Necessary conditions for starting and maintaining a stable oscillatory flow in a Hartmann-Sprenger tube
Abstract
An investigation is conducted into the nature of the excitation of the flow into a Hartmann-Sprenger tube which generates oscillations; detailed measurements are made in the flow field between the nozzle and the open end of the tube by means of a noninvasive shadowphotographic technique that yields data for qualitative oscillatory flow behavior. It is shown that the low pressure region outside the tube, near the open end, is a necessary condition for the initiation and maintenance of flow oscillation. The low pressure region is obtainable when the flow pressure ahead of the open tube end possesses a positive gradient.
- Publication:
-
Flow Visualization IV
- Pub Date:
- 1987
- Bibcode:
- 1987flvi.proc..507I
- Keywords:
-
- Air Jets;
- Flow Stability;
- Flow Visualization;
- Hartmann Flow;
- Oscillating Flow;
- Aerodynamic Heating;
- Convergent Nozzles;
- Flow Distribution;
- Shadowgraph Photography;
- Sonic Nozzles;
- Fluid Mechanics and Heat Transfer