primary instability meaning in English

主要不稳定性

A high frequency secondary instability mode is detected , which rides on the primary instability wave in time domain and appears at the inflectional point of mean streamwise velocity profile
结果表明，高频二次不稳定性在时域上表现为骑在基频波的特定的相位区域。
Experiments are mainly focused on initial growth of unsteady primary instability , high frequency secondary instabilities both in natural condition and artificial high frequency excitation
重点研究了基频不稳定性扰动的初始增长过程，以及自然条件下与人工高频激励下的高频二次不稳定性扰动发生与发展的一些特性。