乱流MHD相関量の評価とファラデー形MHD発電特性に及ぼす影響

抄録

Turbulent magnetohydrodynamical correlations between the conductivity and the electric field σ'E' and those between the current density and the electric field J'·E' in the mean MHD governing equations were evaluated using simulated fluctuation data of the velocity and temperature. The instantaneous electrical equations were solved in the cross section of a Faraday-type MHD channel driven by a combustion plasma in chemical equilibrium. It was clarified that both σ'E'_y and J'_yE'_y are large values in the vicinity of electrodes. Therefore, they might play an important role in the mean boundary layer phenomena and arc behavior. However, they hardly affect the gross output characteristics of the generator, because the mean electrical conductivity is enhanced by the temperature turbulence. We also showed that the mean correlations σ'E'_x, σ'E'_z, J'_xE'_x and J'_zE'_z are negligiblly small.