Near Wall Measurements for a Turbulent Impinging Slot Jet (Data Bank Contribution)
Near Wall Measurements for a Turbulent Impinging Slot Jet (Data Bank Contribution)
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DOI：
10.1115/1.1343085
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发表时间：
2001-03
影响因子：
2
通讯作者：
Jiang Zhe;V. Modi
中科院分区：
文献类型：
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作者：
Jiang Zhe;V. Modi
本文研究了狭缝射流垂直冲击靶面时靶面附近的速度场。冲击区域通过与槽齐平且平行于冲击板的限制板来限制。冲击壁与槽的距离H在2到9.2个槽宽之间变化。考虑10，000 - 30，000的射流雷诺数（基于槽宽B）。平均速度和均方根速度测量使用热线风速仪进行。利用边界层探头，以便在接近110微米0.0028B的壁距处获得测量值。这对应于一个距离约为在墙单位，并被认为是足够的，以允许在大多数条件下的壁剪力的估计。通过在已知的Blasius流中校准探头，解决了热线干扰壁面和低速校准的问题。除滞止区的剪切不能被评估，它被发现，速度分布遵循线性行为的粘性子层的任何地方沿着壁。结果表明，在距射流轴线6 ~ 8个射流宽度处，正应力峰值出现在0.04处。
The velocity field in the vicinity of a target surface with a turbulent slot jet impinging normally on it is examined. The impingement region is confined by means of a confinement plate that is flush with the slot and parallel to the impingement plate. The distanceHof the impingement wall from the slot is varied from 2 to 9.2 slot widths. Jet Reynolds numbers (based on slot widthB) of 10,000–30,000 are considered. Mean velocity and root mean square velocity measurements are carried out using hot-wire anemometry. A boundary layer probe is utilized in order to obtain measurements at a wall distance as close as 110 microns 0.0028B. This corresponds to a distance of approximatelyin wall units and is found to be adequate in order to permit an estimate of wall shear under most conditions. The problems of hot wire interference with the wall and calibration at low velocities are solved by calibrating the probe in a known Blasius flow. With the exception of the stagnation region where shear could not be evaluated, it is found that velocity profiles follow a linear behavior in the viscous sublayer everywhere along the wall. Results indicate that the peak in normal stress occurs atto 0.04 at a distance six to eight jet widths away from the jet-axis.