| Citation: | WANG Y T，LAN Q S，ZHOU Z，et al. Design and aerodynamic analysis of blended wing body with variable camber technology[J]. Journal of Beijing University of Aeronautics and Astronautics，2024，50（4）：1292-1307 （in Chinese） doi: 10.13700/j.bh.1001-5965.2022.0493
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The variable camber wing has great potential to improve the aerodynamic characteristics of conventional tube and wing design, but it can change the pitching moment of the whole aircraft. The drag reduction advantage and trim penalty of variable camber technology on a blended wing-body aircraft are explored, taking into account the features of short moment arm and substantial trim loss in the blended wing body. Considering the engineering practice, the variable camber of the trailing edge is realized based on flap deflection, and the trimming ability of the flap at different spanwise positions is compared and analyzed. Then, the global optimization method is used to carry out the optimization design of variable camber aerodynamic drag reduction; finally, the variable camber design space is explored. The results show that as the lift coefficient changes, the position of the flap that produces the least trim resistance also changes. Without the pitching moment trim constraint, at most 4.62% of the drag reduction benefit can be obtained by using the variable camber technology. When compared to trimming with the center body's trailing edge, variable camber technology can result in a trim loss of 2.4×10−4 when it comes to the pitching moment trim constraint.Under different lift coefficients, there are obvious differences in the deflection combination of flaps with variable camber. When the lift coefficient is small, the variable camber can decrease drag by combining the deflection of multiple flap negative deflections, which will increase the head-up moment. When the lift coefficient is large, however, the variable camber can decrease drag by combining the deflection of multiple flap positive deflections. The evaluation of variable camber drag reduction benefit and moment penalty based on the combined deflection of flaps can provide a reference for the engineering design of variable camber blended wing body aircraft.
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