两相自然循环系统静态流量漂移及其实验验证

本文基于均相模型,运用非线性分岔理论,计算预测了两相自然循环系统静态分岔(流量漂移)解图。定义了对应系统静态分岔点的理论最大输热能力限,讨论了实际流量漂移发生点。同时分析了系统的迟滞效应及系统压力、入口阻力等对分岔解图的影响。首次用针对性实验验证了两相自然循环静态分岔及其迟滞现象;对有关参数效应亦进行了实验验证研究。

STATIC FLOW EXCURSION OF TWO-PHASE NATURAL CIRCULATION AND EXPERIMENTAL VERIFICATION

Based on homogeneous model and with the application of nonlinear bifurcation theory, this paper presents prediction of static bifurcation (flow excursion) diagram of two-phase natural circulation. Theoretical maximum capacity of heat load, which corresponds to the static bifurcation point of the system, is defined. And heat load where flow excursion actually occurs is discussed. Meanwhile, hysterisis characteristics and effects of such parameters as system pressure, inlet local loss etc. on the system bifurcation diagram are analyzed. Furthermore, in this paper, it is for the first time that static bifurcation and hysterisis phenomenon in two-phase natural circulation system are experimentally verified. Finally, related parametric effects are verified and investigated in the experiment as well.