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中文摘要：
利用空气-水试验回路，模拟了超临界变压运行直流锅炉在35％、50％和75％额定负荷（ECR）下汽-液两相流在中间集箱中的分配特性．采用快关阀门法和摩擦阻力法分别测量了各支管内的体积含气率和流量分布．试验结果表明：在入口干度x=0．7～0．95的范围内，35％ECR下并联支管的含气率分布最均匀，随着负荷的增加，各支管间的相分配偏差增加；锅炉负荷增加时，并联支管内流量分配的均匀性增加．
英文摘要：
The distribution characteristics of steam-liquid two phase flow in the intermediate headers of the supercritical one-through boiler were simulated under the condition of 35%, 50% and 75% ECR with variable pressure operation based on an air-water test circuit. The volumetric fractions of air content and flow rate in each branch were measured by use of the quick-close valve method and frictional resistance method respectively. Test results show that the air fraction distribution in the parallel branch is the most uniform under 35% ECR when the inlet dryness x is in the range of 0.7-0.95. With the increase of load, the deviation of phase distribution among branches increases, and the uniformity of flow distribution also increases.
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