Flow oscillations in a channel with sudden cross section increase
Abstract
The oscillations of the flow field in a channel with rectangular cross section and a jump in channel width were investigated using high frequency interferometry. Three different types of flow instability were found to lead to flow oscillations. Decreasing pressure difference in the channel leads subsequently to separation oscillations, shock oscillations, and dead water oscillations, the latter being the most important. The oscillation frequency is determined by the channel length. The oscillation mechanism is based on an interaction between compression shock and flow separation.
- Publication:
-
NASA STI/Recon Technical Report N
- Pub Date:
- August 1976
- Bibcode:
- 1976STIN...7724438A
- Keywords:
-
- Channel Flow;
- Cross Sections;
- Flow Stability;
- Oscillating Flow;
- Flow Distribution;
- Gas Flow;
- Interferometry;
- Pressure Distribution;
- Shock Waves;
- Steady Flow;
- Subsonic Flow;
- Supersonic Flow;
- Fluid Mechanics and Heat Transfer