热线风速仪低温测速的初步研究

EXPLORATION OF MEASURING VELOCITY WITH CONSTANT TEMPERATURE ANEMOMETER SYSTEM UNDER LOW TEMPERATURE CONDITION

由于测量低温下的速度需要热线探针在低温下的响应曲线，所以，获得低温下的热 线探针的准确的响应曲线，便成为在低温下热线测速的基本前提。介绍了热线风速仪的标定 原理与标定公式的修正，重点突出了热线风速仪在低温环境下的密封系统内的速度测量。概 述了一套用于热线低温标定的实验装置，并给出了部分实验结果。

The calibration principle of Constant Temperature Anemoneter(CTA) and the amending of the calibration formula are introduced. The measuring velocity in a sealed system in the low temperature environment is emphasized. In order to get the velocity in the low temperature environment,the response curve of the C TA probe is required, so acquiring the exact response curve becomes the base of measuring velocity with CTA in the low temperature environment. A set of experim ent systems is introduced and some results are given.