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Wang Fangjian, Wang Hongwei, Li Xiaohui, Dong Lei, Huang Zhan, Chen Lan. Subsonic unsteady aerodynamic characteristics on slender revolutionary body at extra-wide angle-of-attack. Chinese Journal of Theoretical and Applied Mechanics, 2022, 54(2): 1-17 doi: 10.6052/0459-1879-21-415
Citation: Wang Fangjian, Wang Hongwei, Li Xiaohui, Dong Lei, Huang Zhan, Chen Lan. Subsonic unsteady aerodynamic characteristics on slender revolutionary body at extra-wide angle-of-attack. Chinese Journal of Theoretical and Applied Mechanics, 2022, 54(2): 1-17 doi: 10.6052/0459-1879-21-415


doi: 10.6052/0459-1879-21-415
  • Received Date: 2021-08-22
  • Accepted Date: 2021-12-10
  • Available Online: 2021-12-11
  • As the main means of attack in modern air combat, air-to-air missile requires higher maneuverability and agility than target aircraft. What’s more, in the face of the new generation of aircraft, the new air-to-air missile must possess all-round attack capability, especially to the threat from the rear target. Therefore, advanced and efficient maneuver methods such as higher turning rate and larger maneuver envelope are needed. In order to ensure the successful completion of efficient maneuvering, the new advanced air-to-air missile is required to have flight and maneuvering control capability within the range of extra-wide angle-of-attack (α = 0° ~ 180°). In the past, most of the observation and research on unsteady flow with extra-wide large angle-of-attack were concentrated in the range α = 40° ~ 60°, and the maximum angle-of-attack was less than 90°. In this paper, numerical simulation (delayed detached eddy simulation, DDES) and wind tunnel test in FD-12 (oil-flow visualization experiment) are used to study the transient flow characteristics and unsteady characteristics in Mach number 0.6 at the angle-of-attack of α = 0° ~ 180° of the slender revolutionary body. At the angle-of-attack of α = 0° ~ 90°, the flow on the leeward side of the slender revolutionary body is mainly dominated by concentrated vortices caused by cylindrical segments, which are characterized by asymmetric vortice, unsteady vortice and vortex shedding. At the angle-of-attack of α = 90° ~ 180°, the bottom of the slender revolutionary body is forward, which leads to a large separation area, and many small-scale eddy interaction in the separation area. As the flow gradually develops backward along the axial direction, the leeward flow is gradually dominated by asymmetric vortex flow. The frequency St number of surface fluctuating pressure induced by asymmetric vortices ranges from 0.19 to 0.33, and the frequency St number of surface fluctuating pressure induced by bottom separation region ranges from 1.55 to 1.64.


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