Effects of Adverse Pressure Gradients on Mean Flows and Turbulence Statistics in a Boundary Layer
Effects of Adverse Pressure Gradients on Mean Flows and Turbulence Statistics in a Boundary Layer
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逆压力梯度对边界层平均流量和湍流统计的影响
DOI：
10.1007/978-3-642-77674-8_2
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发表时间：
1993
影响因子：
4.6
通讯作者：
T. Tsuji
中科院分区：
文献类型：
--
作者：
Y. Nagano;M. Tagawa;T. Tsuji
提出并讨论了具有“中等”到“强”不利压力梯度的边界层中的测量结果。随着逆压梯度的增大，(上线U^+)坐标下的速度剖面低于标准对数定律，表明小层厚度减小。相应地，湍流能量分量以及边界层外部区域的雷诺剪应力峰值也相应地出现。速度波动的高阶矩也受到不利压力梯度的严重影响。在强逆压梯度流动中，大部分边界层上的速度三重积与零压力梯度流动中的速度三重积符号完全相反。
Measurements in boundary layers with ‘moderate’ to ‘strong’ adverse pressure gradients are presented and discussed. With increasing adverse pressure gradients, the velocity profile in \( {\overline U ^ + } \sim {y^ + }\) coordinates lies below the standard log law, thus indicating a reduction in the thickness of the sublayer. Correspondingly, the turbulence energy components as well as the Reynolds shear stress peak in the outer region of the boundary layer. Higher-order moments of velocity fluctuations are also seriously affected by the adverse pressure gradient. In strong adverse-pressure-gradient flows, the triple products of velocity have completely opposite signs to those in zero-pressure-gradient flows over most of the boundary layer.