Control Of Boundary Layer Separation
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- The injection of fluid through porous wall can also control the boundary layer separation. This is generally accomplished by
blowing high energy fluid particles tangentially from the location where separation would have taken place otherwise. This is shown in Fig. 31.3.
- The injection of fluid promotes turbulence
- This increases skin friction. But the form drag is reduced considerably due to suppression of flow separation
- The reduction in form drag is quite significant and increase in skin friction drag can be ignored.
Fig. 31.3 Boundary layer control by blowing
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