Choosing a Universal Air Collector Design for a Cylindrical-Shaped Hot-Wire Anemometer

DOI https://doi.org/10.15407/pmach2021.02.006
Journal Journal of Mechanical Engineering – Problemy Mashynobuduvannia
Publisher A. Pidhornyi Institute for Mechanical Engineering Problems
National Academy of Science of Ukraine
ISSN  2709-2984 (Print), 2709-2992 (Online)
Issue Vol. 24, no. 2, 2021 (June)
Pages 6-15
Cited by J. of Mech. Eng., 2021, vol. 24, no. 2, pp. 6-15

 

Authors

Oleh S. Tsakanian, A. Pidhornyi Institute of Mechanical Engineering Problems of NASU (2/10, Pozharskyi St., Kharkiv, 61046, Ukraine), e-mail: tsakoleg@rambler.ru, ORCID: 0000-0002-1077-9818

Serhii V. Koshel, A. Pidhornyi Institute of Mechanical Engineering Problems of NASU (2/10, Pozharskyi St., Kharkiv, 61046, Ukraine), e-mail: koshel@nas.gov.ua, ORCID: 0000-0003-3603-0909

 

Abstract

Air flow measurement at the outlets of air terminal devices installed in ventilation systems is very difficult. At the outlets of anemostats, swirl diffusers, grilles,  the air flow can swirl, contract, or expand sharply, change its direction, etc., which causes great measurement errors. Therefore, it was necessary to develop a universal measuring device that would make it possible to measure air flow rate with high accuracy. It should consist of an air collector (for collecting and rectifying air flow) and a sensor for measuring air flow rate (integral hot-wire anemometer). Several air collector designs have been investigated. The parabolic air collector was chosen as the rational one. It has low aerodynamic resistance and good air flow distribution. To reduce the influence of turbulence and air swirling, a cylindrical stilling channel with a built-in rectifying grille is connected to the air collector. Experimental studies on various air distribution devices made it possible to obtain a refined calibration dependence for an integral hot-wire anemometer, the dependence being used to calculate air flow rate. The influence of the aerodynamic resistance of an airflow meter on air flow rate is taken into account with the help of a correction that must be introduced into the values measured.

 

Keywords: air collector, hot-wire anemometer, measurements

 

Full text: Download in PDF

 

References

    1. (2013). Vozdukhoraspredelitelnyye ustroystva [Air distribution devices]: Catalog. VENTS: Official site. Kiyev, 101 p. (in Russian). URL: https://js.com.ua/upload/iblock/311/15_1156_cat_file.pdf.
    2. O’Sullivan, J., Ferrua, M., Love, R., Verboven, P., Nicolaï, B., & East, A. (2014). Airflow measurement techniques for the improvement of forced-air cooling, refrigeration and drying operations. Journal of Food Engineering, vol. 143, pp. 90–101. https://doi.org/10.1016/j.jfoodeng.2014.06.041.
    3. (2012). Professionalnyye izmereniya klimata v pomeshcheniyakh [Professional measurements of indoor climate]. SOK. Santekhnika. Otopleniye. KonditsionirovaniyePlumbing. Heating. Conditioning. Energy Efficiency, no. 4, pp. 64–66 (in Russian).
    4. Ower, E. & Pankhurst, R. C. (2014). The Measurement of Air Flow. United Kingdom, Oxford: Pergamon, 384 p.
    5. Örlü, R. & Vinuesa, R. (2017). Thermal anemometry. Experimental Aerodynamics. CRC Press, pp. 257–304. https://doi.org/10.1201/9781315371733-12.
    6. Ikeya, Y., Örlü, R., Fukagata, K., Alfredsson, P. H. (2017). Towards a theoretical model of heat transfer for hot-wire anemometry close to solid walls. International Journal of Heat and Fluid Flow, vol. 68, pp. 248–256. https://doi.org/10.1016/j.ijheatfluidflow.2017.09.002.
    7. Saremi, S., Alyari, A., Feili, D., & Seidel, H. (2014). A MEMS-based hot-film thermal anemometer with wide dynamic measurement range. Proceedings IEEE Conferences on Sensors (SENSORS’2014). Valencia, Spain, 2–5 November 2014, pp. 420–423. https://doi.org/10.1109/ICSENS.2014.6985024.
    8. Taratyrkin, K. Ye. & Chernoivanov, D. V. (2017). Otsenka tochnosti opredeleniya raskhoda vozdukha v sistemakh ventilyatsii pri ikh pasportizatsii [Assessment of the accuracy of determining the air flow rate in ventilation systems during their certification]. AVOK – ABOK, no. 3, pp. 54–59 (in Russian).
    9. Tsakanyan, O. S. & Koshel, S. V. (2020). Integral thermo-anemometers for average temperature airflow measurement in ducts, at anemostat outlets and in ventilation grilles.  Journal of Mechanical Engineering – Problemy Mashynobuduvannia, vol. 23, no. 4, pp. 14–21. https://doi.org/10.15407/pmach2020.04.014.

 

Received 28 May 2021

Published 30 June 2021