TY - GEN
T1 - A high-speed high-efficiency vtol vehicle using coflow jet flow control
AU - Boling, Jeremy
AU - Ren, Yan
AU - Zha, Ge Cheng
AU - Zeune, Cale
N1 - Funding Information:
The simulations are conducted on Pegasus supercomputing system at the Center for Computational Sciences at the University of Miami. The work is partially supported by the 2019 AFOSR Summer Faculty Fellowship Program. The Dean’s Fellowship for graduate students and the teaching assistantship from the University of Miami are appreciated.
Funding Information:
The simulations are conducted on Pegasus supercomputing system at the Center for Computational Sciences at the University of Miami. The work is partially supported by the 2019 AFOSR Summer Faculty Fellowship Program. The Dean?s Fellowship for graduate students and the teaching assistantship from the University of Miami are appreciated. This paper has been reviewed and cleared for public release by the United States Air Force (Case Number: 88ABW-2020-1573).
Publisher Copyright:
© 2020, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.
PY - 2020
Y1 - 2020
N2 - This paper conducts a conceptual aerodynamic design and trade study of a CoFlow Jet(CFJ) VTOL (CFJ-VTOL) air vehicle with high speed cruise Mach number of 0.6. The in house high order accuracy FASIP CFD code is used to conduct the full aircraft 3D simulation and wing design trade studies. The vehicle has a tandem wing tailless configuration with the fuselage designed for 1.5 ton payload or 15 passenger seats. The overall aspect ratio of the tandem wing system is 11.65. The CFJ-VTOL concept has both the propeller and wing generating lift at hovering condition to reduce the required power. At cruise, the CFJ is able to enhance the aerodynamic and productivity efficiency due to increased lift and reduced drag at low energy expenditure. A 2D airfoil study is conducted and selects the NACA6415 based CFJ airfoil to form the 3D unswept and untapered wing. A trade study is conducted to configure the tandem wing system, which positions the large wing in the front and the smaller wing with 50% smaller area aft. Such a tandem wings configuration minimizes the front wing tip vortices and downwash interference to the rear wing. At cruise, a very good aerodynamic efficiency (CL/CD)c of 14.6 is achieved with a lift coefficient of 0.812. At hovering static condition, the CFJ wing is positioned at an angle of attack of 80◦ that keeps the flow attached and generates high lift making use of the flow pulled by the propeller. The CFJ wings generate 19% of the total lift, but consume only 1.5% of the total hovering power. This substantially reduces the disk loading and potentially its associated noise. As a result, the system hovering power is decreased by 21.7%, which reduces the propulsion system weight and benefit the whole mission efficiency. The conceptual aerodynamic design and trade study with high fidelity CFD simulation indicates that the CFJ-VTOL concept is not just feasible to cruise at Mach number 0.6 and higher in transonic regime, it is also possible to increase the mission productivity efficiency substantially (e.g. by 100% or higher) compared to the State of the Art conventional VTOL aircraft.
AB - This paper conducts a conceptual aerodynamic design and trade study of a CoFlow Jet(CFJ) VTOL (CFJ-VTOL) air vehicle with high speed cruise Mach number of 0.6. The in house high order accuracy FASIP CFD code is used to conduct the full aircraft 3D simulation and wing design trade studies. The vehicle has a tandem wing tailless configuration with the fuselage designed for 1.5 ton payload or 15 passenger seats. The overall aspect ratio of the tandem wing system is 11.65. The CFJ-VTOL concept has both the propeller and wing generating lift at hovering condition to reduce the required power. At cruise, the CFJ is able to enhance the aerodynamic and productivity efficiency due to increased lift and reduced drag at low energy expenditure. A 2D airfoil study is conducted and selects the NACA6415 based CFJ airfoil to form the 3D unswept and untapered wing. A trade study is conducted to configure the tandem wing system, which positions the large wing in the front and the smaller wing with 50% smaller area aft. Such a tandem wings configuration minimizes the front wing tip vortices and downwash interference to the rear wing. At cruise, a very good aerodynamic efficiency (CL/CD)c of 14.6 is achieved with a lift coefficient of 0.812. At hovering static condition, the CFJ wing is positioned at an angle of attack of 80◦ that keeps the flow attached and generates high lift making use of the flow pulled by the propeller. The CFJ wings generate 19% of the total lift, but consume only 1.5% of the total hovering power. This substantially reduces the disk loading and potentially its associated noise. As a result, the system hovering power is decreased by 21.7%, which reduces the propulsion system weight and benefit the whole mission efficiency. The conceptual aerodynamic design and trade study with high fidelity CFD simulation indicates that the CFJ-VTOL concept is not just feasible to cruise at Mach number 0.6 and higher in transonic regime, it is also possible to increase the mission productivity efficiency substantially (e.g. by 100% or higher) compared to the State of the Art conventional VTOL aircraft.
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U2 - 10.2514/6.2020-2792
DO - 10.2514/6.2020-2792
M3 - Conference contribution
AN - SCOPUS:85092760525
SN - 9781624105982
T3 - AIAA AVIATION 2020 FORUM
BT - AIAA AVIATION 2020 FORUM
PB - American Institute of Aeronautics and Astronautics Inc, AIAA
T2 - AIAA AVIATION 2020 FORUM
Y2 - 15 June 2020 through 19 June 2020
ER -