Dynamic lift characteristics of nonslender delta wing in large-amplitude-pitching

Yuan Yi, Tianxiang Hu*, Peiqing Liu, Qiulin Qu, Georg Eitelberg, Rinie A.D. Akkermans

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)


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.

Original languageEnglish
Article number105937
Number of pages14
JournalAerospace Science and Technology
Publication statusPublished - Oct 2020


  • Hysteresis
  • Nonslender delta wing
  • Pitching oscillations
  • Unsteady aerodynamics


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