CAJ | 학술논문

分别对采用拉法尔喷嘴和两段式喷嘴引射器的CO2跨临界两相流制冷系统在不同工况、几何尺寸下进行了实验研究。实验结果表明：在固定几何尺寸条件下，气冷器出口温度和蒸发温度分别为43℃和6℃时，拉法尔喷嘴引射器和两段式喷嘴引射器的引射比均随着气冷器出口压力的升高先增大后减小，分别在8．50M Pa和8．70M Pa取得最大值；两种形式喷嘴引射器的引射比均随着气冷器出口温度的升高而升高；气冷器出口压力和温度分别为8．50M Pa和43℃条件下，两段式喷嘴引射器的引射比在蒸发温度为4℃时取得最大值；两段式喷嘴引射器制冷系统的COP随着气冷器出口温度和压力的升高而降低，随着蒸发温度的升高而升高。
분별대채용랍법이분취화량단식분취인사기적CO2과림계량상류제랭계통재불동공황、궤하척촌하진행료실험연구。실험결과표명：재고정궤하척촌조건하，기랭기출구온도화증발온도분별위43℃화6℃시，랍법이분취인사기화량단식분취인사기적인사비균수착기랭기출구압력적승고선증대후감소，분별재8．50M Pa화8．70M Pa취득최대치；량충형식분취인사기적인사비균수착기랭기출구온도적승고이승고；기랭기출구압력화온도분별위8．50M Pa화43℃조건하，량단식분취인사기적인사비재증발온도위4℃시취득최대치；량단식분취인사기제랭계통적COP수착기랭기출구온도화압력적승고이강저，수착증발온도적승고이승고。
Under different working conditions and geometrical sizes ,the experiment studies transcritical CO2 two -phase refrigeration system which respectively adopts laval -cavity nozzle and dual -throat nozzle ejec‐tor .The experimental results show that under the fixed geometrical sizes ,when the temperature of gas cooler outlet and evaporation is 43℃ and 6℃ ,the entrainment ratio of the laval nozzle ejector and the dual -throat nozzle ejector firstly increases and then decreases with the increase in the gas cooler outlet pressure ,w hich a‐chieves the maximum value when the pressure is 8 .50MPa and 8 .70MPa respectively .The entrainment ratio of the two ejectors increases with the increase in the gas cooler outlet's temperature .When the pressure and temperature of gas cooler outlet is respectively 8 .50M Pa and 43℃ ,the entrainment ratio of dual -throat noz‐zle ejector achieves the maximum value as the evaporating temperature is 4℃ .The COP of dual-throat noz‐zle ejector refrigeration system decreases with the increase in gas cooler outlet's temperature and pressure , and increases with the increase in evaporating temperature .