外吹式襟翼动力增升效果评估方法

doi:10.7527/S1000-6893.2016.0272

Abstract

Abstract:

Externally blown flaps are usually adopted to shorten the takeoff and land distance of transport aircrafts, and the method for evaluating the powered high-lift effect of the externally blown flap is one of the most important techniques in the design of transport aircrafts. A method for rapidly evaluating the powered high-lift effect of the externally blown flap is developed by coupling basic aerodynamics with the velocity correction technique. The proposed method takes into consideration the requirements for aerodynamic data in the performance computation of powered high-lift aircrafts, and can overcome disadvantages of classical trust coefficient method, such as low speed, limits of large thrust coefficient computation, low precision in solving unstick speed, and inefficiency of solving the problem of aerodynamic loading at multi-velocity point. The aerodynamic and takeoff performance of a transport aircraft are analyzed and the powered high-lift effects of the externally blown flaps are evaluated to validate the proposed method. The results show that the takeoff running distance can be shortened by 25% by deflecting the flaps rationally. However, with too large deflection angle of powered high-lift flaps, the aircraft drag will increase dramatically to go against shortening the takeoff running distance. The research results would provide some guidance for the design of externally blown flaps.

Key words: externally blown flap, powered high-lift, aerodynamics computation, performance earning evaluation, flap configuration optimization

CLC Number:

ZHANG Shengwei, WANG Wei. Method for evaluating powered high-lift effects of externally blown flap[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2017, 38(6): 220689-220689.

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Method for evaluating powered high-lift effects of externally blown flap

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