某核电站高能管道甩击特性及参数影响分析
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摘要
以某典型核电站主蒸汽管道-防甩件系统为研究对象,采用有限元法分析管道发生假想破口后的甩击特性。首先建立管道-U型箍防甩件的三维有限元模型,测试材料力学性能参数,根据高能管道假想破口力学模型分析了流体喷射力,基于试验结果验证模型的准确性,然后分析管道的甩击力、位移、甩击速度和系统能量变化规律,最后研究悬臂长度、摩擦系数和初始间隙对管道甩击特性的影响.研究结果表明:管道撞击U型箍后保持稳定的小幅振动,甩击速度急剧增大后迅速下降至零值,甩击力呈150 Hz的周期性波动,喷射力做功转化为管道和U型箍的应变能;管道竖向位移随悬臂长度的增大而增大,甩击力随摩擦系数的增大而增大,甩击力还随初始间隙的增大而增大.
The pipe whip behaviour of a high energy pipe in a nuclear power plant under assumption of postulated ruptures was investigated by using the finite element method.A three-dimensional finite element model of the pipe and U-bolt restraint was built,the structural parameters of them were tested experimentally,the thrust force caused by jet flow was calculated based on the jet thrust equation,and the accuracy of the model was verified with reported experimental results.Then, the time traces of restraint force,displacement,velocity and the energy of the system were analyzed.Finally,the effects of overhang length,friction coefficient and clearance on the pipe whip behaviour of the pipe-restraints system were discussed.The research results show that the pipe oscillates with small amplitude after impacting on the U-bolt restraint,the impact velocity increases suddenly to a maximum value,and then decreases rapidly to zero, and the impact force undergoes 150 Hz periodic oscillation.The work done by thrust force is almost converted to strain energy.The vertical displacement of pipe increases with increasing overhang length,whipping force increases with increasing whipping friction coefficient and increasing primary clea-rance.
The pipe whip behaviour of a high energy pipe in a nuclear power plant under assumption of postulated ruptures was investigated by using the finite element method.A three-dimensional finite element model of the pipe and U-bolt restraint was built,the structural parameters of them were tested experimentally,the thrust force caused by jet flow was calculated based on the jet thrust equation,and the accuracy of the model was verified with reported experimental results.Then, the time traces of restraint force,displacement,velocity and the energy of the system were analyzed.Finally,the effects of overhang length,friction coefficient and clearance on the pipe whip behaviour of the pipe-restraints system were discussed.The research results show that the pipe oscillates with small amplitude after impacting on the U-bolt restraint,the impact velocity increases suddenly to a maximum value,and then decreases rapidly to zero, and the impact force undergoes 150 Hz periodic oscillation.The work done by thrust force is almost converted to strain energy.The vertical displacement of pipe increases with increasing overhang length,whipping force increases with increasing whipping friction coefficient and increasing primary clea-rance.
引文
[1] MIYAZAKI N,UEDA S,ISOZAKI T.Experimental and analytical,studies of 4-Inch pipe whip tests under PWR lOCAconditions [J].International Journal of Pressure Vessels & Piping,1983,15(2):125- 150.
[2] SALMON M A,VERMA V.Rigidplasticbeammodel for pipe whipanalysis [J].Journal of the Engineering Mechanics Division,1976,102(3):415- 430.
[3] REID S R,WANG B,ALEYAASIN M.Structural modelling and testing of failed high energy pipe runs:2D and 3D pipe whip [J].International Journal of Pressure Vessels and Piping,2011,88(5):189- 197.
[4] DUNDULIS G,ALZBUTAS R,KULAK R F,et al.Reliability analysis of pipe whip impacts [J].Nuclear Engineering and Design,2005,235(17):1897- 1908.
[5] SHAW A,ROY D,REID S R,et al.Reproducing kernel collocation method applied to the non-linear dynamics of pipe whip in a plane [J].International Journal of Impact Engineering,2007,34(10):1637- 1654.
[6] 王春霖,佘靖策,褚金华.基于LS-DYNA的主蒸汽管道甩动仿真分析 [J].核动力工程,2011,32(S1):93- 97.WANG Chun-lin,SHE Jing-ce,CHU Jin-hua.Simulation and analysis of main steam pipe whip based on LS-DYNA [J].Nuclear Power Engineering,2011,32(S1):93- 97.
[7] 袁锋,吕勇波,艾红雷,等.核辅助管道甩击及防甩支架力学分析 [J].核动力工程,2013,34(06):40- 42.YUAN Feng,Lü Yong-bo,AI Hong-lei,et al.Nuclear auxiliary pipe whip and whip restraint stress analysis [J].Nuclear Power Engineering,2013,34(06):40- 42.
[8] 孙嘉麟.核电站主管道—限制件系统甩击过程的数值模拟与简化分析 [D].哈尔滨:哈尔滨工业大学,2014.
[9] 张兴田,操丰,丁有元,等.基于双线性法的高能管道假想破口载荷分析及H型防甩击限制器设计 [J].核动力工程,2011,32(05):64- 68.ZHANG Xing-tian,CAO Feng,DING You-yuan,et al.Load analysis of hypothetical ruptures and optimum design of H-type anti-whip restraint devices for high energy pipes based on bilinearity method [J].Nuclear Power Engineering,2011,32(05):64- 68.
[10] 张瑜,丁庆荣,狄先均,等.隧道逃生管道的冲击实验与仿真模拟 [J].华中科技大学学报(城市科学版),2010,27(2):87- 89.ZHANG Yu,DING Qing-rong,DI Xian-jun,et al.Impact experiment and computer simulation of tube for design of escape passage in tunnel construction [J].Journal of Huazhong University of Science and Technology(Urban Science Edition),2010,27(2):87- 89.
[11] 刘发明,晏石林.基于ANSYS Workbench的输液管道断裂甩动分析 [J].固体力学学报,2014,35(S1):256- 260.LIU Fa-ming,YAN Shi-lin.The rapture shaking analysis of pipeline based on ANSYS Workbench [J].Chinese Journal of Solid Mechanics,2014,35(S1):256- 260.
[12] EJ/T 335—1988,压水堆核电厂假想管道破损事故防护设计准则 [S].
[13] UEDA S,KURIHARA R,MIYAZAKI N.Analytical stu-dies of four-inch pipe whip tests under BWR LOCA conditions [J].International Journal of Pressurized Vessels and Piping,1984,18(3):161- 176.
[2] SALMON M A,VERMA V.Rigidplasticbeammodel for pipe whipanalysis [J].Journal of the Engineering Mechanics Division,1976,102(3):415- 430.
[3] REID S R,WANG B,ALEYAASIN M.Structural modelling and testing of failed high energy pipe runs:2D and 3D pipe whip [J].International Journal of Pressure Vessels and Piping,2011,88(5):189- 197.
[4] DUNDULIS G,ALZBUTAS R,KULAK R F,et al.Reliability analysis of pipe whip impacts [J].Nuclear Engineering and Design,2005,235(17):1897- 1908.
[5] SHAW A,ROY D,REID S R,et al.Reproducing kernel collocation method applied to the non-linear dynamics of pipe whip in a plane [J].International Journal of Impact Engineering,2007,34(10):1637- 1654.
[6] 王春霖,佘靖策,褚金华.基于LS-DYNA的主蒸汽管道甩动仿真分析 [J].核动力工程,2011,32(S1):93- 97.WANG Chun-lin,SHE Jing-ce,CHU Jin-hua.Simulation and analysis of main steam pipe whip based on LS-DYNA [J].Nuclear Power Engineering,2011,32(S1):93- 97.
[7] 袁锋,吕勇波,艾红雷,等.核辅助管道甩击及防甩支架力学分析 [J].核动力工程,2013,34(06):40- 42.YUAN Feng,Lü Yong-bo,AI Hong-lei,et al.Nuclear auxiliary pipe whip and whip restraint stress analysis [J].Nuclear Power Engineering,2013,34(06):40- 42.
[8] 孙嘉麟.核电站主管道—限制件系统甩击过程的数值模拟与简化分析 [D].哈尔滨:哈尔滨工业大学,2014.
[9] 张兴田,操丰,丁有元,等.基于双线性法的高能管道假想破口载荷分析及H型防甩击限制器设计 [J].核动力工程,2011,32(05):64- 68.ZHANG Xing-tian,CAO Feng,DING You-yuan,et al.Load analysis of hypothetical ruptures and optimum design of H-type anti-whip restraint devices for high energy pipes based on bilinearity method [J].Nuclear Power Engineering,2011,32(05):64- 68.
[10] 张瑜,丁庆荣,狄先均,等.隧道逃生管道的冲击实验与仿真模拟 [J].华中科技大学学报(城市科学版),2010,27(2):87- 89.ZHANG Yu,DING Qing-rong,DI Xian-jun,et al.Impact experiment and computer simulation of tube for design of escape passage in tunnel construction [J].Journal of Huazhong University of Science and Technology(Urban Science Edition),2010,27(2):87- 89.
[11] 刘发明,晏石林.基于ANSYS Workbench的输液管道断裂甩动分析 [J].固体力学学报,2014,35(S1):256- 260.LIU Fa-ming,YAN Shi-lin.The rapture shaking analysis of pipeline based on ANSYS Workbench [J].Chinese Journal of Solid Mechanics,2014,35(S1):256- 260.
[12] EJ/T 335—1988,压水堆核电厂假想管道破损事故防护设计准则 [S].
[13] UEDA S,KURIHARA R,MIYAZAKI N.Analytical stu-dies of four-inch pipe whip tests under BWR LOCA conditions [J].International Journal of Pressurized Vessels and Piping,1984,18(3):161- 176.
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