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

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Measurement Techniques Aims and scope

A standard procedure for measuring airflow 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 certification of such standard procedures. The study examines the sources of error in indirect airflow 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 difference 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 indirect airflow velocity measurements complies with the permissible limits of Δperm = ±0.2 m/s. The authors give recommendations on the use of measuring instruments and algorithms of measurement result processing, which enable a 39% measurement error reduction and the creation of a standard procedure for measuring airflow velocity. This procedure can be used in the aviation industry when measuring airflow velocity via the pneumometric method.

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Notes

  1. GOST OIML R 111-1-2009. GSI. Weights of classes E1, E2, F1, F2, M1, M1–2, M2, M2–3 and M3. Part 1. Metrological and Technical Requirements.

  2. MI 2000-89. GSI. Low-Subsonic-Speed Wind Tunnels. Metrological Certifi cation Procedure.

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Authors and Affiliations

  1. Zhukovsky Central Aerohydrodynamic Institute, Zhukovsky, Moscow Region, Russia

    S. Yu. Khizhnyak, O. V. Dovydenko & A. I. Samoylenko

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  1. S. Yu. Khizhnyak
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  2. O. V. Dovydenko
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  3. A. I. Samoylenko
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Correspondence to S. Yu. Khizhnyak.

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Translated from Izmeritel'naya Tekhnika, No. 1, pp. 8–15, January, 2023.

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Khizhnyak, S.Y., Dovydenko, O.V. & Samoylenko, A.I. Error of a Standard Procedure for Measuring Airflow Velocity in Low-Subsonic-Speed Wind Tunnels. Meas Tech 66, 6–13 (2023). https://doi.org/10.1007/s11018-023-02183-z

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