| Citation: | HE Meng, ZHANG Liu, JIANG Yubiao, et al. Lift enhancement study for upper surface blowing technology of blended wing-body layout aircraft[J]. Journal of Aerospace Power, 2025, 40（1）：20220882 doi: 10.13224/j.cnki.jasp.20220882
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Considering the scheme of the rectangular nozzle of the engine embedded on the wing of the blended wing-body layout aircraft, a control strategy based on the modification of the engine nozzle was proposed. The flow fields of blended wing-body layout aircraft were simulated numerically based on Reynolds average Navier-Stokes equation. The effects of jet pressure ratio, flap deflection angle, flap leading edge radius, upward deflection flaps and combined flaps on the lift-enhancing effect of blended wing-body layout aircraft were analyzed. The results showed that when the flap deflection angle was 40° and the jet drop pressure ratio was large, the negative pressure peak of the leading edge of the flaps decreased and the jet flow separated prematurely at the leading edge of the flap. Increasing the leading edge radius of the flap could help reduce the centripetal force required for deflection and promote jet adhesion. The design of upward deflection flaps and combined flaps at the engine nozzle weakened the influence of the right vortex and surface cross flow on the jet adhesion, which can promote the adhesion of the jet under large drop pressure ratio and large flap angle. Compared with the unmodified nozzle configuration, the combined flap design can achieve an average net thrust deflection angle of 56.10° and the lift coefficient increased by 0.16 when jet drop pressure ratio was 1.45 and angle of attack was 0°, and the lift coefficient increment was kept stable within the range of the calculated angle of attack.
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