抽吸和压力梯度在层流边界层转捩过程中的作用

用空间模式的二次稳定性理论研究了抽吸和压力梯度对边界层三维亚谐扰动流动稳定性的影响．数值结果表明，固体边界上的抽吸有明显的层流控制作用，逆压梯度则有较强的不稳定作用．

ROLE OF SUCTION AND PRESSUREGRADIENTIN THE TRANSITION PROCCES OF BOUNDARY LAYER

In the paper secondary instability theory is used to analyse the effect of suctionsand pressure gradients on the charact eristics of spatially growing 3-D subharmonic distur-baces in b oundary layer flow. The end res ults indicate that suctions shows an apparentlaminar flow control on the boundary layer flows,and unfavorable pressure gradients haveastrong destability effects.