Effect of Angle of Attack on Cavity Flow Oscillations
Final rept. on Phase 2
JET PROPULSION LAB PASADENA CA
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Separated subsonic flow over cavities of several widths and depths located on fuze-nose and ellipsoidal axisymmetric bodies have been investigated experimentally at various angles of attack to the free-stream. The fluctuating and mean velocities and pressures inside the cavity were measured at various circumferential locations. Large circumferential variations in the root mean square pressure fluctuations were observed in the cavity at an angle of attack. The hotwire measurements of velocity fluctuations showed that the circumferential variations in cavity pressure oscillations were caused by the loss of spanwise coherency of the large-scale structures around the cavity. Visualization of the flow further confirmed that the strength of the cavity pressure fluctuations was closely related to the presence of the large-scale organized fluctuations in the cavity shear flow.
- Fluid Mechanics