Abstract
The object of the numerical investigations is the effect of gasdynamic fluctuations of plasma flow, under the assumption of fully developed turbulence, on the performances of the ideal non-equilibrium MHD-generator. The numerical investigations are carried out on the basis of the quasi-one-dimensional timedependent numerical model, which takes into account turbulent effects. Because of the comparatively high Reynolds number, all of the relevant scales of motion cannot be captured by the numerical grid scheme, and the effect of small scale eddies (less than the mesh size) is accounted by the subgrid-scale eddy turbulent viscosity model. The direct numerical simulation is used for large scale eddies (larger than the mesh size). Mainly, the investigations were conducted in the interval of middle and low values of external load resistances, which corresponds to the stable and the unstable areas on the Voltage-Current characteristic. The results of the numerical simulations show the development of the additional MHD viscosity in unstable regions on the Voltage-Current characteristic.
