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Error of a Standard Procedure for Measuring Airflow Velocity in Low-Subsonic-Speed Wind Tunnels by S. Yu. Khizhnyak; O. V. Dovydenko; A. I. Samoylenko is a Engineering article available to read on EtoBox.

What is Error of a Standard Procedure for Measuring Airflow Velocity in Low-Subsonic-Speed Wind Tunnels about?

A standard procedure for measuring airfl ow velocity has been developed in order to unify and standardize applied measuring instruments and data processing algorithms, as well as to reduce the time required for the development and certifi cation of such standard procedures. The study examines the sources of error in indirect airfl ow velocity measurements within the range of 3-105 m/s. The following sources of instrumental error in indirect measurement are analyzed: digital and analog pressure sensors, pitot-static tubes, temperature and relative humidity sensors, and atmospheric pressure sensors. The greatest contribution to the instrumental error is shown to be made by the measurement of pressure diff erence and atmospheric pressure. The procedural error, which depends on the adopted measurement model, is considered. The authors propose a mathematical measurement model including the optimal expressions for determining the density of humid air and corrections for compressibility, which allows the procedural error to be reduced. In addition, requirements are developed for the metrological characteristics of the used measuring instruments, ensuring that the combined error of indirec

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Author

S. Yu. Khizhnyak; O. V. Dovydenko; A. I. Samoylenko

Publisher

Springer Science and Business Media LLC

Published

2023

Language

EN

Field

Engineering (Physical Sciences)