TY - JOUR
T1 - Adjoint-based unsteady shape optimization to suppress transonic buffet
AU - Chen, Wengang
AU - Gao, Chuanqiang
AU - Zhang, Weiwei
AU - Gong, Yiming
N1 - Publisher Copyright:
© 2022 Elsevier Masson SAS
PY - 2022/8
Y1 - 2022/8
N2 - The traditional aerodynamic shape optimization mainly aims at the enhancement of lift-drag ratio in the steady state. In this study, the onset of transonic buffet is improved by the unsteady aerodynamic shape optimization. To achieve this goal, the variance of lift coefficient in a period is adopted as the optimization objective. In addition, the gradients of the objective function with respect to shape parameters are efficiently calculated by the unsteady discrete adjoint method. The proposed method is verified by two optimization examples of NACA0012 and OAT15A. Not only the onsets of transonic buffet are increased by 0.9∘ and 1.7∘ respectively, but also the aerodynamic performance is improved. According to the shape change of optimization examples, we summarize three airfoil geometric characteristics: the position of maximum thickness of the upper airfoil, the thickness near the leading edge, and the thickness near the trailing edge. The influence of the geometric characteristics on the flow stability has been studied.
AB - The traditional aerodynamic shape optimization mainly aims at the enhancement of lift-drag ratio in the steady state. In this study, the onset of transonic buffet is improved by the unsteady aerodynamic shape optimization. To achieve this goal, the variance of lift coefficient in a period is adopted as the optimization objective. In addition, the gradients of the objective function with respect to shape parameters are efficiently calculated by the unsteady discrete adjoint method. The proposed method is verified by two optimization examples of NACA0012 and OAT15A. Not only the onsets of transonic buffet are increased by 0.9∘ and 1.7∘ respectively, but also the aerodynamic performance is improved. According to the shape change of optimization examples, we summarize three airfoil geometric characteristics: the position of maximum thickness of the upper airfoil, the thickness near the leading edge, and the thickness near the trailing edge. The influence of the geometric characteristics on the flow stability has been studied.
KW - Shape optimization
KW - Transonic buffet
KW - Unsteady adjoint method
UR - http://www.scopus.com/inward/record.url?scp=85131661966&partnerID=8YFLogxK
U2 - 10.1016/j.ast.2022.107668
DO - 10.1016/j.ast.2022.107668
M3 - 文章
AN - SCOPUS:85131661966
SN - 1270-9638
VL - 127
JO - Aerospace Science and Technology
JF - Aerospace Science and Technology
M1 - 107668
ER -