Numerical simulation and results analyzing on low-pressure swirl nozzle spray characteristics

DONG Xing-tao， SUN Lei， LU De-lin， LI Chao， WANG Chang-zhi
（College of Mechanical Engineering， Zhejiang University of Technology， Hangzhou 310014，China）

Abstract：In order to improve the swirl nozzle atomization under low pressure，the five factors which affecting the low-pressure swirl nozzle atomization were investigated，which were swirling chamber diameter D，swirling chamber height H，nozzle exit diameter d，nozzle exit length l and swirling entrance number n. Sixteen groups of nozzle structural parameters were designed by the way of orthogonal experimental design. The unstructured mesh was gotten with Gambit，the inlet boundary conditions is pressure-inlet and the gauge total pressure is 0.3 MPa. the simulation was carried out with fluent6.3 software. The results of the simulation were analyzed through the range analysis method of orthogonal experiment and the order of the influence that the five factors have on the nozzle axial speed and the spray angle was obtained，the optimal parameters was also gotten through the simulation results analyzing. Finally，with the comprehensive analysis，four groups of optimal parameters were gained. The results show that the analysis lays the foundation for the further experimental study of the low-pressure swirl nozzle.
Key words： swirl nozzle； spray characteristic； orthogonal experimental design； numerical simulation