Abstract
Using the laser phase Doppler particle analyzer (PDPA), the spray characteristics of gas-liquid coaxial swirl injector were studied. The Sauter mean diameter (SMD), axial velocity and size data rate were measured under different gas injecting pressure drop and liquid injecting pressure drop. Comparing to a single liquid injection, SMD with gas presence is obviously improved. So the gas presence has a significant effect on the atomization of the swirl injector. What’s more, the atomization effect of gas-liquid is enhanced with the increasing of the gas pressure drop. Under the constant gas pressure drop, the injector has an optimal liquid pressure drop under which the atomization performance is best.
Highlights
As the combustion performance and the uniformity of the flow field are closely related to the structure and working parameters of the injector, injector is a key part of the combustion chamber
Under different gas injection pressure drop and liquid injection pressure drop, the spray flow field was measured by phase Doppler particle analyzer (PDPA)
Typical measuring plane were picked to investigate the effect of gas injection pressure drop and liquid injection pressure drop on the atomization characteristics, which is helpful to the gasliquid coaxial injector fine design, ignition location selection, spray flow field calculation and analysis
Summary
As the combustion performance and the uniformity of the flow field are closely related to the structure and working parameters of the injector, injector is a key part of the combustion chamber. Most of them tried to describe the distribution characteristics by the average value of each measurement plane or points in a plane They lack of a detailed study of the spatial distribution of the whole flow field. Under different gas injection pressure drop and liquid injection pressure drop, the spray flow field was measured by PDPA. It analyzed the spatial distribution of gas-liquid coaxial injector in detail. Typical measuring plane were picked to investigate the effect of gas injection pressure drop and liquid injection pressure drop on the atomization characteristics, which is helpful to the gasliquid coaxial injector fine design, ignition location selection, spray flow field calculation and analysis
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