PRESSURE DISTRIBUTION ON A SURFACE WITH LARGE NORMAL INJECTION.
GENERAL APPLIED SCIENCE LABS INC WESTBURY NY
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The changes in forces acting on a body moving at high speed due to large normal injection are investigated. The velocity at the wall, v sub w, is assumed to be much larger than the value allowed for the boundary layer theory. On the other hand for a body moving at high speed, u sub e, it is justifiable to consider only v sub w u sub e. The analysis is, therefore, based on these two conditions. On account of the first condition the flow field is governed by the inviscid equations with a discontinuity in velocity along the streamline which separates the inner region of the injected fluid from the outer region of free stream. On account of the second assumption, the flow field in the inner region can be assumed to be incompressible. Depending on the Mach number of the free stream and the body shape, one can use either linearized supersonic theory or others for the outer region. The boundary condition along the dividing streamline is then established. For the case of a wedge with constant stagnation pressure for the injectant, analytic solutions are obtained from which the force and moment can be computed. Author
- Fluid Mechanics