Study the Influence of Position and the Angle of the Winglets on MITE Micro Air Vehicle

2010 ◽  
Author(s):  
Babak Ganji ◽  
Romina Sadr-Eshkevari
Keyword(s):  
Reynolds Number ◽  
Drag Force ◽  
Lift Force ◽  
Aerodynamic Characteristics ◽  
Flow Solver ◽  
Structured Grid ◽  
Lateral Angle ◽  
Reynolds Number Flow ◽  
Air Vehicle ◽  
Number Flow

In recent years, small aircraft has been thoroughly studied and superior designs have been extensively developed. The aerodynamic design of micro aerial vehicles (MAVs), the most important small aircrafts, in Low-Reynolds number flow (LRNF) has become one of the main concerns to the profession. LRNF is mostly influenced by the airfoil design. Similar to all aircrafts, vertical elevons and winglets play an important role in the aerodynamics of MAVs. On this basis, the present study aimed to assess the effect of lateral angle alterations of the two vertical winglets in the aerodynamics of micro tactical expendable (MITE) in LRNF. A finite element flow solver (FEFS) based on structured grid was employed for studying the aerodynamic characteristics of MITE. The findings of the present study suggest that with the gradual increase in cant angle φ, lift force decreases and drag force remains unchanged. Also with the increase of lateral angle θ, drag force increases significantly and negligible changes are observed in lift force. Vertical elevons play an important role in the control of MITE. Also the effect of Reynolds number on aerodynamic coefficients is discussed.

Drag force of intermediate Reynolds number flow past mono- and bidisperse arrays of spheres

AIChE Journal ◽  
2007 ◽  
Vol 53 (2) ◽  
pp. 489-501 ◽  
Author(s):  
R. Beetstra ◽  
M. A. van der Hoef ◽  
J. A. M. Kuipers
Keyword(s):  
Reynolds Number ◽  
Drag Force ◽  
Reynolds Number Flow ◽  
Flow Past ◽  
Number Flow ◽  
Arrays Of Spheres

Direct numerical simulation of low-Reynolds-number flow past arrays of rotating spheres

2015 ◽  
Vol 765 ◽  
pp. 396-423 ◽  
Author(s):  
Qiang Zhou ◽  
Liang-Shih Fan
Keyword(s):  
Reynolds Number ◽  
Drag Force ◽  
Lift Force ◽  
Immersed Boundary ◽  
Particle Rotation ◽  
Volume Fractions ◽  
Reynolds Number Flow ◽  
Lattice Boltzmann Simulations ◽  
Random Arrays ◽  
Simulation Results

AbstractImmersed boundary-lattice Boltzmann simulations are used to examine the effects of particle rotation, at low particle Reynolds numbers, on flows in ordered and random arrays of mono-disperse spheres. The drag force, the Magnus lift force and the torque on the spheres, are determined at solid volume fractions up to the close-packed limits of the arrays. The rotational Reynolds number based on the angular velocity and the diameter of the spheres is used to characterize the rotational movement of spheres. The results show that the normalized Magnus lift force produced by particle rotation is approximately in direct proportion to the rotational Reynolds number, while the normalized drag force and torque acting on spheres are barely affected by this number. The Magnus lift force is negligible relative to the magnitude of the drag force when the rotational Reynolds number is low. However, it can be very significant, and even larger than the drag force, as the rotational Reynolds number increases up to $O(10^{2})$, especially for low solid volume fractions. Based on the simulation results, relations for the Magnus lift force and the torque for both ordered arrays and random arrays of rotating spheres at solid volume fractions from zero to close-packed limits are formulated. Further, the drag force relations in the literature are revised based on existing theories and the present simulation results for both arrays of spheres.

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