel. MHD boundary layers are calculated for two regimes, at a constant speed of the external flow and at constant pressure. It is shown that in the first case the boundary layer is characterized, at sufficiently strong electric currents, by increasing Stanton number on the electrode wall and increasing coefficient of friction on the insulation wall. In the second case the boundary layer on the electrode separates and the flow on the insulation wall is nonstalling at practically any retardation of the external flow. (AIP)
- Research Organization:
- High-Temperature Institute, Academy of Sciences of the USSR
- OSTI ID:
- 7231077
- Journal Information:
- High Temp. (USSR) (Engl. Transl.); (United States), Journal Name: High Temp. (USSR) (Engl. Transl.); (United States) Vol. 14:3; ISSN HITEA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
300104* -- MHD Generators-- Duct Engineering & Fluid Dynamics
BOUNDARY LAYERS
DIRECT ENERGY CONVERTERS
ELECTRODES
ENERGY TRANSFER
FLOW MODELS
FLUID FLOW
FLUID MECHANICS
HEAT TRANSFER
HEATING
HYDRODYNAMICS
JOULE HEATING
LAYERS
MAGNETIC FIELDS
MAGNETOHYDRODYNAMICS
MATHEMATICAL MODELS
MECHANICS
MHD CHANNELS
MHD GENERATORS
PLASMA HEATING
TURBULENT FLOW
VISCOSITY