The Influence of Structural Parameters on Ejector Performance
Focusing on the hydrogen ejector used in fuel cells,a CFD simulation model was established to study the influence of structural parameters,such as the nozzle throat diameter Dt,the nozzle angle φ and the mixing chamber diameter D,on the ejector's performance.The results show that the influence of structural parameters on the ejector's performance varies across different power levels of the fuel cell stack.In the low-power range,the entrainment ratio significantly increases with the nozzle angle,while in the high-power range,the entrainment ratio decreases as the nozzle angle increases.The influence of the mixing chamber diameter on the ejector's performance is opposite.In the low-power range,the entrainment ratio decreases as the mixing chamber diameter increases,while in the high-power range,the entrainment ratio increases with the mixing chamber diameter.Based on the influence patterns,the design method for key structural parameters of the ejector was developed,and the optimal parameter range was obtained.
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