Simulation study of dynamic characteristic of once-through steam generator in annuli tube

The once-through steam generator in annuli tube is a new type of steam generator which applies double side to transfer heat. On the basis of the supposing that heat transfer from primary water in the center tube to secondary water is identified with that of from primary water outside the annuli to secondary water, lumped parameters that selected in reason with moving boundary is applied to simulate of dynamic characteristic of once-through steam generator in annuli tube. The results of simulation accord with the thermal-hydraulics analytical results and correlative experiment conclusions, which proves the method effectively. (authors)