Synthetically Generated Turbulent Boundary-Layer Development and Structure
Synthetically Generated Turbulent Boundary-Layer Development and Structure
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综合生成的湍流边界层发展和结构
DOI：
10.2514/3.9557
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发表时间：
1985
期刊：
影响因子：
2.5
通讯作者：
F. Chambers
中科院分区：
文献类型：
--
作者：
F. Chambers
进行了实验研究湍流边界层表面摩擦阻力的减少，可以通过控制的空间和时间尺度的边界层的创建。实验的目的是确定任何阻力减少的幅度，并阐明流动的湍流结构。进行平均和波动速度的测量，提供平均速度剖面，湍流强度剖面，爆裂频率，VITA有条件的平均速度，和合奏相平均速度在合成产生的湍流边界层和参考湍流产生的二维行程。没有发现明显的阻力减小，因为流动的变化似乎是边界层发展的有效起源的变化形式。然而，合成边界层中的外流被改变，保持了生成的某些周期性。
Experiments were conducted to investigate the turbulent boundary-layer skin-friction drag reductions that could be attained through the creation of boundary layers with controlled spatial and temporal scales. The goals of the experiments were to determine the magnitude of any drag reductions and to illuminate the turbulent structure of the flow. Measurements of mean and fluctuating velocities were performed, providing mean velocity profiles, turbulence intensity profiles, bursting frequency, VITA conditionally averaged velocity, and ensemble phase-averaged velocity in the synthetically generated turbulent boundary layer and a reference turbulent flow produced with a two-dimensional trip. Significant drag reductions were not found as the changes in the flow appeared to be of the form of shifts in the effective origin of the boundary-layer development. However, the outer flow in the synthetic boundary layer was altered, maintaining some of the periodicity of the generation.