摘要
以二维无限长圆柱在水下的垂向振动为例,对其有限区域的不可压缩流场进行分析;通过数值计算并借鉴刘易斯法,分析了水域宽度比、水深比和浸没深度比等无量纲参数对刚体附连水质量的影响;提出了水下航行器附连水质量的快速预测公式.结果表明:刚性壁面可使刚体的附连水质量增大,但当刚体与壁面的距离增加到一定程度(截面半径的5倍)时,刚性壁面的影响可以忽略;自由表面可使刚体的附连水质量减小,当刚体与自由表面的距离达到截面半径的6倍时,可以忽略自由表面的影响;当刚体的垂向运动频率较高或刚体与自由表面的距离较大时,可以认为自由表面的速度势为零.
The model of an infinite long cylinder submerged in fluid,which vibrates vertically,was investigated in this paper.Based on the analysis of incompressible flow field in limited area,the influence of fluidwidth,fluid-depth and submerge enceratioon added mass was analyzed using numerical computation.Thus,based on Lewis＇ method,a fast prediction formula for added mass of underwater vehicle was proposed.The results show that the rigid wall leads to an increase in added mass,but as the distance increases（usually 5times the cross-sectional radius）,the effect of the wall can be neglected.However,the free surface may reduce the added mass,and the effect can be ignored when the distance between the cylinder and the free surface is up to 6times the cross-sectional radius.The velocity potential on the free surface can be considered as zero only when the cylinder is vibrating at a high frequency or is far away from the free surface.
出处
《上海交通大学学报》
EI
CAS
CSCD
北大核心
2016年第2期176-181,共6页
Journal of Shanghai Jiaotong University
基金
国家自然科学基金项目(51109131)资助
