蒸汽发生器U形管湍流抖振及微动磨损研究

A study on turbulent buffeting and fretting wear of U-tube of a steam generator

建立了蒸汽发生器最大弯管半径的U形管的实体模型及梁单元模型,使用软件Abaqus显式动力学研究其振动响应。使用实体模型研究防振条(AVBs)支撑下的U形管的振动响应,并通过实体模型与梁单元模型结果的对比,研究防振条在梁单元模型中的支撑简化形式;通过改变防振条支撑间隙,研究间隙对U形管的振动响应及微动磨损的影响规律。分析表明:梁单元模型中,防振条支撑可近似简化为简支;防振条间隙增大,使U形管的支撑效果弱化,但振幅变化不大,而磨损功率下降趋势明显;蒸汽发生器的设计应综合考虑支撑有效性及磨损情况,将支撑间隙控制在合理范围内。

In this paper,a solid model and a beam element model of an outmost U-tube of steam generator were established,and its vibration response was studied by Abaqus explicit dynamics.The vibration response of the U-tube supported by anti-vibration bars(AVBs)was studied by the solid model and the simplified form of anti-vibration bars in beam element model was studied by comparing the results of the solid model and the beam element model.The effect of gap on vibration response and fretting wear of the U-tube was studied by changing the gap between the U-tube and the anti-vibration bars.The analysis shows that:in the beam element model,the anti-vibration bars can be simplified into simple support.With the gap of the anti-vibration bars increase,the support effect of the U-tube becomes weaker,but the amplitude is not sensitive,while the wear power decreases obviously.The design of a steam generator should consider the support effectiveness and wear condition comprehensively and the support gap should be controlled within a reasonable range.