Title: Numerical Simulation on Performance of Two-Phase Ejector Refrigeration Cycle With A Two-Throat Nozzle Ejector
Abstract: In this paper,the internal flow characteristics of the two phase flow ejector were simulated numerically,the performance of the ejector and the transcritical CO2 refrigeration system with different geometric size of ejectors under different working conditions were compared to find the affecting factors of the two phase flow ejector. The effects of cross-sectional area of the first nozzle throat and working conditions on the performance of the dual-throat nozzle ejector were analyzed. The conclusions as follow: under the working condition of fixed gas cooler outlet pressure / temperature 9. 00 MPa /43℃ and evaporating temperature 6℃,the numerical simulation a results indicates that the performance of the dual-throat nozzle ejector firstly increases and then decreases with the increases in the cross-sectional throat area of the first nozzle,the entrainment ratio of the dual-throat nozzle ejector achieves the maximum as the across-sectional throat area of the first nozzle is 1. 54mm2; The simulation results indicates that the entrainment ratio of the dual-throat nozzle ejector increases with the increase in the gas cooler outlet temperature and decreases with the increase in the evaporating temperature as the cross-sectional throat area of the first nozzle is 1. 54 mm2. Under the working condition of fixed gas cooler outlet pressure / evaporating temperature 9. 00 MPa /6℃,the entrainment ratio achieves the maximum as the condensing temperature is about 43℃.
Publication Year: 2015
Publication Date: 2015-01-01
Language: en
Type: article
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