化工进展2017，Vol.36Issue(11)：3971-3976,6.DOI:10.16085/j.issn.1000-6613.2017-0436
方形管道内壁面微结构对湍流减阻效果的影响
Influence of wall microstructure on turbulent drag reduction in square pipe
摘要
Abstract
In the present work, the flow characteristics and drag reduction of a turbulent flow field over a riblets surface plate were investigated experimentally and compared with a smooth surface. Experimental tests were carried out in a closed rectangular duct with 1mm in width and 0.3mm, 0.5mm,0.7mm in height riblets using particle image velocimetry. Tap water was used in this experiment and test temperature was controlled at 25℃±0.5℃,and the velocity was maintained between 0.03—1.8m/s. The study showed that a notable decrease in fanning friction factor for riblets surfaces can be seen at an h+ range of 4–15 compared with flat plate. A maximum rag-reduction of nearly 11.91 percent was acquired over the riblets surface of 1 mm wide and 0.5 mm height. Riblet can thicken the boundary layer and weaken turbulent fluctuation intensity. Furthermore,both Reynolds shear stress and vorticity and root-mean-square velocity were decreased.关键词
壁面微结构/范宁系数/减阻率/雷诺应力/涡量Key words
wall microstructure/fanning friction factor/drag reduction rate/Reynolds shear stress/vorticity分类
数理科学引用本文复制引用
李恩田,吉庆丰,庞明军..方形管道内壁面微结构对湍流减阻效果的影响[J].化工进展,2017,36(11):3971-3976,6.基金项目
国家自然科学基金(51376026)及江苏省高校自然科学研究重大项目(15KJA470001). （51376026）
