摘要
对于平板上的直立钝缘舵在M_∞=1.79、2.04和2.50的条件下,研究了该平板干扰区中的三维分离特性。着重讨论了钝缘直径、舵面迎角和来流马赫数对主分离线位置和形状的影响。分析了该类三维分离在性态上更强地依赖于无粘流动特性。此外,还对分离区内的二次分离发展过程和形态进行了初步讨论。
Three dimensional flow separation induced by blunt fin detached shock wave is one of main flow phenomena in the interaction flow field. A parametric study of flow separation behaviors induced by blunt fins has been carried out at M∞ = 1.79, 2.04 and 2.50 with different diameter of fin leading edge and fin angle range from 6° to 20°. The experimental results show that the primary separation behaviors are mainly controlled by inviscid bow shock wave generated by blunt fin. The inviscid bow shock wave and the primary separation line induced by blunt fin both can be divided into two regions, inner region and outer region. The behaviors in the inner region are controlled by bluntness of the fins and can be correlated by the diameter of the fin leading edge and the behaviors in the outer region are affected by fin angle. Freestream Mach number has no effect on the primary separation line in the inner region. And the primary separation line in the outer region moves forward with decreasing the Mach number. This phenomenon becomes more obvious with increasing the fin angle.In the separation region there are four types of flow patterns with increasing blunt fin shock wave strength. The pattern development shows that the secondary separation develops from close separation to the second type of close separation. And finally it disappears completely.
出处
《空气动力学学报》
CSCD
北大核心
1993年第2期136-142,共7页
Acta Aerodynamica Sinica
基金
国家自然科学基金
国家教委博士点专项科研基金
关键词
激波
边界层干扰
钝缘舵
三维分离
shock wave/boundary layer interaction, blunt fin, three dimensional separation, shock wave.
