分层流体中细长体生成内波的试验研究

Experimental Study on the Generation of Internal Waves by a Slender Body in Stratified Fluid

在密度连续分布的3层流体中,对细长体运动生成的内波问题进行了模型试验研究.采用多通道电导率阵,测量分析了拖曳模型产生内波的相关速度、垂向位移场及其波形结构.结果表明,拖曳模型产生的内波可以分为两类:一类是由定常源激发的Lee波;另一类是由非定常源激发的尾迹波,而且Lee波转换为尾迹波的临界内Fr=4.

Experiments were conducted to examine the characteristics of internal waves generated by a slen der body in a continuous density stratification three-layer fluid. The correlation velocity, vertical displace ment and wave patterns for such internal waves were measured and analyzed by use of conductivity arrays. Two distinct types of internal waves were obtained where one is lee wave which is generated by the station ary source with respect to the body; the other is wake wave which is no stationary. Moreover, the transi tion between those two types of wave patterns occurs at the Froude number of approximately Fr= 4.