In this paper, an ejector-based multi-evaporator refrigeration system is proposed for the tropical region refrigerated trucks. CFD simulations are performed to study the auxiliary entrainment effect of the ejector operated in air-conditioning - freezing mode. First, the performance of the ejector with various auxiliary hole position in different chambers is investigated. Then, based on the optimal auxiliary hole position of each chamber, the influence of double and triple auxiliary holes on the ejector performance is identified. Next, optimal angle with the optimized auxiliary hole position is determined. Last, the effect of the ejector area ratio on optimal auxiliary hole position, angle and entrainment ratio is evaluated. The main results show that: (1) Optimal auxiliary hole position is 59.5 mm or the length ratio of distance between the inlet of constant-area mixing chamber and the auxiliary hole center point to the length of the constant-area mixing chamber is 1.90, and optimal auxiliary hole angle is 45°; (2) The effect of the auxiliary hole position on the ejector performance is stronger than the auxiliary hole angle; (3) the optimum auxiliary hole position, angle as well as entrainment ratio are affected by the ejector area ratio.

本文针对热带地区的冷藏车，提出了一种基于喷射器的多蒸发器制冷系统。进行CFD模拟以研究在空调-冷冻模式下运行的喷射器的辅助夹带效果。首先，研究了在不同腔室中具有各种辅助孔位置的喷射器的性能。然后，根据每个腔室的最佳辅助孔位置，确定双重和三个辅助孔对喷射器性能的影响。接下来，确定具有最佳辅助孔位置的最佳角度。最后，评估顶针面积比对最佳辅助孔位置，角度和夹带比的影响。主要结果表明：（1）最佳辅助孔位置为59。恒定面积混合室的入口到辅助孔中心点的距离与恒定面积混合室的长度的长度之比为5mm或1.90，最佳辅助孔角为45°；（2）辅助孔位置对喷射器性能的影响大于辅助孔角度；（3）最佳辅助孔的位置，角度以及夹带率受顶针面积比的影响。