The aim of this paper is to track the transition between the absolute instability and convective instability in a compressible shear layer.
This study focuses on the transition between absolute instability (AI) and convective instability (CI) for a compressible inviscid shear layer, which are dominated by modes with zero group velocity.
The effect of velocity ratio [LAMBDA] on the absolute instability of an inviscid shear layer is illustrated in Figure 3.
Hence the strategy for suppressing absolute instability is to increase temperature ratio.
However, the temperature effects do not always tend to depress the absolute instability. When the temperature ratio is relatively small ([S.sub.T] < 1), the absolute growth rates shows minor increase with increase of [S.sub.T] for every case.
Now, we check the effect of obliquity of the disturbance wave on the absolute instability by varying the oblique angle, [phi].
The parameter M is naturally supposed to be parameter influencing the absolute instability behavior of flow.
Figure 7 shows the critical value of [LAMBDA] at which the flow transits into absolute instability at different M and [S.sub.T].
In this work, we explore the transition of absolute instability and convective instability in a compressible inviscid shear layer, through a linear spatial-temporal instability analysis.
Absolute instability [DELTA][[theta].sub.v,dry] = 0 [??] [chi]* = [[chi].sub.c].
Also note that the absolute instability regime is marked by isolines of [delta][[theta].sub.v,m,min] = 0.