Abstract
In this paper the linear stability of attachmentline boundary layer is considered using the twodimensional eigenvalue approach developed earlier, with modifications to include the effects of compressibility and to improve computational efficiency. Results for hfW=3.5 and 1.6 are presented. In both cases, it was found that the instability is dominated by travelling waves that propagate at oblique angles with respect to the attachment line. For the M,=l.6 case, effects of surface heating on the increase of instability are investigated. Results agree very well with available experimental observations. Additionally, a revisit to the incompressible swept Hiemenz flow is made, and the results reveal that three-dimensional disturbances are more unstable than the two-dimensional disturbance which was previously thought to be the most unstable perturbation in this particular three-dimensional boundary-layer flow. It is therefore concluded that in an attachment-line flow three-dimensional disturbances are the dominant disturbances at all Mach numbers.
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