EXPERIMENTAL STUDY ON THE FLOWFIELD AND SPRAY DOWNSTREAM DOUBLE-RADIAL SWIRL CUPS
Swirl cups have become a typical design in gas turbine combustors. The combustor performance, operability, lean blow-out LBO, and smoke emissions were controlled by the design features of swirl cups. The flowfield characteristics and fuel atomization downstream double-radial swirl cups, which are co-axial,counter-rotating, were studied using a two-component Particle Dynamics Analyzer(PDA) at atmospheric condition,and the air pressure drop was 5KPa.The swirl numbers of the primary swirler(SN1) and the secondary swirler(SN2) systematically varied. The 3-D velocity components,diameter, and volume flux of fuel droplets were measured. The results showed that the flowfield generated by the counter-rotating swirl cups are very complex, and characterized by a strong center recirculation zone(CRZ),corner vertex and annular flow zone with high speed. The width of the CRZ and negative velocities increase slightly as the swirl number of the primary swirler (SN1) increases. But the SN2 has little influence on the flow filed. The fuel atomization and distribution were controlled by the gaseous flow field. The Sauter Mean Diameter(SMD) and fuel distribution revealed a hollow cone structure of the spray.The increase of SN1 can improve fuel atomization, but the SN2 has little influence on fuel atomization and distribution..
Zhihui Guo Yaopeng Diao Yong Huang
School of Jet Propulsion, National Key Laboratory on Aero-Engines Beijing University of Aeronautics and Astronautics, 10083, CHINA
国际会议
昆明
英文
97-103
2006-09-18（万方平台首次上网日期，不代表论文的发表时间）