Variations in fluid temperature are the most important error source in hot-wire anemometer measurements and must sometimes be compensated for. Although many temperature compensation schemes have been proposed over the years, no consensus seems to be reached regarding correction methods. In this paper new precision measurements on heat transfer from heated wires have confirmed that, provided the fluid properties are evaluated at the mean temperature between the air and sensor temperatures, the Nusselt number is a consistent function of the Reynolds number without any further corrections. Based on this knowledge a new calibration function which accounts for temperature dependencies in fluid properties is proposed. The aim has been to come up with a calibration function that is useful in practical anemometry. The only parameters in the function are air- and sensor temperatures. Velocity calibration is only necessary at one air temperature because temperature dependencies on conductivity and viscosity are incorporated in the calibration function.

流体温度的变化是热线风速计测量中最重要的误差源，有时必须加以补偿。尽管多年来已经提出了许多温度补偿方案，但似乎在校正方法上尚未达成共识。在本文中，有关加热丝传热的新的精确测量结果已确认，只要在空气和传感器温度之间的平均温度下评估流体特性，则努塞尔数是雷诺数的一致函数，而无需任何进一步校正。基于此知识，提出了一种新的校准函数，该函数考虑了流体属性中的温度依赖性。目的是提出在实际风速测量中有用的校准功能。该功能中唯一的参数是空气温度和传感器温度。仅在一个空气温度下才需要进行速度校准，因为温度对电导率和粘度的依赖性已包含在校准功能中。