The effect of ambient pressure on the spray characteristics of a twin-fluid atomizer
Abstract
A combined simplex/air-assist atomizer with swirl is characterized in an isothermal high-pressure spray-characterization chamber, with optical access, under various ambient pressures. A single-component, phase Doppler laser interferometer is used to obtain spatially resolved droplet size and velocity information. Data are obtained at atmospheric pressure as well as 3 and 6 atmospheres for conditions of constant fuel and atomizing air flow rates. Two different nozzle air flow rates and, hence, two different air-to-liquid ratios are considered. Increasing ambient pressure decreases the air-to-liquid momentum ratio and thereby decreases droplet mean axial velocity and increases the droplet size. The response of a spray to increasing ambient pressure is sensitive to the parameters which are held constant while increasing ambient pressure.
- Publication:
-
ASME, 35th International Gas Turbine and Aeroengine Congress and Exposition
- Pub Date:
- June 1990
- Bibcode:
- 1990gatu.confY....D
- Keywords:
-
- Atomizers;
- Combustion Chambers;
- Drop Size;
- Laser Doppler Velocimeters;
- Spray Characteristics;
- Velocity Measurement;
- Air Flow;
- Atmospheric Pressure;
- Gas Turbine Engines;
- Fluid Mechanics and Heat Transfer