With an example of a section of air duct with a tee, analyses the existing problems when adjusting pipe diameter according to the pressure balance formula and the causes.
以一段带三通的并联风管为例，分析了根据该压力平衡公式调整管径时存在的问题及其原因。
The main source of these failures are vortices existing, in front of Tee-Junctions of entering headers of superheaters and reheaters, caused by the complex flow conditions in the headers.
发生事故的主要原因之一是过热器、再热器进口集箱引入三通处蒸汽在集箱中复杂流动工况下产生涡流，处在涡流区的管屏蒸汽流量减少，使汽温和金属壁温升高。
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