Abstract
Small-scale ducted fans can be used to generate the necessary force and moment for propulsion in many applications. In the present work, the aerodynamic performance of a ducted fans system (DFS), which consists two distinct counter-rotating ducted fans, is analyzed numerically by considering the influence of different geometrical parameters that include rotational speed, eccentricity, and the distance between the two fans. The results reveal that the force and moment in the axial direction are orders of magnitude higher than those in the other two directions under typical conditions. The aerodynamic performance of the DFS shows only minor vibrations for dimensionless rotational speed N below 1 which corresponds to the critical physical rotational speed of 2.104 rpm. Moreover, the force and moment increase dramatically for higher N, following the typical relationship between rotational speed and force for rotor systems. The eccentricity contributes to significant increase in magnitudes on both force and moment in all three directions, whereas the distance between the twin fans exhibits little impact. The numerical simulations suggest that the exploitation of eccentricity is the most efficient approach to control the total output of force and moment of the DFS within the investigated range of geometrical parameters.
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Stevens, R.J.A.M.; Martinez-Tossas, L.A.; Meneveau, C.: Comparison of wind farm large eddy simulations using actuator disk and actuator line models with wind tunnel experiments. Renew. Energy 116, 470–478 (2018)
Porte-Agel, F.; Wu, Y.T.; Chen, C.H.: A numerical study of the effects of wind direction on turbine wakes and power losses in a large wind farm. Energies 6(10), 5297–5313 (2013)
Yang, Y.; Veldhuis, L.L.M.; Eitelberg, G.: Numerical analysis of propeller induced ground vortices by actuator disk model. J. Vis. 21(1), 117–132 (2018)
Behrouzifar, A.; Darbandi, M.: An improved actuator disc model for the numerical prediction of the far-wake region of a horizontal axis wind turbine and its performance. Energy Convers. Manag. 185, 482–495 (2019)
Andrikopoulos, G.; Nikolakopulos, G.: Vortex actuation via electric ducted fans: an experimental study. J. Intell. Rob. Syst. 95, 955–973 (2019)
Lin, S.Y.; Shieh, T.H.: Study of aerodynamical interference for a wind turbine. Int. Commun. Heat Mass Transfer 37(8), 1044–1047 (2010)
Moens, M.; Duponcheel, M.; Winckelnnans, G.; Chatelain, P.: An actuator disk method with tip-loss correction based on local effective upstream velocities. Wind Energy 21(9), 766–782 (2018)
Moghadam, S.M.A.; Meinke, M.; Schroder, W.: Analysis of tip-leakage flow in an axial fan at varying tip-gap sizes and operating conditions. Comput. Fluids 183, 107–129 (2019)
Reese, H.; Kato, C.; Carolus, T.H.: Large eddy simulation of acoustical sources in a low pressure axial-flow fan encountering highly turbulent inflow. J. Fluid Eng.-Trans. ASME 129(3), 263–272 (2007)
Chen, G.Q.; Bai, P.; Zhan, H.L.; Ji, C.Q.: Numerical simulation study on propeller slipstream effect on unmanned air vehicle with propeller engine. Acta Aerodyn. Sin. 33(4), 554–562 (2015)
Chen, J.; Li, L.; Huang, G.; Xiang, X.: Numerical investigations of ducted fan aerodynamic performance with tip-jet. Aerosp. Sci. Technol. 78, 510–521 (2018)
Ohanian, O.J., III.; Karni, E.D.; Inman, D.J.: Ducted-fan force and moment control via steady and synthetic jets. J. Aircr. 48(2), 514–526 (2011)
Kumar, V.; Saha, S.: Theoretical performance estimation of shrouded-twin-rotor wind turbines using the actuator disk theory. Renew. Energy 134, 961–969 (2019)
Muehlebach, M.; D’Andrea, R.: The flying platform-a testbed for ducted fan actuation and control design. Mechatronics 42, 52–68 (2017)
Wang, K.L.; Zhou, Z.; Zhu, X.P.; Xu, X.P.: Aerodynamic design of multi-propeller/wing integration at low Reynolds numbers. Aerosp. Sci. Technol. 84, 1–17 (2019)
Teng, J.; Zhang, J.; An, Z.; You, Y.: Detached eddy investigation of conical cavity flow at Mach 0.9. J. Appl. Fluid Mech. 11(1), 165–176 (2018)
Chen, R.; Wang, X.; You, Y.: Numerical simulation of nacelle’s effects on propeller slipstream based on IDDES model. Acta Aeronautica et Astronautica Sinica 37(06), 1851–1860 (2016)
Radespiel, R.; Turkel, E.; Kroll, N.: Assessment of Preconditioning methods, DLR Forschungsbericht (1995)
Venkatakrishnan, V.: On the accuracy of limiters and convergence to steady state solutions. 31st Aerospace Sciences Meeting, AIAA 93–0880 (1993)
Guo, F.; Gui, F.; You, Y.; Zhu, J.; Zhu, C.: Experimental study of TBCC engine performance in low speed wind tunnel. J. Propuls. Technol. 40(11), 2436–2443 (2019)
Acknowledgements
This study was funded by the Fundamental Research Funds for the Central Universities (No. 20720170055), the Aeronautical Science Foundation of China (No. 2018ZB68008), and the 1912 project. The authors also thank the Chinese Aeronautical Establishment and the China Academy of Aerospace Aerodynamics for the financial support of this work.
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Zhu, C., Hu, Z., Cai, Z. et al. Numerical Investigation on the Influence of Geometrical Parameters on the Aerodynamic Performance of a Small-Scale Ducted Fans System. Arab J Sci Eng 46, 11963–11970 (2021). https://doi.org/10.1007/s13369-021-05799-x
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DOI: https://doi.org/10.1007/s13369-021-05799-x