Numerical Simulation on Turbulent Flow in Pressure-Swirl Fuel Atomizers

• Main Authors: KUO KUANG PING, 郭光平
• Other Authors: P. Y. Tzeng
• Format: Others
• Language: zh-TW
• Published: 2000
• Online Access: http://ndltd.ncl.edu.tw/handle/62921136555920279185

碩士 === 中正理工學院 === 兵器系統工程研究所 === 88 === The objective of this research is to develop the capability for the numerical simulation of flow field in pressure-swirl atomizers of gas turbine engines. The flow characteristics inside atomizers under various geometrical and physical conditions are investigated using a CFD code, PHOENICS 3.1. Computations of the sudden contracting pipe flow are performed and validated for the case corresponding to the experiment of Durst and Loy（1985）. The flow features of Simplex nozzle are then simulated to study the influences of orifice diameter, spin chamber diameter and ratio of length to width of slots on the distribution of turbulent kinetic energy, Sauter Mean Diameter (SMD) and spray angle in the outflow region. Comparison of the numerical result and experimental data demonstrate that in general, SMD and spray angle decreased with the increasing turbulent kinetic energy in the outflow region, which may be related to geometrical parameters such as the decrease of orifice diameter. The results obtained from this research provide better understanding of physical mechanism in the internal flow and improved capability of numerical simulation.