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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2022, Vol. 43 ›› Issue (11): 526767-526767.doi: 10.7527/S1000-6893.2021.26767

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Gust load alleviation control based on jets for natural laminar airfoil

WANG Haifeng1, DENG Feng1, LIU Xueqiang1, QIN Ning2   

  1. 1. Ministerial Key Discipline Laboratory of Advanced Design Technology of Aircraft, College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;
    2. Department of Mechanical Engineering, University of Sheffield, Sheffield S1 3 JD, United Kingdom
  • Received:2021-12-07 Revised:2021-12-23 Online:2022-11-15 Published:2022-01-18
  • Supported by:
    National Natural Science Foundation of China (11672132, 12032011); Priority Academia Program Development of Jiangsu Higher Education Institutions

Abstract: Gust load alleviation by trailing edge blowing is studied based on CFD numerical simulation for natural laminar airfoil NLF416, involving two sections:open and closed loop control. The effects of the momentum coefficient, time-lag, feedback factor and variable on the control effects are analyzed, and the results indicate the feasibility of gust load reduction by jets, and that the variation of lift response in the gust flow can decrease by about 78.9% with an accurate momentum coefficient. The response variation can be further reduced by 10% in consideration of the time-lag. For the closed-loop control, the feedback based on the gust velocity upstream is better than that based on the lift coefficient. The former can reduce both the lift peak and the response variation by 14.3% compared with the latter, and keep the change in the momentum coefficient similar to the cosine function. The results of feedback based on the gust velocity are close to those of the open-loop control. The control system is applied to the suppression of other continuous gust responses to verify the universality of jet flow control, and the results indicate a significant load reduction.

Key words: gust loads alleviation, jets, CFD, open and closed loop control, laminar airfoil

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