Theoretical and experimental study of wavelike disturbances in round free jet with emphasis being placed on orderly structures
Abstract
An equation for the velocity field in a round free jet is proposed and applied to a simple model considered as a basic flow. Theoretical results are compared to experimental ones obtained in a jet flow and in an acoustic far field. The orderly structures in such flows are found to be axisymmetric neutral slow disturbances; viscous effects may play a role even at high Reynolds number. Excitation of the jet in the subsonic range produces a large increase in the velocity coherence; the radiated noise, however, increases only in the case of large excitation levels.
- Publication:
-
Mechanics of Sound Generation in Flows
- Pub Date:
- 1979
- Bibcode:
- 1979msgf.proc..167H
- Keywords:
-
- Aerodynamic Noise;
- Computational Fluid Dynamics;
- Free Jets;
- Performance Tests;
- Sound Waves;
- Velocity Distribution;
- Inviscid Flow;
- Mach Number;
- Performance Prediction;
- Acoustics