冷热流体通过三通混合时引起的管道系统高周热疲劳失效问题是核电厂管道系统的高危问题，本文通过数值模拟的方法讨论了近上游90°弯头不同布置方向对冷热流体混合流型的影响，并根据流型对布置在冷热混合三通上游弯头布置方向给出初步的建议。%The thermal fatigue crack caused by the cold and hotfluid mixing in a tee is a high risk issue in the Nuclear Power Plant piping system. The paper discusses the upstream bend layout direction effect on thefluid conifguration of a cold and hotfluid mixing tee by numerical simulation method to table a proposal for the upstream bend primary layout scheme.
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