【摘要】 气空间在核反应堆及各类热能动力装置是不可避免的，为解决其对系统流动稳定性的影响，在清华大学核能技术设计院的热工水力模拟实验系统上做了实验。结果表明，气空间容积较小时流动稳定性强。通过分析参量之间的关系式，提出气空间容积对系统中重要参数之间反馈关系的影响机理： 气空间容积小，则其压力对系统扰动较为敏感。压力的改变通过对入口欠热度和空泡份额的影响抑制了流量的波动。更多还原

【Abstract】 The gas space in nuclear reactors and many kinds of heat energy power installations are not avoiable. To understand their influence to the flow stability of the system, an experiment was carried out on the thermohydraulic simulation test system HRTL 5 in INET, Tsinghua University. Results show that the smaller gas space volume is, the better the flow stability is. The influence mechanism of the feedback relation between the gas space volume and important parameters of the system is advanced: for a smaller gas space volume, its pressure is sensitive to the harassment of the system.The variation of the pressure restrains the wave of the mass flow, by means of influencing the degree of subcooling of the inlet and the void fraction.更多还原