Comparative study of a vertical round jet in regular and random waves

Comparative study of a vertical round jet in regular and random waves
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规则波和随机波中垂直圆形射流的对比研究

DOI:
10.1016/j.oceaneng.2014.08.005
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发表时间:
2014-10
期刊:
影响因子:
5
通讯作者:
F. Hu
F. Hu
中科院分区:
工程技术2区
文献类型:
--
作者:
Z. S. Xu;Y. P. Chen;C. K. Zhang;C. W. Li;Y. N. Wang;F. Hu

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对规则波和随机波中垂直圆形射流的水动力行为进行了比较研究。规则波和随机波是根据等效能量密度和能量通量的概念来选择的。首先进行实验研究,比较不同垂直高度的射流平均轴向速度的横向剖面。结果表明,在现有实验条件下,规则波中出现“双峰”现象,而相应的随机波中几乎不存在“双峰”现象。这导致规则波中的射流沿中心线的轴向速度较低。随后开发了大涡模拟(LES)模型,以量化与实验室相同的波浪条件下射流半宽度的差异。数值结果表明,随机波中的射流比规则波中的射流半宽度更大,这与实验室实验中的目视观察结果一致。对不同规则波和随机波中射流的更多情况进行了数值研究,结果表明,随机波条件下也可能出现“双峰”,但需要更大的波与射流动量比。
The hydrodynamic behaviors of a vertical round jet in regular and random waves are comparatively investigated. The regular and the random waves are chosen based on the concept of equivalent energy density and energy flux. The experimental study is first carried out to compare the lateral profiles of jet mean axial velocity at various vertical levels. The results show that, under the present experimental conditions, the phenomenon of “twin peaks” appears in the regular waves, but virtually does not exist in the corresponding random waves. This results in a lower axial velocity along the centerline for the jet in the regular waves. A large eddy simulation (LES) model is subsequently developed to quantify the difference of jet half-width under the same wave conditions as those in the laboratory. The numerical results show that the jet in the random waves has a larger jet half-width than that in the regular waves, which is consistent with the visual observations in laboratory experiments. More scenarios of the jet in different regular and random waves are numerically investigated and the results show that the “twin peaks” may also appear under the condition of random waves, but requiring a larger wave-to-jet momentum ratio.
DOI: --
发表时间: 2009
期刊: --
影响因子: --
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