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Siliang’s research team of the Nanjing University of Aeronautics and Astronautics carried out the research on Fan-wing UAV, which was the implementation team of the major exploration project of demonstration and verification of the Fan-wing aircraft in China. It was also revealed that most of the energy for maintaining lift force of the Fan-wing comes from the low-pressure vortices formed inside the crossflow fan. It was proved that the geometric design parameters of the Fan-wing airfoil and crossflow fan blade have a great influence on the lift coefficient, thrust coefficient, and power load characteristics. They have carried out experimental and numerical simulation analysis on the aerodynamic characteristics of the Fan-wing. Several experimental programs have been carried out to demonstrate the Fan-wing concept, including the works of Kogler, Peebles, Seyfang, Foreshaw, Bayindir and Guillermo, Askari et al. Recently, the investigations on the Fan-wing technology integrated into airfoils showed the high lift potential of the embedded propulsion system and moved the research from experimentation to prototyping. The advantages of Fan-wing aircraft compared to the conventional aircraft are short take-off and landing (STOL) at the low forward speed, no stall, and high power load. This kind of distributed lift and thrust of Fan-wing has higher efficiency than that gained by improving the bypass ratio of the gas turbine engine currently. Therefore, Fan-wing accelerates a large volume of air and produces lift and thrust simultaneously. The crossflow fan pulls the air in from the front and accelerates the air over the trailing edge of the wing. There is a crossflow fan with infinitely variable speed powered by the engine at the leading edge of each wing. Introductionįan-wing concept with distributed propulsion is described as a simple, stable, and very efficient high lift aircraft wing. The results show that by controlling the angle of the leading edge winglet, not only the lift and thrust of the fan can be improved but also the strength and position of the low-pressure vortices can be controlled, so as to meet the active control requirements of the aerodynamic moment of the Fan-wing, and then the attitude of the Fan-wing aircraft can be controlled. Through numerical simulation, the effects of single, double, and triple leading edge winglets on lift and thrust of the Fan-wing at different installation angles, inflow velocities, and angles of attack were compared and analyzed.
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Therefore, the method of installing leading edge winglets on the leading edge of a base Fan-wing airfoil was considered to change the opening angle of the leading edge of the Fan-wing. Normally, the geometric parameters of the Fan-wing airfoil were determined the leading edge opening angle has the greatest influence on the aerodynamic performance.
Airfoil fan how to#
How to decouple and control the lift and thrust is the key to further engineering application of the Fan-wing. The turbulent kinetic energy distribution on the leading edge of blades shows that the axial fan with CLARK-Y(C=11.7%) airfoil blades fan can improve the turbulent kinetic energy effectively.The generation of lift and thrust mainly depends on the formation of low-pressure vortices above the arc groove on the leading edge of the Fan-wing, which makes the lift and thrust have a strong coupling relationship. Moreover, the blades loading of the CLARK-Y(C=11.7%) airfoil blades fan is entirely more uniform than that in others. While achieving the highest efficiency in all the operating conditions except the lowest flow rate. The total pressure of the axial fan with CLARK-Y(C=11.7%) blades is highest among others. The results show that the curve of total pressure of the fan with LS airfoil blades is slightly steeper, and that of the fan with CLARK-Y(C=11.7%) (C is the blade thickness ratio) airfoil blades is relatively flat. The 3D internal flows of the axial fan under different operating conditions were simulated based on a steady numerical method in ANSYS CFX 14.5. Four kinds of airfoils have been applied to optimize the impeller of axial fan. In order to study performance of axial fan. Airfoil has great influence on the performance of axial fan.