加固型热线及流速测量

Reinforced Hot Wire and Flow Velocity Measurement

提出一种加固型的热线式流速传感器，它由一根较粗的绝缘棒和贴在其上的铂丝组成；并给出了与该结构相适应的新的计算流速经验公式．风洞实验证明，对于加固后的热线流速传感器，新的计算公式比Ｋｉｎｇ氏公式有较高的计算精度．在０～２０ｍ／ｓ的单量程范围内，测量误差从用Ｋｉｎｇ氏公式时的０．６５ｍ／ｓ减小到０．１４ｍ／ｓ．

Reinforced hot wire probes are described.The new probe is a cylincal rod on which a platinum wire is fixed. A new equation Which relates the probe output and flow velocity is presented. Experiments in the wind tunnel show that the new equation resultS in a better measurement than is given by King's law.The measurement error is decreased from 0.65m/s(by King's law) to 0.14m/s in the range of 0-20m/s.