论文成果
Effect of exit geometry of blowing air on friction drag of an underwater plate
摘要:Air layer drag reduction (ALDR) is one of the important techniques for reducing the frictional resistance of ships and underwater vehicles. The air injection configuration directly influences air layer coverage on the surface and hence drag reduction. Several shapes of air exit have been investigated in the past, including narrow slots, regular-shaped holes, porous media, and arrays/combinations of them. A new exit shape, i.e. modified Nekomimi, is proposed and investigated numerically for ALDR of an underwater flat plate. The work is inspired by air film cooling technology where it is desirable to have an air layer segregating wall from main gas flow. The Reynolds number examined is 6970-22890, based on local turbulent boundary layer thickness, for the incoming water flow or 700-5550, based on the equivalent exit diameter of blowing air. Results show that the Nekomimi exit produces a larger and more even air layer coverage, as indicated by the air volume fraction on the plate, accounting for a more pronounced drag reduction and net energy saving than a circular exit with the same area or spanwise dimension. Multi-Nekomimi-exit arrangement is also investigated to obtain a larger air-layer coverage on the plate, showing good promise in engineering applications.
关键字:Air layer drag reduction; Underwater plate; Nekomimi geometry
ISSN号:0029-8018
卷、期、页:卷: 257
发表日期:2022-08-01
影响因子:3.795000
期刊分区(SCI为中科院分区):三区
收录情况:SCIE(科学引文索引网络版),地学领域高质量科技期刊分级目录(国外T1),EI(工程索引)
发表期刊名称:OCEAN ENGINEERING
参与作者:Zheng, Zhanying,Liu, Hua-ping,Zhou, Yu
第一作者:冯岩岩
论文类型:期刊论文
论文概要:冯岩岩,Zheng, Zhanying,Liu, Hua-ping,Zhou, Yu,Effect of exit geometry of blowing air on friction drag of an underwater plate,OCEAN ENGINEERING,2022,卷: 257
论文题目:Effect of exit geometry of blowing air on friction drag of an underwater plate