Numerical study on the mechanism and characteristics of coaxial jet atomization in central staged combustors
The gas-liquid coaxial jet atomization has significant applications in advanced aero-engine combustors.A simplified model of coaxial jet atomization was designed,which adopted the VOF-LES(Volume of fluid-large eddy simulation)method to numerically simulate the atomization process of a gas-liquid coaxial jet under the pressure condition of 2.7 MPa.The influences of airflow velocity and fuel supply pressure perturbation on the atomization process and characteristics of the liquid jet were investigated.It's found that with the increase of airflow velocity,the liquid jet broke up more quickly,and the SMD(Sauter mean diameter)decreased significantly.However,the impact of airflow velocity on the atomization of the liquid jet diminished after it reached 140 m/s.The influence of fuel supply pressure perturbation on the jet atomization process was relatively weak.When the amplitude of pressure perturbation was between 3% and 5% of the fuel supply pressure difference,the atomization of the liquid jet was improved.
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