Effect of a Shear Layer on the Stability of an Axisymmetric External Compression Air Intake,
FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OH
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This paper presents the effect of six shear layers with strength ranging from 5-11 entering the lip in various positions on the stability of a variable center cone external compression air intake under the condition of a M 1.72 incident stream. It was experimentally proven that a shear layer below 10 in strength entering the axisymmetric intake near the lip did not cause boundary layer preparation inside the intake cowl. A shear layer up to 11 in strength could enter the intake duct in any position at its entrance without causing buzz. The literature shows a shear layer with 6 to 7 strength can lead to a buzz in a two-dimensional air intake. Thereby, it was demonstrated that an axisymmetric intake duct has a higher resistance to buzz caused by the shear layer.
- Fluid Mechanics