基于喉部出口流场的电站凝汽器管束汽流激振评估的数值研究

Numerical Study on the Evaluation of Steam-induced Vibration of Power Station Condenser Tube Bundles Based on the Flow Field at the Throat Outlet

管束汽流激振现象的避免可以提高电站机组凝汽器的安全保障。采用数值模拟方法,对凝汽器喉部的蒸汽流动进行模拟,在基于喉部出口流场分布的基础上,选用判别汽流激振的工程经验公式——Peake C.C.公式完成了对管束汽流激振的评估研究。研究结果表明,不同工况下喉部出口的流场分布有所不同,在喉部出口二维截面上评估出的可能发生汽流激振的位置也不同,但部分区域在不同工况下均存在较大的汽流激振可能性,建议在该区域采取防范措施。

Avoiding the steam-induced vibration of tube bundles can improve the safety of the condenser of the power station unit.In this paper,the numerical simulation method is used to simulate the steam flow in the throat of the condenser.Based on the flow field at the outlet of the throat,the Peake CC formula,which is an engineering empirical formula for judging the excitation of steam flow,is used to evaluate the steam-induced vibration of the tube bundles.The research results show that the flow field at the throat outlet is different under different working conditions.The possible locations of steam-induced vibration evaluated on the two-dimensional section of throat outlet are also different.But there is a great possibility of steam-induced vibration in same areas under different working conditions,and it is recommended to take preventive measures in this area.