科研之友
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摘要
The local two-dimensional stability characteristics of a confined compressible mixing layer with a hyperbolic tangent velocity profile are studied on an inviscid basis. By examining the temporal growth rate at the saddle point in the wave number space, the flow is characterized as being either absolutely unstable or convectively unstable. Results are presented, showing the amount of backflow necessary to have this type of transition for a range of primary flow Mach number, M(1), up to 3.0. The transition curve for M(1) between zero and 1.0 and between 1.35 and 3.0 is defined by a single curve. However, for M(1) between 1.0 and 1.35, multiple transition curves exist, due to the fact that multiple modes exist when M(1) is greater than unity. In this region the mode that becomes absolutely unstable depends on the magnitude of the back flow.
- 出版日期1994-9
