在自行研制的跨临界CO2热泵热水器实验台上,通过调节系统中阀门开度控制喷射器的进出口压力和温度,研究喷射器的流量、喷射系数、压缩比和效率的变化规律。实验结果表明:同时增大工作流体压力和引射流体压力可以提高喷射器的工作性能,减小工作流体压力或者增大引射流体压力可以提高喷射器的工作完善度。高效率喷射器的研制是优化跨临界CO2热泵系统的关键要素。 On the self-developed transcritical CO2 heat pump water heater experimental bench, the inlet and outlet pressure and temperature of the ejector are controlled by adjusting the valve opening in the system to study the variation of ejector flow rate, injection coefficient, compression ratio and efficiency. The experimental results show that the working performance of the ejector can be improved by increasing the pressure of the working fluid and the pressure of the ejecting fluid. The working performance of the ejector can be improved by reducing the pressure of the working fluid or increasing the pressure of the ejecting fluid. The development of high-efficiency injectors is a key element in optimizing transcritical CO2 heat pump systems.