A local sensor for joint temperature and velocity measurements in turbulent flows.
A local sensor for joint temperature and velocity measurements in turbulent flows.
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DOI：
10.1063/1.4989430
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发表时间：
2018-01
期刊：
影响因子：
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通讯作者：
J. Salort;E. Rusaouën;L. Robert;R. du Puits;Alice Loesch;O. Pirotte;P. Roche;B. Castaing;F. Chillà
中科院分区：
文献类型：
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作者：
J. Salort;E. Rusaouën;L. Robert;R. du Puits;Alice Loesch;O. Pirotte;P. Roche;B. Castaing;F. Chillà
我们提出了旨在测量湍流速度和温度的局部相关性的微传感器的原理。其工作原理是通用的，可以适应各种类型的流量。它基于微机械加工的悬臂，其尖端上刻有铂电阻器图案。悬臂的偏转产生局部速度的估计，而铂的阻抗产生局部温度的估计。速度测量在两种湍流射流中进行测试：一种是在室温下使用空气，这使我们能够与众所周知的校准参考风速计进行比较，另一种是在 CERN 的 GReC 射流中使用低温气态氦，这允许更大范围的解析湍流尺度。温度波动的记录在伊尔梅瑙桶中进行测试，该桶在空气中提供受控的湍流热流。加热或冷却气缸后的测量表明传感器能够正确显示温度和速度之间的互相关性。
We present the principle for a micro-sensor aimed at measuring local correlations of turbulent velocity and temperature. The operating principle is versatile and can be adapted for various types of flow. It is based on a micro-machined cantilever, on the tip of which a platinum resistor is patterned. The deflection of the cantilever yields an estimate for the local velocity, and the impedance of the platinum yields an estimate for the local temperature. The velocity measurement is tested in two turbulent jets: one with air at room temperature which allows us to compare with well-known calibrated reference anemometers, and another one in the GReC jet at CERN with cryogenic gaseous helium which allows a much larger range of resolved turbulent scales. The recording of temperature fluctuations is tested in the Barrel of Ilmenau which provides a controlled turbulent thermal flow in air. Measurements in the wake of a heated or cooled cylinder demonstrate the capability of the sensor to display the cross correlation between temperature and velocity correctly.