Abstract
A new control method using jet to control airfoil is proposed through arranged jet on the lower surface of the trailing edge (LSTE jet). Commercial computational fluid dynamics software CFX was utilized to compute the flow field around the airfoil. Through comparing the changes of the flow field before and after the jet was applied, we studied the flow control effects and laws of LSTE jet. We also studied the change rule of lift and drag characteristics with jet position, momentum coefficient and forward angle. Our results showed that, first, LSTE jet caused low-pressure zone at airfoil trailing edge and forced the flow to deflect downward, which increased the effective curvature of the airfoil and so increased the lift. Second, aerodynamic coefficients were sensitive to all of the three parameters of jet position, momentum coefficient and forward angle. LSTE jet closer to the trailing edge caused greater lift and less drag because it created a larger low-pressure area. At small angle of attack, lift coefficient increased as jet momentum coefficient increased and had good linearity. The best forward angle was 70°, at which point the lift was greatest and the drag was least. In general, LSTE jet can effectively influence aerodynamic characteristics of NACA0012 airfoil and had a good application prospect in flow control of aircraft.
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Acknowledgements
This works is supported by the National Natural Science Foundation of China (No.61573286 and No. 61374032) and Shaanxi Province Key Laboratory of Flight Control and Simulation Technology.
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Fu, Y., Shi, J., Huang, D., Zhang, W. (2022). Influence of Continuous Jet at the Lower Surface on Airfoil Aerodynamic Performance. In: Yan, L., Duan, H., Yu, X. (eds) Advances in Guidance, Navigation and Control . Lecture Notes in Electrical Engineering, vol 644. Springer, Singapore. https://doi.org/10.1007/978-981-15-8155-7_147
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DOI: https://doi.org/10.1007/978-981-15-8155-7_147
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