Abstract
The Martian atmosphere is characterized by low density and low temperatures, resulting in Mars vehicles typically operating at low Reynolds numbers compressible flow. To obtain the difference in the prediction of such flows by different computational numerical models. Based on Reynolds-averaged Navier–Stokes (RANS) (including the S-A and SST k-ω turbulence models) and large eddy simulation (LES) models, a three-dimensional flow model of Mars environmental blades is established. And this paper numerically studied the triangular airfoil under compressible flow conditions with a low Reynolds number (Re = 3000, Mach = 0.5), considering various angles of attack (AOA). The results show that LES can predict lift coefficient (Cl) and drag coefficient (Cd) well. S-A turbulence model has high fidelity only at low angles of attack, and it is difficult to accurately predict flow separation at high AOA. A similar situation applies to the SST k-ω turbulence. When the AOA increases from 10 to 11°, the increase of lift coefficient is mainly dominated by the suction surface. Moreover, even at an AOA as low as 3°, flow separation was observed on the airfoil surface in the Martian environment.
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Acknowledgements
This work is supported by the Open Research Fund of State Key Laboratory of Hydro-Power Equipment (No. SKLHE-ORF-202108) and the Fundamental Research Funds for the Central Universities (Grant No. AUGA9803500921).
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Wang, J., Wang, C., Liu, C., Wu, J. (2024). Numerical Analysis of Low Reynolds Number Compressible Flows with Triangle Airfoil. In: Liu, Z., Li, R., He, X., Zhu, Z. (eds) Advances and Challenges in Advanced Unmanned Aerial Systems. ICAUAS 2023. Springer Aerospace Technology. Springer, Singapore. https://doi.org/10.1007/978-981-99-8045-1_9
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DOI: https://doi.org/10.1007/978-981-99-8045-1_9
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