TY - JOUR
T1 - Dynamic lift characteristics of nonslender delta wing in large-amplitude-pitching
AU - Yi, Yuan
AU - Hu, Tianxiang
AU - Liu, Peiqing
AU - Qu, Qiulin
AU - Eitelberg, Georg
AU - Akkermans, Rinie A.D.
PY - 2020/10
Y1 - 2020/10
N2 - The unsteady aerodynamic characteristics of a 50° sweep delta wing performing pitching oscillations at angle of attack between 0° and 60° were tested in a water channel facility. Both force and velocity measurement results were analyzed and compared with the numerical simulation results for the pitching reduced frequency of 0.069 and 0.55. Both lift hysteresis and an unsteady phenomenon of leading-edge vortex (LEV) evolution were observed, which were significantly influenced by the pitch rate of the wing. As the wing pitch rate became sufficiently high, instead of being dissipated and convecting downstream, the LEV remained over the suction surface of the wing, which provide additional lift overshoot at a high angle of attack. In addition, as the wing pitched downstroke due to the negative induced camber effect, the lower surface of the wing turned from a pressure surface to a suction one and hence, there were significant lift losses.
AB - The unsteady aerodynamic characteristics of a 50° sweep delta wing performing pitching oscillations at angle of attack between 0° and 60° were tested in a water channel facility. Both force and velocity measurement results were analyzed and compared with the numerical simulation results for the pitching reduced frequency of 0.069 and 0.55. Both lift hysteresis and an unsteady phenomenon of leading-edge vortex (LEV) evolution were observed, which were significantly influenced by the pitch rate of the wing. As the wing pitch rate became sufficiently high, instead of being dissipated and convecting downstream, the LEV remained over the suction surface of the wing, which provide additional lift overshoot at a high angle of attack. In addition, as the wing pitched downstroke due to the negative induced camber effect, the lower surface of the wing turned from a pressure surface to a suction one and hence, there were significant lift losses.
KW - Hysteresis
KW - Nonslender delta wing
KW - Pitching oscillations
KW - Unsteady aerodynamics
UR - http://www.scopus.com/inward/record.url?scp=85086800466&partnerID=8YFLogxK
U2 - 10.1016/j.ast.2020.105937
DO - 10.1016/j.ast.2020.105937
M3 - Article
AN - SCOPUS:85086800466
SN - 1270-9638
VL - 105
JO - Aerospace Science and Technology
JF - Aerospace Science and Technology
M1 - 105937
ER -