PITOT AND STATIC PRESSURE MEASUREMENTS IN THE SEPARATED REGION OF SPIKED CYLINDER IN HYPERSONIC FLOW.
AEROSPACE RESEARCH LABS OFFICE OF AEROSPACE RESEARCH WRIGHT-PATTERSON AFB OHIO
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Pressure measurements were made in the region of separation induced by a sharp spike ahead of a flat faced, right circular cylinder at Mach 11.6. The pressures on the face of the cylinder were measured with both surface orifices and a traversing probe. A pitot survey was also made of the free shear layer. The results indicate that the face traversing probe did not influence the separated region greatly and gave pressure values generally in agreement with the surface orifices. The pitot probe, which was inserted farther upstream, influenced the separated region more critically, but not so much as to preclude the production of useful pitot surveys. Chapmans two-dimensional theory predicted well the maximum pressure on the model face as determined by the face traversing probe. Moreover, the tests indicated that a uniform static plateau pressure characterized the separated region. This plateau pressure was slightly Reynolds number dependent. Thus the Chapman-Korst separation and reattachment model seems generally to cover the test configuration. A simplified analysis was made using the pitot survey of the free shear layer one body radius ahead of the model face. The results showed that the Mach number on the dividing streamline was sonic or supersonic and that the speed on the dividing streamline was from 0.4 to 0.6 of the external speed. Author
- Fluid Mechanics