摘要
为了研究壁面微结构流动控制技术的减阻效应及其产生的原因,利用循环管路系统的方形管道进行了压降测定试验,并利用粒子成像测速仪测量了边界层内部结构和对应的参数。试验采用了沟槽和肋条两种不同类型的微结构壁面,每种形状的微结构各有3种不同的结构尺寸。试验研究结果表明:在一定的无量纲宽度s+范围内,6种不同的微结构壁面都具有减阻效果;减阻率随着s+的增大,呈现先增大后减小的趋势,其中沟槽壁面2的减阻效果最好,最大减阻率为9.90%;壁面微结构通过影响流场内部的涡结构、湍流脉动、雷诺切应力和平均流速等使得不同壁面微结构具有减阻效果。
In the present work drag reduction and its causes of wall microstructure flow control techniquehave been investigated experimentally. Pressure drop tests were carried out on a closed rectangular ductand particle image velocimetry was used to measure inner structure and corresponding flow parameters ofboundary layer. Plates with micro-grooves or micro-riblets were fixed as the floor of the duck pipe. The re-sult shows that a notable decrease in drag reduction for microstructure surfaces can be seen at a certainrange of s+. The dag reduction rate increased first then decreased with the increase of s+,and a maximumrag-reduction of nearly 9.9 percent was acquired over the micro-grooves surface B. Microstructure can thick-en the boundary layer and weaken turbulent fluctuation intensity. What's more,Reynolds shear stress,androot-mean-square velocity both decreased.
作者
李恩田
吉庆丰
庞明军
LI Entian;JI Qingfeng;PANG Mingjun(School of Hydraulic Energy and Power Engineering,Yangzhou University,Yangzhou 225127,China;School of Petroleum Engineering,Changzhon University,Changzhou 213016,China)
出处
《水利学报》
EI
CSCD
北大核心
2018年第6期767-774,共8页
Journal of Hydraulic Engineering
基金
国家自然科学基金项目(51376026)
江苏省高校自然科学研究重大项目(15KJA470001)
2017年江苏省高校中青年骨干教师境外研修计划
关键词
流动控制
壁面微结构
减阻率
雷诺应力
湍流脉动强度
flow control
wall microstructure
drag reduction rate
Reynolds shear stress
turbulent fluctuation intensity