射流边界中基波与亚谐波相互作用的实验研究

采用外加纵向双频声激励方法，以热线测量为手段，对低速、均质、轴对称射流剪切层的K－H不稳定波与其亚谐波的相位差、对两波非线性相互作用的影响进行了实验研究。结果表明，相位差的不同使非线性相互作用中的亚谐波的空间演化不同。尤其是存在一个很窄的相位差范围，落入其中的相位差使亚谐共振（亚谐波与基波的非线性相互作用的一个特定阶段）显著减弱，这与Monkewitz的理论分析定性一致；而且，相位差对非线性相互作用的影响，随着基波初始强度的增大和亚谐波初始强度的减小而趋于消退。

Experimental study on the interaction between the fundamental and subharmonic waves in a jet boundary

This experiment using two frequency acoustic exciting and an anemometer is made of the influence of the phase difference between the K H unstable wave and its subharmonic on the nonlinear interaction between the two waves in a low speed , homogenious and axisymmetric jet .The findings indicate that different spatial development of the subharmonic occurs when the phase difference has different values, and that there is especially an narrow rang of phase difference, in which the amplitude of the subharmonic wave is notably diminished in the subharmonic resonance. This is qualitatively consistent with the analysis by Monkewitz . As the amplitude of fundamental wave ( K H unstable wave) becomes sufficiently strong and the subharmonic weakens, the influence of the phase difference on the interaction tends to disappearance.