3D printed wind-tunnel for calibrating bidirectional velocity probes in fire engineering

Published: 16 August 2022| Version 1 | DOI: 10.17632/w3jkrw2ct8.1


This is 3D printed wind tunnel with Arduino-based unit. This source describes Open Hardware and is licensed under the CERN-OHL-S v2 Experience with Arduino platform is required and supervision from a qualified electric engineering professional. The project is prototype under development and authors are not responsible for any damages or injuries caused by inappropriate construction or operation. This source is distributed WITHOUT ANY EXPRESS OR IMPLIED WARRANTY, INCLUDING OF MERCHANTABILITY, SATISFACTORY QUALITY AND FITNESS FOR A PARTICULAR PURPOSE. References B.J. McCaffrey, G. Heskestad,A robust bidirectional low-velocity probe for flame and fire application, Combustion and Flame, Volume 26, 1976, Pages 125-127, ISSN 0010-2180, https://doi.org/10.1016/0010-2180(76)90062-6. Mauro, Stefano & Lanzafame, Rosario & Messina, Michele & Brusca, S. & Famoso, Fabio & Galvagno, Antonio. (2017). Small-Scale Open-Circuit Wind Tunnel: Design Criteria, Construction and Calibration. International Journal of Applied Engineering Research. 12. 13649-13662. The JeeLabs Shop. (n.d.). Retrieved February 11, 2021, from https://www.digitalsmarties.net/products/wind-sensor-rev-p Wind sensor REV. p - low Cost Anemometer. (n.d.). Retrieved February 12, 2021, from https://moderndevice.com/product/wind-sensor-rev-p/ How can i tell if a case fan is sucking or blowing air? (2019, December 30). Retrieved February 13, 2021, from https://www.computerhope.com/issues/ch001151.htm Prohasky, Daniel & Watkins, Simon. (2014). Low cost hot-element anemometry versus the TFI Cobra. Thingiverse.com. (n.d.). The ultimate box maker BY HEARTMAN. Retrieved February 12, 2021, from https://www.thingiverse.com/thing:1264391 T H Yong and S S Dol 2015 IOP Conf. Ser.: Mater. Sci. Eng. 78 012039


Steps to reproduce

The current small-scale low-speed wind-tunnel setup consists of three units: the wind-tunnel, the control and the measuring unit connected to the PC which provides appropriate airflow velocity up to 5 m/s. The wind tunnel unit parts are printed using a 3D PRUSA MK3S Printer with a 0.3 mm resolution. PET-G was selected as a material for its superior mechanical properties that include increased durability, strength and ease in further manufacturing e.g., drilling, gluing, cutting, etc. The wind tunnel unit is divided and printed in parts according to the requirements of the 3D printer. After printing, parts are glued and sealed using silicone. The main benefits of the 3D printing of wind-tunnel parts are the ease of construction, assembly and ease of customisation in case of further development. 3D printing is also suitable for more complicated and sophisticated parts, e.g., the diffuser of these wind tunnels that would have been difficult to build under conventional construction techniques. The electronic circuit included components which are easily accessible in local shops or in e-shops. Only part that was difficult to acquire is the velocity sensor Rev.P that can be ordered from the US or UK. The measuring unit is based on Arduino UNO with an LCD 16x2 monochromatic display for visualization of current velocity and Datalogger Shield for storing data on an SD card without connecting to a PC. Arduino is popular in prototyping for its user-friendly application, large community support and large number of tutorials and source codes determining it as the best solution for special application in fire engineering. The Arduino provides the possibility to connect a measuring unit to a PC through a USB port and store data online on the computer Arduino’s Serial Monitor.


Vysoka Skola Banska-Technicka Univerzita Ostrava Fakulta Bezpecnostniho Inzenyrstvi


Fire Dynamics, Velocity, Fire