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Effect of gasdynamic turbulence on the integral characteristics of conduction MHD generators. (English. Russian original) Zbl 0595.76116

Magnetohydrodynamics 21, 430-436 (1985); translation from Magn. Gidrodin. 1985, No. 4, 122-128 (1985).
Experimental studies of the operational states of conduction MHD generators operating on combustion products indicate that nonstationary pulsational fields, having a negative effect on the lifetime and output characteristics of these devices, are present in the channels. Pulsations of the gasdynamic parameters of the core of the flow - the velocity u, temperature T, and pressure p - introduced from the combustion chamber or arising in the channel itself can give rise to fluctuations of the conductivity \(\sigma\), electric field E, current density j, and finally the Joule heating qv. The indicated pulsational background exists independently of the presence of external electric and magnetic fields and can be described on the basis of the theory of gasdynamic turbulence. In this case, correlation moments, containing fluctuations of the electrical parameters and the conductivity, appear in the equations of the turbulent flow and energy transfer.
These moments can in many cases be expressed in terms of moments containing the pulsations of gasdynamic parameters only.
The purpose of this work is to analyze the effect of these correlations on the integral characteristics of conduction MHD generators of different type. We shall study a flow in the core of the channel of an MHD generator in the approximation of small magnetic Reynolds numbers.

MSC:

76W05 Magnetohydrodynamics and electrohydrodynamics
76N15 Gas dynamics (general theory)
76F99 Turbulence
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