摘要
在低速风洞中使用热线风速仪测试了光滑表面和脊状表面同一位置处的边界层流向速度分布。对比分析湍流统计平均量发现,有减阻效果的脊状表面使近壁区流速变大、湍流度降低,但对高阶矩的影响不明显;通过计算动量损失厚度,发现脊状表面具有超过10%的减阻量。
Measurements on velocity distributions in boundaries at the same point over smooth and riblet surface were carried out by means of hot-wire anemometer in low-speed wind tunnel. It was found that the riblet surface, having drag reducing effect, can increase near-wall flow velocity and decrease turbulent intensity, but have little influence on high-order moment by contrasting and analyzing the turbulence statistical average values, and have more than 10 percent drag-reduction by calculating momentum loss thickness.
出处
《兵工学报》
EI
CAS
CSCD
北大核心
2009年第6期769-772,共4页
Acta Armamentarii
基金
国家自然科学基金面上项目(10672136)
国家自然科学基金重点项目(50835009)
西北工业大学科技创新基金项目(2008KJ02012)
关键词
流体力学
风洞
热线风速仪
脊状表面
湍流度
减阻
hydromechanics
wind tunnel
hot-wire anemometry
riblet surface
turbulent intensity
drag-reduction
