Study on Flow Distribution and Structure Optimization in a Mix Chamber and Diffuser of a CO2 Two-Phase Ejector

This paper establishes a mathematic model of CO2 two-phase ejector to investigate flow distribution in the components mixing chamber and diffuser. The suction was modeled using characteristic line method describe development process supersonic expansion wave, chamber, as well diffuser models, were built based on double-flow model. reliability verified by experimental data. distributions parameters along axis analyzed under different ratios ejector. Structure optimizations conducted. results showed that primary temperature gradually increased diffuser, but Mach number decreased for certain ratio. secondary opposite trend. Moreover, at initial stage mixing, fluid pressure rapidly, rapidly. gas-phase fraction stable When length–diameter ratio about 10.8–12, it beneficial mix uniformity, when angle 4–6°, had better efficiency.