Bifurcation characteristic of two-phase flow in natural circulation system with low steam quality

Based on the one-dimensional two-phase drift flow model, the simulation of natural circulation system characteristic under HTRL-5 condition was performed. The bifurcation characteristic of two-phase flow system as well as the parameter effect under natural circulation condition was analyzed. The results show that the bifurcation phenomenon occurs under certain conditions and it occurs at the tangent point of the characteristic curve of the system. The bifurcation phenomenon disappears while the system pressure increases or the heat flux decreases to some extent. (authors)