ON SECONDARY INSTABILITY WITH RESPECT TO THREE DIMENSIONAL SUBHARMONIC DISTURBANCES IN BOUNDARY LAYER

摘要

The general equations of secondary instability with respect to three-dimensional subharmonicdisturbances are derived and applied to Blasius boundary layer in the present paper.The theoretical results ofevolution and spatial distribution of subharmonic disturbances are compared with experimental data.The re-suits show the important role of the process of route to transition in low-disturbance environments,and indi-cate that spatial mode is more rational than temporal mode.