物理学报Issue(8)：084704-1-084704-11,11.DOI:10.7498/aps.63.084704
八重准周期排列的短沟槽结构减阻机理分析
Drag reduction mechanisms of 8-fold quasi-p erio dic short gro ove structures
摘要
Abstract
We design two types of 8-fold quasi-period short groove structures which are arranged in single row and three rows respectively. The flow field in the turbulent boundary layer and the total stress over these groove surfaces are numerically simulated by using Reynolds average Navier-Stokes equation and turbulence model. It is shown that the 8-fold quasi-periodic structure has good drag reduction effect compared with the periodic and disorder structures, especially for structure arranged in three rows. The results are also confirmed by the shear stress measurements which are performed on substrates with the designed structures. By analyzing the distribution of flow field, we find that the quasi-periodic structure effectively inhibits the intensity of vortex, reduces the turbulent dissipation rate, and keeps the stripe phase stable. Furthermore, by using the two-dimensional grating model, it is found that the 8-fold quasi-periodic structure can reduce spectrum intensity in the large angle direction, revealing that the inhibition of the extension of coherence disturbance waves is responsible for the drag reduction effect, which is also confirmed by the flow field analysis.关键词
沟槽结构/涡/条纹相/八重准周期Key words
groove structure/vortex/strip phase/8-fold quasi-period引用本文复制引用
郎莎莎,耿兴国,臧渡洋..八重准周期排列的短沟槽结构减阻机理分析[J].物理学报,2014,(8):084704-1-084704-11,11.基金项目
国家自然科学基金(批准号:51301139,10872172)、高等学校博士学科点专项科研基金(批准号:20126102120058)和西北工业大学基础研究基金(批准号：JCY20130147)资助的课题.@@@@ Project supported by the National Natural Science Foundation of China (Grant Nos.51301139,10872172), the Specialized Research Fund for the Doctoral Program of Higher Education of China (Grant No.20126102120058), and Fundamental Research Foundation of Northwestern Polytechnical University, China (Grant No. JCY20130147) （批准号:51301139,10872172）
