The evolution of a suddenly initiated, semi-confined, two-dimensional, turbulent jet
Abstract
The starting transient of a fluid amplifier supply jet was investigated. Experiments covered aspect-ratios from 1 to 2 and Reynolds (flow) numbers from 5,000 to 40,000 within 40 nozzle widths of the nozzle exit plane from the period preceding initiation until steady flow was established. Submerged, confined, rectangular, water jets supplied by a gas-pressurized reservoir and initiated by a solenoid-pilot operated valve were recorded with a high speed camera. A mathematical model was formulated for the fluid heat that precedes the starting jet. The experimental results indicate: that the flow number had a minor effect on the starting jets studied, that reducing the aspect-ratio reduced growth of the head diameter as a function of position, and that the supply flow risetime had a significant effect on the speed at which the starting jet moved downstream.
- Publication:
-
Ph.D. Thesis
- Pub Date:
- 1977
- Bibcode:
- 1977PhDT........22Y
- Keywords:
-
- Spray Nozzles;
- Turbulent Flow;
- Two Dimensional Jets;
- Jet Flow;
- Mathematical Models;
- Reynolds Number;
- Fluid Mechanics and Heat Transfer