主燃级喷嘴和燃油分级后雾化特性实验研究

In order to optimize combustion performance of high temperature rise combustor, the spray characteristic of triple swirler combustor was experimentally studied. The pilot stage of centrifugal atomizer adopted pressure atomization and air atomization. The main stage adopted prefilming air atomization. Phase Doppler particle analyzer was used to study on spray characteristics of main injector and fuel grade ration. Sauter mean diameter was measured at different head pressure drop and fuel mass flows at different axial distances and radial distances. High speed photography was also used to take spray pictures of different conditions. The experimental results show that the Sauter mean diameter distribution of main injector spray is between 50~80μm. Good atomization can be achieved when air-liquid ratio is bigger than 3.5. With the increase of axial distance, the diameter of droplets increases and fuel concentration becomes uniform. When fuel grade ratio increases, the diameter of droplets decreases about 10μm, the area of influence is concentrated in the central area, the periphery of spray is less impacted on.