海洋科学2017，Vol.41Issue(9)：114-122,9.DOI:10.11759/hykx20170404001
下凹内孤立波致流场结构及其影响因素的实验研究
Experimental study on the flow field induced by internal solitary waves and its influence factors
摘要
Abstract
To study the influence of the flow field induced by internal solitary waves (ISWs) on marine engineering structures and underwater vehicles, in a large-scale gravity-stratified fluid tank, the velocities of a series of ISWs created by gravity collapse were measured using particle image velocimetry (PIV) and its wave-induced flow field and influence factors were quantitatively analyzed. Experimental results show that the PIV technique can realize the fine measurement for the flow field induced by the large-scale solitary wave in the density-stratified fluid. The di-rection of the horizontal velocity below the wave profile is opposite to the one in the upper-layer fluid and the minimum velocity appears at the pycnocline, whereas the horizontal shear is the strongest near the pycnocline. The vertical flows at the front and rear of the ISWs are the descending and ascending flows, respectively, and achieve their maximums at a position that is 1/4–1/2 times the wavelength away from the trough. The velocity values at the same amplitude increase with increasing differences of density and thickness between the upper and lower layers. Moreover, as the amplitude increases, the flow field structures successively coincide with the description of the KdV, eKdV, and MCC theoretical models in their applicable ranges.关键词
分层流/内孤立波/粒子图像测速(Particle Image velocimetry,PIV)技术/流场特性/水槽实验Key words
stratified fluid/internal solitary wave/PIV/flow field/experiments in water tank分类
海洋科学引用本文复制引用
武军林,魏岗,杜辉,徐峻楠..下凹内孤立波致流场结构及其影响因素的实验研究[J].海洋科学,2017,41(9):114-122,9.基金项目
国家自然科学基金项目(11472307) （11472307）
国防技术基础项目(QX2015043104A12002)National Natural Science Foundation of China, No.11472307 （QX2015043104A12002）
Defense Technology Foundation Project, No. QX2015043104A12002 （）
