论文部分内容阅读
在5MW低温供热堆热工水力学实验台架HRTL-5上,以水为工质,进行了低压自然循环两相流流型及流型对密度波不稳定性影响的实验研究。结合可视化观察,利用局部差压信号进行流型鉴别。提出了Sr数可以很好地鉴别不同流型,具有明确的物理意义。描述了系统压力为1.5MPa,0.24MPa及0.1MPa下不同工况的流型,认为在1.5MPa工况下发生低干度密度波不稳定时,流型为泡状流,无流型转换,在流型为泡状流向间歇流过渡区时不会引起密度波不稳定。分析了常压稳定闪蒸时上升段出口的流型。在低温供热堆全参数、全尺寸模拟系统中,进行两相流流型的分析研究,对充分认识低温供热堆中各种工况下的流动形态提供了直接的有价值的成果。
Experimental study on the influence of flow pattern and flow pattern on density wave instability of low pressure natural circulation was carried out on HRTL-5, a thermal hydraulics experimental stand for 5MW low temperature heating reactor. Combined with visual observation, the use of local differential pressure signal flow identification. The number of Sr is proposed to identify different flow patterns well and has definite physical meaning. The flow regime under different operating pressures of 1.5MPa, 0.24MPa and 0.1MPa is described. It is considered that when the density of low dry density waves is instable at 1.5MPa, the flow regime is bubbly flow and no flow transition, When the flow pattern is bubbly flow to the intermittent flow transition zone, the density wave will not be instable. The flow pattern at the outlet of rising section under steady pressure and steady pressure was analyzed. In the low temperature heating reactor full parameter and full scale simulation system, the two phase flow pattern is analyzed and studied, which provides direct and valuable results for fully understanding the flow patterns under various conditions in the low temperature heating reactor.