摘要
本文提出了一种双喷射器三蒸发器制冷系统,在此系统中将第一个喷射器的出口连接到第二个喷射器的一次流入口,采用二维CFD仿真方法研究各级喷射器关键几何参数对整个两级喷射器的性能影响。首先,通过试验数据验证CFD模型。为满足空调室、冷藏室和冷冻室的制冷负荷需求,寻找两个喷射器的主喷嘴直径。其次,通过仿真研究两级喷射器的面积比、主喷嘴出口位置和等压混合段角度等关键几何尺寸对每个喷射器的性能影响。结果表明,每个喷射器的面积比对其引射率的影响最明显;第一级面积比不仅影响第一级引射率,同时也会影响第二级引射率,而第二级的关键几何尺寸对第一级性能几乎没有影响。
A dual-ejector three-evaporator refrigeration system is proposed in this paper.The outlet of the first ejector is connected to the primary inlet of the second ejector,and a two-dimensional CFD simulation method is used to study the performance of two stages,which are affected by the key geometric parameters of the ejector.First,it is to verify the simulation results of CFD models with experimental data.Secondly,in order to meet the cooling load requirements of the air-conditioning room,the refrigerating room and the freezing room,the main nozzle diameters of the two ejectors are sought.Then,the simulation data are used to verify the impact of key geometrical dimensions such as area ratio,main nozzle outlet position and isobaric mixing section angle on the performance of each ejector.The results show that the area ratio of each ejector has the most obvious effect on its ejection rate;the first-stage area ratio affects not only the first-stage ejection rate but also the second-stage ejection rate.Geometry of the second-stage ejector has almost no effect on the first-stage performance.
作者
蔡青峰
严嘉
Cai Qingfeng;Yan Jia(School of Civil Engineeringand Architecture Southwest University of Science and Technology)
出处
《制冷与空调》
2021年第4期58-64,共7页
Refrigeration and Air-Conditioning
关键词
几何尺寸
双级喷射器
多蒸发器
耦合度
geometric parameter
two-stage ejector
multi-evaporator
coupling
