The response to temperature fluctuations of a constant-current hot-wire anemometer
The response to temperature fluctuations of a constant-current hot-wire anemometer
复制标题
恒流热线风速计对温度波动的响应
DOI：
10.1088/0022-3735/11/9/012
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发表时间：
1978
期刊：
影响因子：
--
通讯作者：
P. H. Hoffmann
中科院分区：
文献类型：
--
作者：
A. Smits;A. Perry;P. H. Hoffmann
研究了用于测量湍流气体中温度波动的恒流热线风速计系统的性能。推导了温度-速度灵敏度比，讨论了灵敏度和时间常数行为。当考虑端部导通时，动态灵敏度可能与静态灵敏度有很大的不同，这种差别发生在大约1/6赫兹。给出的一般分析表明，在导线时间常数的数量级频率上，如果热线系统由RC网络补偿，则响应发生进一步的步骤。这与低频行为结合在一起，导致频率响应曲线出现相当大的下降，该下降发生在实验室产生的湍流热波动的含能范围的中心。描述了辐射热流实验，这些实验证明了这些现象，并使误差能够被估计和对系统进行适当的调整。文中还讨论了测量温度波动所涉及的这些困难和其他困难。
The behaviour of a constant-current hot-wire anemometer system used for the measurement of temperature fluctuations in a turbulent gas is studied. The temperature-to-velocity sensitivity ratio is derived and the sensitivity and time constant behaviour are discussed. When end conduction is taken into account the dynamic sensitivity may be quite different from the static sensitivity and the difference occurs at about 1/6 Hz. A general analysis is presented which shows that at frequencies of the order of the time constant of the wire, a further step in the response occurs if the hot-wire system is compensated by an RC network. This, when combined with the low-frequency behaviour, leads to a considerable dip in the frequency response curve, the dip occurring in the centre of the energy-containing range of laboratory-produced turbulent thermal fluctuations. Radiant heat flux experiments are described which demonstrate these phenomena, and enable errors to be estimated and appropriate adjustments to the system to be made. These and other difficulties involved in measuring temperature fluctuations are discussed.