| EXPERIMENTAL STUDY OF FLOWFIELD STRUCTURE AROUND AN OGIVE-CYLINDER |
| |
| 作者单位： | Ph.D.Candidate:Wang Gang Fluid Mechanics Institute，Beijing University of Aeronautics and Astronautics，Beijing 100083，China，Supervisor: Deng Xue ying (Beijing University of Aeronautics and Astronautics) Members of Dissertation Defense Committee: Tong Bing gang (Graduate School of the Chinese Academy of Sciences)，Chairman Gu Zhi fu (Peking University) Yang Qi de (China Aerodynamics Research and Development Center) Lv Zhi yong (Beijing University of Aeronautics and Astronautics) Liu Pei qing (Beijing University of Aeronautics and Astronautics) |
| |
| 摘 要： | BRIEFINTRODUCTIONOFTHEPAPER : Theflowfieldaroundaslenderbodyatalargeangleofattackbecomesasymmetricandahighsideforceandyawmomentareexertedonthebody .(1)Thetypicalflowsubstantialstructureissuccessfullyvisualizedbyexperiments ,andtheflowfieldaroundtheslenderbodywiththechang ingofangleofattackcanbeclassifiedintosixregimesaccordingtodifferentflowpatternsanditsaerodynamiccharacteristics .Thelargeanglesofattackfromwhichahighsideforceappearsisboundedas 4 5° α 6 0° .(2 )Thespatial 3 Dc…
|
EXPERIMENTAL STUDY OF FLOWFIELD STRUCTURE AROUND AN OGIVE-CYLINDER |
| |
| Authors: | Wang Gang |
| |
| Abstract: | The flowfield structure and their aerodynamic characteristics over an ogive cylinder were studied by means of flow visualization and surface pressure measurement in a water tunnel and a wind tunnel. The existence of multi asymmetric vortices over long slender bodies was experimentally confirmed at large angles of attack and in the subcritical Reynolds number range. The spatial 3 D characteristics of the multi vortices system were analyzed and a physical model was developed. The topological structure of different patterns in cross flow plane was studied and the mechanism governing the formation of asymmetric vortices and multi vortices was discussed from the viewpoint of stability of the topological structure. It was concluded that the maximum in the sectional side force distribution curve are not caused by the shedding of higher position vortex, but by the cross over to the symmetric plane of the lower position vortex. |
| |
| Keywords: | slender body asymmetric vortices large angle of attack aerodynamics |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
