In this study, computational fluid dynamics (CFD) was used to investigate the performance of the steam ejector used in refrigeration systems to increase operational flexibility and COP. A 2D-axisymetric model of a two-stage ejector (TSE) was developed and its performance was compared to that of the commonly used single-stage ejector. The SST k-omega (k-ω-sst) model was applied as a turbulence model. In the simulation, the TSE was analyzed using generator temperatures between 100 and 130°C and evaporator temperatures between 0 and 15°C, as in a previous study. The CFD simulation results showed that the TSE provided high entrainment ratios up to 77.2% while showing a marginal decrease in the critical back pressure up to a maximum value of 21.9%. Therefore, it can be concluded that the TSE can significantly benefit refrigeration systems requiring high refrigerating capacity while maintaining a slightly low condensing pressure.

在这项研究中，使用计算流体动力学（CFD）来研究制冷系统中使用的蒸汽喷射器的性能，以提高操作灵活性和COP。开发了两级喷射器（TSE）的二维轴向模型，并将其性能与常用的单级喷射器进行了比较。在SST ķ -omega（ķ - ω-sst）模型被用作湍流模型。在仿真中，与以前的研究一样，使用100至130°C的发电机温度和0至15°C的蒸发器温度对TSE进行了分析。CFD仿真结果表明，TSE提供了高达77.2％的高夹带率，同时显示出临界背压略有下降，最大值降低到21.9％。因此，可以得出结论，TSE可以显着受益于需要高制冷能力的制冷系统，同时保持稍低的冷凝压力。