Unsteady Flow Behaviour of a Slender Delta Wing Rock
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摘要: 对前缘后掠角为80°的细长三角翼,迎角为30°和40°时不同滚转角下前缘涡的静态特性,及摇滚过程中的动态旋涡特性进行了流态显示和摄影记录。结果表明:在相同滚转角下,静态和动态情况下旋涡特性有相当大的差别;相对于静态而言翼摇滚过程中存在着旋涡特性的滞后效应;摇滚过程中旋涡垂向位置的滞后是明显的,而展向位置的滞后很小;还发现翼摇滚起始角对旋涡特性有较大影响.Abstract: The flow visualization of vortex behaviour for the two conditions of static and dynamic during wing rock motion was conducted and photograph records were taken for a slender delta wing in a various roll angle at α=30 ° and 40°.Results indicated that the vortex behaviour was quite different at the same roll angle between static and dynamic conditions.The time lag effects of vortex behaviour during wing rock comparing with static condition was observed.The time lag of vertical positions of vortices was apparent during wing rock motion,whereas the time lag was not significant for spanwise positions of vortices.The effect of starting angle of wing rock on the vortex behaviour was considerable.
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Key words:
- slender wings /
- nonsteady folw /
- vortex flow /
- wing rock /
- flow visualization
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