On the structure of velocity and pressure fluctuations in a sound-influenced free jet
Abstract
The flow field structure of a sound-influenced free jet was studied to verify results of stability theories. Phase velocities of the amplified disturbances were predicted, exceeding the mean jet velocity for low Strouhal numbers. These ultra rapid waves can in fact be traced experimentally. The occurence of standing wave patterns at higher Strouhal numbers is explained by a model of two downstream traveling waves of the same frequency but with different speeds. One wave is due to the exciting sound wave, and the other represents the excited instability wave.
- Publication:
-
In its Coherent Struct. in Turbulence p 21-43 (SEE N75-14074 05-34
- Pub Date:
- June 1974
- Bibcode:
- 1974cst..nasa...21P
- Keywords:
-
- Free Jets;
- Pressure Distribution;
- Sound Fields;
- Velocity Distribution;
- Coherence;
- Flow Distribution;
- Flow Stability;
- Loudspeakers;
- Shear Flow;
- Shear Layers;
- Traveling Waves;
- Fluid Mechanics and Heat Transfer