Experimental Investigation and Numerical Simulation about the Multi-nozzle Ejector

In order to study the factors of influencing the effect of general performance of multi-nozzle ejector, we do an experiment with five-nozzle ejectors and obtain the relation curves between momentum correction factor Km and geometric parameter of the ejector system. The experimental results and numerical calculations indicate that in any cases performance of the multi-nozzle ejector decreases with the increase of pressure ratio or mass flow rate of primary flow, and in certain ranges the performance increases as the number of primary flow nozzle as well, otherwise, the performance goes down as the length of diffuser and the diameter of nozzle throat increase. The interaction of the ratio of length and the diameter of mixing pipe and the distribution of the primary nozzle has great effects on the performance of the entrainment for the ejector, and numerical methods have been employed to study the effects of the geometric parameters. The numerical results agree with experimental data.