Numerical investigation on aerodynamic performance of a bionic flapping wing

doi:10.1007/s10483-019-2532-8

Applied Mathematics and Mechanics (English Edition) ›› 2019, Vol. 40 ›› Issue (11): 1625-1646.doi: https://doi.org/10.1007/s10483-019-2532-8

Numerical investigation on aerodynamic performance of a bionic flapping wing

Xinghua CHANG¹, Laiping ZHANG¹, Rong MA², Nianhua WANG²

1. State Key Laboratory of Aerodynamics, China Aerodynamics Research and Development Center, Mianyang 621000, Sichuan Province, China;
2. Computational Aerodynamics Institute, China Aerodynamics Research and Development Center, Mianyang 621000, Sichuan Province, China

收稿日期:2019-01-23 修回日期:2019-06-06 出版日期:2019-11-01 发布日期:2019-10-28
通讯作者: Laiping ZHANG E-mail:zhanglp_cardc@126.com
基金资助:
Project supported by the National Key Research and Development Program (No. 2016YFB0200700) and the National Natural Science Foundation of China (Nos. 11532016 and 11672324)

Numerical investigation on aerodynamic performance of a bionic flapping wing

Xinghua CHANG¹, Laiping ZHANG¹, Rong MA², Nianhua WANG²

1. State Key Laboratory of Aerodynamics, China Aerodynamics Research and Development Center, Mianyang 621000, Sichuan Province, China;
2. Computational Aerodynamics Institute, China Aerodynamics Research and Development Center, Mianyang 621000, Sichuan Province, China

Received:2019-01-23 Revised:2019-06-06 Online:2019-11-01 Published:2019-10-28
Contact: Laiping ZHANG E-mail:zhanglp_cardc@126.com
Supported by:
Project supported by the National Key Research and Development Program (No. 2016YFB0200700) and the National Natural Science Foundation of China (Nos. 11532016 and 11672324)

摘要/Abstract

摘要： This paper numerically studies the aerodynamic performance of a bird-like bionic flapping wing. The geometry and kinematics are designed based on a seagull wing, in which flapping, folding, swaying, and twisting are considered. An in-house unsteady flow solver based on hybrid moving grids is adopted for unsteady flow simulations. We focus on two main issues in this study, i.e., the influence of the proportion of down-stroke and the effect of span-wise twisting. Numerical results show that the proportion of downstroke is closely related to the efficiency of the flapping process. The preferable proportion is about 0.7 by using the present geometry and kinematic model, which is very close to the observed data. Another finding is that the drag and the power consumption can be greatly reduced by the proper span-wise twisting. Two cases with different reduced frequencies are simulated and compared with each other. The numerical results show that the power consumption reduces by more than 20%, and the drag coefficient reduces by more than 60% through a proper twisting motion for both cases. The flow mechanism is mainly due to controlling of unsteady flow separation by adjusting the local effective angle of attack. These conclusions will be helpful for the high-performance micro air vehicle (MAV) design.

关键词: flapping wing, bird-like flapping, unsteady flow, radial basis function (RBF), hybrid dynamic mesh, span-wise twisting mechanism

Abstract: This paper numerically studies the aerodynamic performance of a bird-like bionic flapping wing. The geometry and kinematics are designed based on a seagull wing, in which flapping, folding, swaying, and twisting are considered. An in-house unsteady flow solver based on hybrid moving grids is adopted for unsteady flow simulations. We focus on two main issues in this study, i.e., the influence of the proportion of down-stroke and the effect of span-wise twisting. Numerical results show that the proportion of downstroke is closely related to the efficiency of the flapping process. The preferable proportion is about 0.7 by using the present geometry and kinematic model, which is very close to the observed data. Another finding is that the drag and the power consumption can be greatly reduced by the proper span-wise twisting. Two cases with different reduced frequencies are simulated and compared with each other. The numerical results show that the power consumption reduces by more than 20%, and the drag coefficient reduces by more than 60% through a proper twisting motion for both cases. The flow mechanism is mainly due to controlling of unsteady flow separation by adjusting the local effective angle of attack. These conclusions will be helpful for the high-performance micro air vehicle (MAV) design.

Key words: flapping wing, bird-like flapping, unsteady flow, radial basis function (RBF), hybrid dynamic mesh, span-wise twisting mechanism

中图分类号:

Xinghua CHANG, Laiping ZHANG, Rong MA, Nianhua WANG. Numerical investigation on aerodynamic performance of a bionic flapping wing[J]. Applied Mathematics and Mechanics (English Edition), 2019, 40(11): 1625-1646.

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Numerical investigation on aerodynamic performance of a bionic flapping wing

Numerical investigation on aerodynamic performance of a bionic flapping wing

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