尽管速度测量仪器得到了广泛的应用和使用，但关于气流场中密度变化对旋转叶片风速仪（RVA）、偏转叶片风速仪（DVA）和热线或热探头热风速仪（TA）等常用仪器的速度测量的影响，现有数据不足。流场中的密度变化可能会显著影响这些风速计的输出。ASHRAE研究项目698理论阶段的报告，旨在开发校正因子以减少此类测量误差。对于叶片风速计和热风速计，理论预测了速度随流场温度、压力、湿度和/或密度的变化。结果表明，温度和压力对仪器输出有显著影响。 对于叶片风速计，流场中流体条件的整体校正可基于密度校正系数。然而，必须注意，温度和湿度对叶片风速计的润滑剂和轴承的二次影响可能会影响仪器的输出。对于热风速计，流体的其他适用热物理性质（即粘度、导热系数和比热）排除了仅基于密度的校正系数。关键词:计算、温度、湿度、测量、风速计、速度、密度、空气流量、热线风速计、润滑剂、粘度、导热系数、比热引用:ASHRAE Trans。1994年，第100卷，第1部分，论文编号3763（RP-698），274-291，15图。，参考文献。，bibl。

Despite the widespread application and use of velocity-measuring instruments, there are insufficient data available on the influence of density variation in an air flow field on velocity measurements by common instruments such as the rotating vane anemometer (RVA), the deflecting vane anemometer (DVA), and the hot-wire or heated-probe thermal anemometer (TA). Density variations in the flow field may significantly affect the output of these anemometers. Reports on the theoretical phase of ASHRAE Research Project 698, aimed at developing correction factors to reduce such measurement errors. Theoretical predictions of velocity variations as a function of flow-field temperature, pressure, humidity, and/or density have been developed for both vane and thermal anemometers. Results indicate significant effects of temperature and pressure on instrument output. In the case of the vane anemometer, an overall correction for fluid conditions in the flow field may be based on a density correction factor. However, it must be noted that secondary effects of temperature and humidity on the lubricants and bearings of a vane anemometer may affect the output of the instrument. For the thermal anemometer, other applicable thermophysical properties of the fluid (i.e., viscosity, thermal conductivity, and specific heat) rule out a correction factor based on density alone.KEYWORDS: calculating, temperature, humidity, measuring, anemometers, speed, density, air flow, hot wire anemometers, lubricants, viscosity, thermal conductivity, specific heat