振动条件下旋流分离器内螺旋流的流固耦合研究
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摘要
旋流分离器工作时受到外部流体的影响会产生振动,从而影响内部流场分布规律。为研究振动条件下旋流分离器内螺旋流的流固耦合作用,建立振动条件下旋流分离器的双向流固耦合模型,对同种激振频率下不同激振力的流固耦合作用进行数值模拟。结果表明:螺旋流场随着结构一起运动,而结构的运动引起了流场结构的偏移;周期振动下的流场径向速度变大,并随激振力的增大而增加;周期性激振力影响了切向速度的对称性,并使轴向速度近轴区域速度变大;不同截面的结构运动轨迹呈"O"型,振动形态呈抛物线状。
The hydrocyclone is affected by the external fluid and can produce vibration,resulting to the changing the distribution of internal flows. To study the fluid-solid coupling effect of spiral flow in hydrocyclones under the condition of vibration,the two-directional fluid-structure coupling model with the same vibration frequency is established,where the fluidstructure coupling effect of different exciting forces is simulated.The results show that the spiral flow field moves together with the structure,and the motion of the structure causes the migration of the flow field.The radial velocity of the flow field in the periodic vibration becomes larger,and increases with the increase of the exciting force. The periodic exciting force affects the symmetry of the tangential velocity,and makes the axial velocity near the axial become larger. The trajectory of different cross sections of the structure takes the " O" type,and the vibration shape is parabolic.
The hydrocyclone is affected by the external fluid and can produce vibration,resulting to the changing the distribution of internal flows. To study the fluid-solid coupling effect of spiral flow in hydrocyclones under the condition of vibration,the two-directional fluid-structure coupling model with the same vibration frequency is established,where the fluidstructure coupling effect of different exciting forces is simulated.The results show that the spiral flow field moves together with the structure,and the motion of the structure causes the migration of the flow field.The radial velocity of the flow field in the periodic vibration becomes larger,and increases with the increase of the exciting force. The periodic exciting force affects the symmetry of the tangential velocity,and makes the axial velocity near the axial become larger. The trajectory of different cross sections of the structure takes the " O" type,and the vibration shape is parabolic.
引文
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[15]KHAIRY E,CHRIS L.The effect of cyclone vortex finder dimensions on the flow pattern and performance using LES[J].Computers&Fluids,2013,71:224-239.
[2]周岱,何涛,涂佳黄.流固耦合分析的一种改进CBS有限元算法[J].力学学报,2012,44(3):494-504.ZHOU Dai,HE Tao,TU Jiahuang.An improved CBS finite element method of fluid-structure interaction analysis[J].Journal of Mechanics,2012,44(3):494-504.
[3]WULF G D,DJORDJE P.On the coupling between fluid flow and mesh motion in the modelling of fluid-structure interaction[J].Computational Mechanics,2008,43(1):81-90.
[4]JAIMAN R,GEUBELLE P,LOTH E,et al.Combined interface boundary condition method for unsteady fluidstructure interaction[J].Computer Methods in Applied Mechanics and Engineering,2011,200(1/4):27-39.
[5]HE T,ZHOU D,BAO Y.Combined interface boundary condition method for fluid-rigid body interaction[J].Computer Methods in Applied Mechanics and Engineering,2012,223:81-102.
[6]冯志鹏,臧峰刚,张毅雄.三维横向流体诱发直管振动的数值模拟[J].应用数学和力学,2013,34(12):1311-1320.FENG Zhipeng,ZANG Fenggang,ZHANG Yixiong.Numerical simulation of three-dimensional lateral fluid induced straight pipe vibration[J].Applied Mathematics and Mechanics,2013,34(12):1311-1320.
[7]裴吉,袁寿其,袁建平.流固耦合作用对离心泵内部流场影响的数值计算[J].农业机械学报,2009,40(12):107-112.PEI Ji,YUAN Shouqi,YUAN Jianping.Numerical calculation of fluid-structure coupling affect on internal flow field in a centrifugal pump[J].Journal of Agricultural Machinery,2009,40(12):107-112.
[8]裴吉.离心泵瞬态水力激振流固耦合机理及流动非定常强度研究[D].镇江:江苏大学,2013.PEI Ji.The research of fluid-structure interaction mechanism of transient hydraulic vibration and the unsteady flow intensity of centrifugal pump[D].Zhenjiang:Jiangsu University,2013.
[9]胥锋.压电泵的流固耦合仿真分析及试验研究[D].长春:吉林大学,2015.XU Feng.The fluid-solid coupling of simulation analysis and experimental research of piezoelectric pump[D].Changchun:Jilin University,2015.
[10]谭越,马文星,卢秀泉.基于流固耦合的冲焊型液力变矩器焊接强度分析[J].吉林大学学报(工学版),2013,43(4):928-932.TAN Yue,MA Wenxing,LU Xiuquan.The welding strength analysis of welding type hydraulic torque converter based on the fluid-structure interaction[J].Journal of Jilin University(Engineering Science),2013,43(4):928-932.
[11]王维忠,仝兴华,闫立志,等.斜管组油水分离装置的结构优化研究[J].中国石油大学学报(自然科学版),2015,39(1):122-127.WANG Weizhong,TONG Xinghua,YAN Lizhi,et al.The structure optimization research of oil-water separation devices of inclined tube group[J].Journal of China University of Petroleum(Edition of Natural Science),2015,39(1):122-127.
[12]谢超.气液两相流管道振动特性研究[D].青岛:中国石油大学,2010.XIE Chao.The vibration characteristic research of gasliquid two phase flow pipeline[D].Qingdao:China University of Petroleum,2010.
[13]邱亚东,王尊策,李翠艳,等.流固耦合效应下水力旋流器变径圆管振动特性研究[J].化工机械,2015,42(2):240-244.QIU Yadong,WANG Zunce,LI Cuiyan,et al.Study on vibration characteristics of hydrocyclone reducing pipe based on fluid-solid couping[J].Chemical Machinery,2015,42(2):240-244.
[14]李森,张健,王尊策,等.流固耦合作用下水力旋流器内流场的数值模拟[J].化工机械,2015,42(5):706-710.LI Sen,ZHANG Jian,WANG Zunce,et al.Numerical simulation of hydrocyclone's inner flow field under fluid structure interaction[J].Chemical Machinery,2015,42(5):706-710.
[15]KHAIRY E,CHRIS L.The effect of cyclone vortex finder dimensions on the flow pattern and performance using LES[J].Computers&Fluids,2013,71:224-239.