STUDY OF MECHANISM OF BREAKDOWN IN LAMINAR-TURBULENT TRANSITION OF SUPERSONIC BOUNDARY LAYER ON FLAT PLATE
STUDY OF MECHANISM OF BREAKDOWN IN LAMINAR-TURBULENT TRANSITION OF SUPERSONIC BOUNDARY LAYER ON FLAT PLATE
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DOI：
10.1007/s10483-006-0401-1
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发表时间：
2006-04
影响因子：
4.4
通讯作者：
曹伟;黄章峰;周恒
中科院分区：
文献类型：
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作者：
曹伟;黄章峰;周恒
采用空间模式直接数值模拟方法，研究了马赫数为4.5的平板上超音速边界层层流-湍流转变的破裂机理。分析结果表明，在层流-湍流转变的破碎过程中，平均流型由层流迅速演变为湍流型的机理是扰动对平均流型的修正，当扰动变大时，平均流型的稳定性会发生显著变化。尽管对于层流，最不稳定的T-S波是第二模，但第一模波在层流-湍流转变的破裂过程中起着关键作用。
Spatial mode direct numerical simulation has been applied to study the mechanism of breakdown in laminar-turbulent transition of a supersonic boundary layer on a flat plate with Mach number 4.5. Analysis of the result showed that, during the breakdown process in laminar-turbulent transition, the mechanism causing the mean flow profile to evolve swiftly from laminar to turbulent was that the modification of mean flow profile by the disturbance, when they became larger, leads to remarkable change of its stability characteristics. Though the most unstable T-S wave was of second mode for laminar flow, the first mode waves played the key role in the breakdown process in laminar-turbulent transition.