结果表明，扰动波矢轴向分量的存在引起新的不稳定性。

Our results indicate that the axial component of wavevector of perturbation can lead to a new instability.

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本文用数值计算的方法研究流动稳定性问题中小扰动波的传播速度。

In this paper, by using the direct numerical simulation method, the propagation speed of small amplitude disturbances in the problem of hydrodynamic stability is investigated.

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基于BBGKY方程，采用二阶扰动理论探索了可观物理量与扰动波矢的相互关系。

The relationship between physically observable quantities and perturbed wave vector is explored on the basis of BBGKY hierarchy equations and the second order perturbation theory.

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