Gas–Liquid Fluidic Throat

Abstract

In the engine, if the secondary flow is a liquid that can react with the fuel gas, the gas–liquid fluidic throat in the nozzle can be roughly divided into four regions: an extrusion zone of secondary flow, a gasification zone, a chemical reaction zone, and a mainstream area. The liquid phase state injected through the secondary flow injector, such as a liquid belt or droplet, directly affects the extrusion of the gas–liquid fluidic throat and the size of the gasification zone. If the liquid secondary flow is well atomized at the nozzle to form fine droplets, in addition to its own volume extrusion, the interaction of the droplets with the mainstream flow will increase, increasing the flow resistance of the mainstream flow. In addition, the surface area of the liquid secondary flow increases after the formation of the droplets, the evaporation enhances, and the gasification zone enlarges. The mixing rate of the gas phase in the reaction zone and the reaction rate are also dependent on the atomization and evaporation of the secondary flow at the nozzle. The effect of different injectors on the atomization characteristics under conditions with different ratios of secondary flow rate to mainstream flow rate in different secondary flow injection modes is introduced in this chapter.