PRODUCTION OF TURBULENCE NEAR A SMOOTH WALL IN A TURBULENT BOUNDARY LAYER
PRODUCTION OF TURBULENCE NEAR A SMOOTH WALL IN A TURBULENT BOUNDARY LAYER
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DOI：
10.1017/s0022112071002490
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发表时间：
1971-01-01
影响因子：
3.7
通讯作者：
REYNOLDS, WC
中科院分区：
文献类型：
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作者：
KIM, HT;KLINE, SJ;REYNOLDS, WC
采用氢泡测量和热丝测量方法研究了低速水流中平板不可压缩光滑表面边界层的结构。特别强调了壁面附近湍流产生过程的细节。在0 < y+ < 100区域，数据显示基本上所有的湍流产生都发生在间歇性的“爆发”时期。“爆发”有一些详细的描述。气泡数据中的不确定性很大，但它们具有明显的优势，可以提供作为时间和事件时间序列函数的速度曲线。这些数据表明，爆破期间的速度剖面与已知的平均剖面具有质的不同。这些观测结果也被用作讨论可能适合湍流产生的数学模型的基础。
The structure of the flat plate incompressible smooth-surface boundary layer in a low-speed water flow is examined using hydrogen-bubble measurements and also hot-wire measurements with dye visualization. Particular emphasis is placed on the details of the process of turbulence production near the wall. In the zone 0 < y+ < 100, the data show that essentially all turbulence production occurs during intermittent ‘bursting’ periods. ‘Bursts’ are described in some detail.The uncertainties in the bubble data are large, but they have the distinct advantage of providing velocity profiles as a function of time and the time sequences of events. These data show that the velocity profiles during bursting periods assume a shape which is qualitatively distinct from the well-known mean profiles. The observations are also used as the basis for a discussion of possible appropriate mathematical models for turbulence production.