南京航空航天大学学报（英文版）2000，Vol.17Issue(1)：26-30,5.
横流不稳定性实验中转捩阶段的进一步观察
FURTHER OBSERVATIONS OF LATE TRANSITION PROCESSES IN CROSSFLOW INSTABILITY EXPERIMENT
吴永健 1明晓1
作者信息
- 1. 南京航空航天大学空气动力学系,南京,210016
- 折叠
摘要
Abstract
The experiments of primary and secondary instabilities with controlled excitation are carried out on a swept flat plate to study the process leading to the final breakdown of laminar flow. Two types of high frequency secondary instabilities are identified. The most amplified mode is centered about the inflection point of the crosswise profile of the boundary layer and is interpreted as inflectional instability, the other occurs in the one third of the boundary layer from the wall. The high frequency disturbances are highly amplified but they also saturate similarly to the primary and nonlinearly generated disturbances. Their main effect in the final breakdown seems interact with the disturbances is developed and thus widens the frequency spectrum to turbulent state.关键词
三维附面层/横流不稳定性/二次不稳定性/转捩/破碎Key words
three dimensional boundary layer/cross-flow instability/secondary instability/final onset of transition/breakdown分类
航空航天引用本文复制引用
吴永健,明晓..横流不稳定性实验中转捩阶段的进一步观察[J].南京航空航天大学学报（英文版）,2000,17(1):26-30,5.
