caa a22 4500 606197494 CHVBK 20210128100929.0 cr unu---uuuuu 210128e20150901xx s 000 0 eng 10.1007/s00348-015-2048-x doi (NATIONALLICENCE)springer-10.1007/s00348-015-2048-x An experimental study on chaotic oscillation of a chined forebody configuration in roll [Elektronische Daten] [Wei Shi, Xueying Deng, Yankui Wang, Qian Li, Wei Tian] The chaotic oscillation is an aperiodic oscillation rolling between a positive and a negative equilibrium positions with a chaotic behavior. This oscillation pattern was investigated over a chined forebody configuration through a series of wind tunnel tests at an angle of attack of 40° with a Reynolds number of 1.87×105. The wing vortex flow around zero roll angle induced by the forebody asymmetric vortices flow is crucial to the motion. Under static conditions, the strong leeward wing vortex causes the unstable lateral stability around zero roll angle and leads to the formation of a positive and a negative stable equilibrium position of the rolling moment, which is considered as the premise of forming the motion. The strong leeward wing vortex at a low angular velocity can stop the model from crossing zero roll angle and drive the model to increase amplitude, which is the key to explain the flow mechanism. Weakening of the leeward wing vortex due to a prominent hysteresis at a high angular velocity make the model cross zero roll angle, but the appearance of the strong windward vortex after crossing zero roll angle decelerates the rolling motion and makes the amplitude decrease. Springer-Verlag Berlin Heidelberg, 2015 Shi Wei Ministry-of-Education Key Laboratory of Fluid Mechanics, BeiHang University, No.37 Xueyuan Road, Haidian District, 100191, Beijing, China aut Deng Xueying Ministry-of-Education Key Laboratory of Fluid Mechanics, BeiHang University, No.37 Xueyuan Road, Haidian District, 100191, Beijing, China aut Wang Yankui Ministry-of-Education Key Laboratory of Fluid Mechanics, BeiHang University, No.37 Xueyuan Road, Haidian District, 100191, Beijing, China aut Li Qian Ministry-of-Education Key Laboratory of Fluid Mechanics, BeiHang University, No.37 Xueyuan Road, Haidian District, 100191, Beijing, China aut Tian Wei Ministry-of-Education Key Laboratory of Fluid Mechanics, BeiHang University, No.37 Xueyuan Road, Haidian District, 100191, Beijing, China aut Experiments in Fluids Springer Berlin Heidelberg 56/9(2015-09-01), 1-15 0723-4864 56:9<1 2015 56 348 https://doi.org/10.1007/s00348-015-2048-x text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00348-015-2048-x text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Shi Wei Ministry-of-Education Key Laboratory of Fluid Mechanics, BeiHang University, No.37 Xueyuan Road, Haidian District, 100191, Beijing, China aut NATIONALLICENCE 700 1- Deng Xueying Ministry-of-Education Key Laboratory of Fluid Mechanics, BeiHang University, No.37 Xueyuan Road, Haidian District, 100191, Beijing, China aut NATIONALLICENCE 700 1- Wang Yankui Ministry-of-Education Key Laboratory of Fluid Mechanics, BeiHang University, No.37 Xueyuan Road, Haidian District, 100191, Beijing, China aut NATIONALLICENCE 700 1- Li Qian Ministry-of-Education Key Laboratory of Fluid Mechanics, BeiHang University, No.37 Xueyuan Road, Haidian District, 100191, Beijing, China aut NATIONALLICENCE 700 1- Tian Wei Ministry-of-Education Key Laboratory of Fluid Mechanics, BeiHang University, No.37 Xueyuan Road, Haidian District, 100191, Beijing, China aut NATIONALLICENCE 773 0- Experiments in Fluids Springer Berlin Heidelberg 56/9(2015-09-01), 1-15 0723-4864 56:9<1 2015 56 348