吉林大学学报(工学版) ›› 2014, Vol. 44 ›› Issue (2): 387-391.doi: 10.13229/j.cnki.jdxbgxb201402017

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High-lift effect of bionic slat

GE Chang-jiang1, GE Mei-chen2, LIANG Ping1, ZHANG Zhi-hui1, REN Lu-quan1   

  1. 1. Key Laboratory of Bionic Engineering of Ministry of Education, Jilin University, Changchun 130022, China;
    2. College of Mechanical Science and Engineering, Jilin University, Changchun 130022, China
  • Received:2013-03-15 Online:2014-02-01 Published:2014-02-01

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Abstract:

In this paper, a bionic airfoil mimicking the wing of a long-eared owl is proposed. On this basis, a bionic slat without cove and multi-element airfoil is built. In order to reveal high-lift effect of the bionic slat, the corresponding quasi-two-dimensional models are manufactured by rapid manufacturing and prototyping system. Experiments are conducted in a low-turbulence wind tunnel. The results show that the lift coefficient of the bionic airfoil is larger when the angle of attack is less than 5°, but lift coefficient of the bionic multi-element airfoil with slat is larger s when the angle of attack is greater than 5°. The bionic slat can increase the stall angle and the maximum lift coefficient; at the same time, it can also delay the decline of the lift coefficient curve slope in order to prevent the leading-edge separation within a certain range of angle of attack. Furthermore, the flow field around the models is visualized by smoke wire method, which shows the leading-edge separation of the bionic airfoil at low Reynolds numbers. However, the finding does not occur in the flow field of the bionic multi-element airfoil at the same conditions. This superiority may be used as reference in the design of the leading-edge slat or slot.

Key words: engineering bionics, alula, bionic slat, wind tunnel, high-lift effect

CLC Number: 

  • TB17

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