The results show that,micro flow near a wall reduces capillary pressure gradient and liquid superheat as well as increasing solid-liquid interfacial thermal resistance,worsening liquid film spreading and heat transfer characteristics,effects of which are not to be neglected in the evaporating thin film region.

With the support from National Nature Science Fund, this paper includes basic research of the influence factor of the wall-wetted fuel film after spray impingement with a flat wall.

Taking the measured data of the power plant as the inputs of the model, average wall heat flux, drum pressure and steam mass flow rate in the outlet of the system are calculated; by the drives of some typical pertur.