Density Wave Instability in Once-Through Boiling Flow System, (III)

Distributed Parameter Model

抄録

The density wave instability in a once-through boiling flow system is analyzed using a comprehensive distributed parameter model that is extended from the simplified lumped parameter model presented in a companion paper. A computer code DEW is developed for the calculations with an analytical approach in the time domain. The proposed model is verified by comparison with published data obtained from experiments with a joule-heated system and a sodium-heated steam generator. This comparison indicates that the proposed model can serve as a design tool for predicting the stability boundary. Several features of oscillatory behavior, the existence of higher-mode oscillations and some analytical parameter effects on the flow instability are revealed in the present study.