Experimental study of flow field characteristics and air distribution strategies on a flat plate with air injection

被引：0

作者：

Wu H. ^{[1
]}

Dong W. ^{[1
]}

Ou Y. ^{[1
]}

机构：

[1] Department of Naval Architecture Engineering, Naval University of Engineering, Wuhan

来源：

Harbin Gongcheng Daxue Xuebao/Journal of Harbin Engineering University | 2016年 / 37卷 / 09期

关键词：

Air flow rate; Distribution strategy; Drag reduction rate; Flat plate; Flow field; Local friction; Shape of air layer;

D O I：

10.11990/jheu.201506065

中图分类号：

学科分类号：

摘要：

To investigate the effect of air flow distribution on plate flow field characteristics, we conducted a plate experiment with air injection in a high-speed towing tank. We studied the influence of air flow distribution in the longitudinal and transverse directions on drag reduction and the shape of the air layer. The results show that the shape of the air-water mixed flow under the plate surface is mainly affected by flow speed and air flow rate. When the non-dimensionalized air flow rate coefficient is equal to or less than 1.554 (Cq ≤1.554), the mixed flow will be mainly bubbly flow; when Cq≥1.675, the mixed flow becomes transitional air flow that is both bubbly and stratified; and when Cq≥2.331, the mixed flow becomes air-water stratified flow. We obtained a local friction drag reduction of 100% at the lower surface of the plate near the injection. We found the drag reduction to reach 60.65% by improving the air injection strategy, and the transverse air injection ratio in the left, middle, and right chambers to be 1:4:1 in the header air injection device. We found the joint air injection of the header and central device to make no contribution to drag reduction. © 2016, Harbin Institute of Technology. All right reserved.

引用

页码：1220 / 1226

页数：6

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