潜航体激发类开尔文内波的垂向数值纹影实验研究

运用垂向数值纹影实验技术(NSS_V),研究了潜航体模型在线性分层流体中激发内波的形态特征,测量了类开尔文V形内波的张角、航行方向内波波长 λx与内弗罗德数(Fr=U/DN)之间的关系.实验表明:V型内波张角随着弗罗德数增大而减小,在Fr=1附近出现一个异常缓变平台;波峰线相关波长 λx与弗罗德数呈线性关系:λx=8.57Fr+1.74.对比实验表明潜航体的指挥塔对三维内波流场影响主要表现为其体积效应及角区的湍流尾迹效应.

Experimental research on Kelvin class wake of underwater moving body by vertical numerical synthetic schlieren

Apply from of the Vertical Numerical Synthetic Schlieren (NSS_V), studied morphological character of in-ternal wave by underwater moving body in the stratified fluid with a linear density distribution, angle of Kelvin class wake, sailing direction wave wavelength with Froude number (Fr=U/DN) were measured. Angle of Kelvin class wake decreases with the increase of Froude number, and has an abnormal slowly changing platform appears in the vicinity of Fr=1; There is a linear relationship between wavelength of wave crest line λx and Froude number is λx=8.57Fr+1.74. In addition, experi-ments show that the influence of submerged body command tower of three-dimensional flow field of internal wavesmainly manifested as the volume effect and the turbulent wake effect by angular region.