Experiment on atomization of high disturbance fuel nozzle

In order to improve the fuel atomization and verify the feasibility of high perturbed atomization scheme applied to the fuel injection of aero-engine, the spray characteristics of V-shaped cross hole nozzlesand single hole nozzles were measured by using phase Doppler particle analyzer (PDPA) and high-speed photography technology. Results showed that with the increase of injection pressure, the atomization angle increased and the Sauter mean diameter(SMD) value decreased. The cross-hole structure had a significant promoting effect on fuel atomization. Under the same injection pressure and exit cross-section area conditions, the atomization cone angle of the cross-hole was larger and the SMD was smaller; at the same SMD, the required injection pressure of the cross-hole was much smaller than that of the traditional circular straight hole; with the increase of intersection angle, the spray cone angle and SMD were both improved. Air-assisted method can effectively increase the spray cone angle and reduce the SMD value, but the improvement effect decreased gradually with the increase of air pressure. Compared with the traditional single hole nozzle scheme, the high perturbation nozzle can greatly improve the atomization effect of the fuel under the same pressure conditions, and has great potential for aero engine application.