The positions where shock waves happen inside ejectors vary based on working conditions and dimension of ejectors, and the influence from shock waves occur would finally affect the overall performance of ejectors. In this research Schlieren photography method is adapted to visualize the characteristics of shock waves inside the ejector. Comparison of driving flow characteristics between converging nozzle and de Laval nozzle are conducted in the free-jet condition, and the converging nozzle is applied into the ejector to investigate driving flow expansion inside mixing section. By combining visualization experiment and numerical simulation results, the characteristics of shock waves occur in the driving flow are concluded, and the relationship between driving flow expansion and ejector`s performance is also discussed in this research.
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