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文章对采用两段式喷嘴的引射器及其两相流引射制冷系统在不同工况、不同几何尺寸条件下进行了实验研究。实验结果表明,在实验工况固定的条件下,采用两段式喷嘴的CO_2两相流引射制冷系统的COP随引射器第一喉部直径的增大而增大,引射比随第一喉部直径的增大而减小;系统COP和引射比随引射器中间连接直径的增大而减小。对于固定几何尺寸的引射器,系统COP随气冷器出口压力的升高而增大,引射比随气冷器出口压力的升高先减小后增大,在9MPa时引射比最小。与传统的CO_2制冷系统相比,采用两段式喷嘴的CO2两相流引射制冷系统的COP在不同工况的条件下均高于传统系统的COP,最大可提高约15%。
In this paper, two-stage nozzle ejector and its two-phase flow injection refrigeration system under different conditions, different geometry conditions were studied. The experimental results show that under the condition of fixed experimental conditions, the COP of CO_2 two-phase flow injection refrigeration system with two-stage nozzle increases with the increase of the diameter of the first throat of the ejector. The diameter of the throat decreases and the COP of the system decreases with the increase of the middle diameter of the ejector. For a fixed geometry ejector, the COP of the system increases with the increase of the outlet pressure of the gas cooler. The ejecting ratio decreases first and then increases with the increase of the outlet pressure of the gas cooler, and the ejecting ratio is the smallest at 9 MPa . Compared with the traditional CO_2 refrigeration system, the COP of two-phase CO2 two-phase injection refrigeration system with two-stage nozzles is higher than that of the traditional system under different operating conditions, and the maximum COP can be increased by about 15%.