低压低干度自然循环汽水两相流流量振荡特性

OSCILLATION CHARACTERISTICS OF TWO PHASE FLOW IN A NATURAL CIRCULATION SYSTEM WITH LOW PRESSURE AND LOW STEAM QUALITY

实验研究了低压低干度汽水两相混合物在自然循环条件下产生密度波不稳定性时的流量振荡特性。实验在大型热工水力学实验回路ＨＲＴＬ－２００上以水为工质进行，压力为１．０—４．０ＭＰａ，加热功率为２７—１９０ｋＷ，人口欠热度为５—８０℃，加热段出口质量含汽率小于５％。实验参数范围包括了２００ＭＷ核供热堆微沸腾工况运行的参数。获得了有关自然循环流量振荡模式、相对振幅、振荡周期等振荡特性参数随系统压力。

When a natural circulation system is operated under low pressure and low steam quality,the oscillation behavior of the flow rate of the steam water mixture in this system is studied.The experimental work was done using water as coolant on the test system HRTL 200 under 1 0—4 0 MPa of pressure,27—190 kW of heating power,5—80 ℃ of inlet subcooling and less than 5% of outlet steam quality.The range of experimental parameters covers those of the district heating reactor 200 MW. The experimental results about the effect of system pressure,heating power and coolant subcooling on the relevant amplitude of natural circulation flow rate and the oscillation periods are presented.