Abstract
The characteristic of the spray within combustion chamber is one of the determining factors that affect the performance and exhaust gas emissions of an aero-engine. Recently, the holography technique has been successfully applied to spray atomization measurement due to its significant advances. In this article, an atmospheric test rig of pressure-swirl nozzle is built. The kerosene spray generated at the atmospheric condition and in an aero-engine combustor is measured. The Sauter mean diameter of the spray droplets is obtained. In addition, the theoretical analysis of film formation and sheet breakup processes are conducted. Comparison of theoretical analysis and experimental results on the spray atomization of a pressure-swirl nozzle is presented.
Highlights
Pressure-swirl nozzles are widely used in fuel systems of aero-engine due to their excellent atomization characteristics and simple geometry
FZ Batarseh et al.[7] studied the aerodynamic instability of the atomizer spray based on high-speed video system and proper orthogonal decomposition (POD) method
The main conclusions can be summarized as follows: 1. The structure of a kerosene spray generated by a pressure-swirl nozzle is analyzed by means of a laser holography system
Summary
Pressure-swirl nozzles are widely used in fuel systems of aero-engine due to their excellent atomization characteristics and simple geometry. The quality of liquid fuel atomization highly affects the formation of pollutants, combustion stability, and engine performance especially at high altitudes and low flight speed conditions. Spray characteristics and performance of pressure-swirl nozzles have been extensively investigated. AH Lefebvre and colleagues[1,2] discussed the application of pressure-swirl nozzles in gas turbine combustion chambers, including the design procedures, theoretical analysis, and performance prediction. SM Jeng et al.[3] collaboratively investigated the fuel atomization process formed by a swirl cup using a phase Doppler particle analyzer (PDPA) system. C Liu et al.[6] investigated the relationship between spray pattern and combustion stability of a swirl cup combustor using planar laser-induced fluorescence (PLIF) and computational fluid dynamics (CFD). FZ Batarseh et al.[7] studied the aerodynamic instability of the atomizer spray based on high-speed video system and proper orthogonal decomposition (POD) method
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