Wind tunnel measurements of dynamic aerodynamic coefficients using a freely rotating test bench
International Journal of Numerical Methods for Heat & Fluid Flow
ISSN: 0961-5539
Article publication date: 17 April 2023
Issue publication date: 24 April 2023
Abstract
Purpose
This paper aims to propose a dedicated measurement methodology able to simultaneously determine the stability derivative Cmα and the pitch damping coefficient sum Cmq + Cmα in a wind tunnel using a single and almost non-intrusive metrological setup called MiRo.
Design/methodology/approach
To assess the MiRo method’s reliability, repeatability and accuracy, the measurements obtained with this technique are compared to other sources like aerodynamic balance measurements, alternative wind tunnel measurements, Ludwieg tube measurements, free-flight measurements and computational fluid dynamics (CFD) simulations. Two different numerical approaches are compared and used to validate the MiRo method. The first numerical method forces the projectile to describe a pure oscillation motion with small amplitude along the pitch axis during a rectilinear flight, whereas the second numerical approach couples the one degrees of freedom simulation motion equations with CFD methods.
Findings
MiRo, a novel and almost non-intrusive technique for dynamic wind tunnel measurements, has been validated by comparison with five other experimental and numerical methodologies. Despite two completely different approaches, both numerical methods give almost identical results and show that the holding system has nearly no impact on the dynamic aerodynamic coefficients. Therefore, it could be assessed that the attitude of MiRo model in the wind tunnel is very close to the free-flight one.
Originality/value
The MiRo method allows studying the attitude of a projectile in a wind tunnel with the least possible impact on the flow around a model.
Keywords
Acknowledgements
Erratum: It has come to the attention of the publisher that the article “Wind tunnel measurements of dynamic aerodynamic coefficients using a freely rotating test bench” by Laurène Muller, Michel Libsig, Yannick Bailly and Jean-Claude Roy, published in International Journal of Numerical Methods for Heat & Fluid Flow, Vol. 33, No. 4, https://doi.org/10.1108/HFF-09-2022-0548, contained mathematical errors introduced during the typesetting process. The publisher sincerely apologises for these errors and for any misunderstanding. Following errors have now been corrected online:
Corrigendum: It has come to the attention of the publisher that the article “Wind tunnel measurements of dynamic aerodynamic coefficients using a freely rotating test bench” by Laurène Muller, Michel Libsig, Yannick Bailly and Jean-Claude Roy, published in International Journal of Numerical Methods for Heat & Fluid Flow, Vol. 33, No. 4, https://doi.org/10.1108/HFF-09-2022-0548, contained mathematical errors introduced during the submission process. The publisher sincerely apologises for these errors and for any misunderstanding. Following error has now been corrected online:
The authors would like to thank all those who invested their time and resources in the development of the MiRo measurement technique and contributed to prepare and conduct the experiments. A special mention goes to the staff of the ISL’s main workshop, the wind tunnel testing team, the shock tunnel testing team and the free flight testing team.
Citation
Muller, L., Libsig, M., Bailly, Y. and Roy, J.-C. (2023), "Wind tunnel measurements of dynamic aerodynamic coefficients using a freely rotating test bench", International Journal of Numerical Methods for Heat & Fluid Flow, Vol. 33 No. 4, pp. 1562-1583. https://doi.org/10.1108/HFF-09-2022-0548
Publisher
:Emerald Publishing Limited
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