Re数对细长旋成体非对称涡及气动力特性影响的实验研究

Experimental study of Reynolds numbers effect on asymmetric vortices and their aerodynamic characteristics over a slender body

通过对细长拱柱旋成体大迎角绕流不同截面测压结果分析,探讨了绕流Re数对非对称涡结构和气动特性的影响,得出Re数不仅影响分离线位置和绕流流态结构,而且影响边界层的绕流特征及其分离涡的强度,非对称性的出现与细长体两侧边界层的绕流特征和分离涡的强度不等存在密切的关系。特别是在同种流态下,两侧边界层的绕流特征和分离涡强度不等是造成侧向力的主要原因;在两侧不同的流态下,转捩不对称是产生大侧向力的主要原因。

By analyzing experimental pressure distribution on a ogive-nosed slender body at high angles of attack, the Reynolds numbers effect on asymmetric vortices and its aerodynamic characteristics around the slender body are discussed, some useful conclusions are drawn: Reynolds numbers affect not only the separation line position and the structure of flow pattern but also the boundary layer flow characteristics and strength of separation vortices. The onset of asymmetric vortex has pertinence with the asymmetry of the boundary layer characteristic and strength of separation vortices at two side of the slender body. Especially,under the same flow pattern, such asymmetry is the main reason for producing side force; while under the different flow pattern at the two side of the body, asymmetrical flow transition at the two side is the main reason for producing side force.