Numerical Simulation And Experiment Investigation Of Multi-Nozzle Supersonic Ejector

The CFD and experimental methods were introduced to study the multi-nozzle supersonic ejector.Firstly, the flow-field of a two dimensional ejector with and without induced flow was simulated, the key parameters affecting the starting performance and ejecting performance, such as the primary flow mach number, were analyzed. The 3-D numerical results approximately agreed with the experiment data. At the same time, the following conclusions could be drawn: the flow loss caused by the collision of multi-primary flow was the chief reason for difficulties in starting of the ejector; by increasing the mixing area, improved ejecting performance could be obtained by multi-nozzle.The influences of ejecting-nozzle assembling configuration and the contraction ratio of mixing chamber on the starting performance were studied in detail, and some valuable conclusions could be drawn. It was found that the secondary-flow could act as a"booster", which helped to improve starting performance of the multi-nozzle ejector. Moreover, it was discovered that the lower the primary flow total pressure, the better for the secondary flow with lower total pressure to be ejected; and a reasonable ejecting-nozzle assembling configuration meant good performance for multi-nozzle ejector.