直流式低速风洞壳体有限元分析
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摘要
根据试验要求所设计的直流式低速风洞为薄壁结构,风洞的风扇位于动力段内。运行过程中,动力电机不可避免地会将振动传到壳体上,诱导其振动,并影响风洞试验段的流场品质。针对此种现象,利用有限元分析方法,对壳体模型进行网格划分,分析风洞全流场和壳体模态,得到了风洞试验段湍流度和风洞壳体模态分析结果。结果表明,直流式低速风洞的壳体结构设计合理,模态频率分布适当,在保证低速风洞试验段流场品质满足实验要求的前提下,壳体发生共振的可能性很小。
The designed wind tunnel is straight-flow low-speed wind tunnel,and fan is installed in the power section of wind tunnel. The power motor will transmit vibration to the shell and induce its vibration,which affect the quality of flow field of test section. In view of this phenomenon,the whole flow field and shell mode of the wind tunnel were analyze by the finite element analysis method. The turbulence of the wind tunnel test section and the modal analysis results of the wind tunnel shell were obtained. The results show that the design of the shell structure of the straight-flow low-speed wind tunnel is reasonable and the modal frequency distribution is suitable. When the flow field quality of the low-speed wind tunnel test section meets the experimental requirements,the possibility of the resonance of the shell is very small.
The designed wind tunnel is straight-flow low-speed wind tunnel,and fan is installed in the power section of wind tunnel. The power motor will transmit vibration to the shell and induce its vibration,which affect the quality of flow field of test section. In view of this phenomenon,the whole flow field and shell mode of the wind tunnel were analyze by the finite element analysis method. The turbulence of the wind tunnel test section and the modal analysis results of the wind tunnel shell were obtained. The results show that the design of the shell structure of the straight-flow low-speed wind tunnel is reasonable and the modal frequency distribution is suitable. When the flow field quality of the low-speed wind tunnel test section meets the experimental requirements,the possibility of the resonance of the shell is very small.
引文
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[2]曲明,张国友,徐辉,等.某环境风洞主体结构的有限元分析[J].中国机械,2014(11):289-291.
[3]MOONENA P,BLOCKENA B,ROELSA S,et al.Numerical modeling of the flow conditions in a Closed-circuit low-speed wind tunnel[J].Journal of Wind Engineering&Industrial Aerodynamics,2006,94(10):699-723.
[4]王文奎,石柏军.低速风洞洞体设计[J].机床与液压,2008,36(5):93-95.
[5]王帅,刘小康,陆龙生.直流式低速风洞收缩段收缩曲线的仿真分析[J].机床与液压,2012,40(11):100-104.
[6]吕建国,康士廷.ANSYS Workbench14有限元分析自学手册[M].北京:人民邮电出版社,2013.
[7]宋学官,蔡林,张华.ANSYS流固耦合分析与工程实例[M].北京:中国水利水电出版社,2012.
[8]陈万华,王超棋.某风洞主体结构的有限元分析[J].实验流体力学,2005,19(3):90-93.
[9]唐家鹏.Fluent14.0超级学习手册[M].北京:人民邮电出版社,2013.