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Abstract
Biomass straw fuel has the advantage of lowcarbon sustainability, and therefore, it has been widely used in recent years in coupled blending combustion with coalfired utility boilers for power generation. At present, the drag force F_{D}, the lift force F_{L,} and the torque T evaluation model are very limited. In this study, within a wide range of Reynolds numbers (10 ≤ Re ≤ 2000) and incident angles (0° ≤ θ ≤ 90°), the computational fluid dynamics open source code OpenFOAMbodyfitted mesh method is used to carry out the direct numerical simulation of the flow characteristics of large cylindrical biomass particles with a high aspect ratio of L/D = 9:1. The results show that (1) the projected area of the cylinder begins to decrease after reaching the maximum at θ = 15°, while the change in the incident angle causes the formation of a smaller recirculation zone on the leeward side of the structure, and the effect of the pressure difference on the drag coefficient (C_{D}) is reduced. (2) The lift coefficient (C_{L}) displays a parabolic symmetric distribution when θ = 45°, and then the distribution becomes asymmetrical when Re > 100. The torque coefficient (C_{T}) exhibits a similar trend. (3) Based on the simulation data and the literature data, new models for C_{D}, C_{L}, and C_{T} for cylinders with L/D = 9:1, 10 ≤ Re ≤ 2000 and 0° ≤ θ ≤ 90° are obtained, and the mean square errors are 2.4 × 10^{−2}, 1.4 × 10^{−2}, and 6.4 × 10^{−2}, respectively. This new model can improve the accuracy and adaptability of the universal model of gassolid dynamics for biomass particles.
Originalsprog  Engelsk 

Artikelnummer  013315 
Tidsskrift  Physics of Fluids 
Vol/bind  36 
Udgave nummer  1 
Antal sider  18 
ISSN  10706631 
DOI  
Status  Udgivet  1 jan. 2024 
Fingeraftryk
Dyk ned i forskningsemnerne om 'Direct numerical simulation of the drag, lift, and torque coefficients of high aspect ratio biomass cylindrical particles'. Sammen danner de et unikt fingeraftryk.Projekter
 1 Igangværende

BEGINS: Biomass energy deployment with greater flexibility, efficiency and safety (IFD, 014300015B)
Yin, C. (PI (principal investigator)), Mandø, M. (Projektdeltager) & Miltersen, A. (Projektkoordinator)
01/04/2021 → 31/12/2024
Projekter: Projekt › Forskning