Hydrodynamic thermionic converters power plants of spacecrafts with the superlongterm lifecicle

The device of the hydrodynamic thermionic converter of heat energy in electric is described. The hydrodynamic thermionic converter device is that in the nuclear core of it the current of flows of easy ionized plasma with high speeds will be organized (0.5-7 km/s and above). It allows to have effective areas of the cathode and hydrodynamic thermionic converter anode at distances much more than sizes, characteristic of classical thermionic converter, in 0.3-0.5 mm. Thus reliability of hydrodynamic thermionic converter due to lack of need of maintenance of the small gap and minimizing of negative effects of change of the form of the active surface of the cathode increases. Existence the easy ionized plasma causes electron transfer at the expense of the movement easy ionized plasma that leads to elimination of a space charge over the surface of issue that also allows to support rather big gap (to 5 cm and above) between the cathode and the anode at the same and best heatelectrophysical characteristics of transformation in comparison with classical thermoelectric converter...