论文部分内容阅读
The patterns of wing rock motion at 52.5°angle of attack have already been investigated in detail(Rong,2009;Wang,2010).These patterns are completely different from those at other angles of attack.This phenomenon indicates that angle of attack affects wing rock motion.The present study aims to examine the different patterns of wing rock motion at different angles of attack.The flow mechanisms of the motion patterns are also revealed,especially the uncommanded lateral motions,including wing rock and lateral deflection,induced by regular asymmetric separated flow from wings at low angles of attack and forebody asymmetric vortices at angles of attack of 27.5°≤α≤70°.The test conditions,including the testing Reynolds number,wind tunnel,experimental techniques,and test model,are all the same as those used in a previous study at α=52.5°.Finally,the experimental technique of rotating nose of the model to suppress the wing rock or lateral deflection,which is induced by forebody asymmetric vortex flow,is applied.The uncommanded lateral motions are successfully suppressed by this technique.
The patterns of wing rock motion at 52.5 ° angle of attack have already been investigated in detail (Rong, 2009; Wang, 2010). These patterns are completely different from those at other angles of attack. This phenomenon indicates that angle of attack affects wing rock motion. present the study aims to examine the different patterns of wing rock motion at different angles of attack. flow mechanisms of the motion patterns are also revealed, especially the uncommanded lateral motions, including wing rock and lateral deflection, induced by regular asymmetric separated flow from wings at low angles of attack and forebody asymmetric vortices at angles of attack of 27.5 ° ≦ α ≦ 70 °. The test conditions, including the testing Reynolds number, wind tunnel, experimental techniques, and test model, are all the same as those used in a previous study at α = 52.5 ° .Finally, the experimental technique of rotating nose of the model to suppress the wing rock or lateral deflection, which is induced by forebody asymmet ric vortex flow, is applied. The uncommanded lateral motions are successfully suppressed by this technique.