【摘要】 考虑到实际气体在喷射器内流动的复杂多变性，文章基于CO₂实际气体的热物性，在临界圆模型的基础上，修正工作流体在临界圆处的速度分布，构建制冷系统中喷射器内部气体流动特性的喷射系数计算模型。基于实际气体改进的临界圆模型相较于传统的一维喷射器模型和临界圆模型更加精确，高压工况下误差波动小且更为稳定；在工作流体压力为7.460、7.475、7.555、7.710、7.760 MPa时，喷射系数理论计算数值分别为0.366 7、0.387 2、0.390 5、0.350 8、0.371 5,与实验数值的相对误差分别为6.1%、7.4%、8.3%、9.6%、9.2%,验证了该模型具有一定的可信度。更多还原

【Abstract】 Considering the complexity and variability of the actual gas flowing in the ejector, based on the thermophysical properties of the actual CO₂ gas and the critical circle model, this paper corrects the velocity distribution of the working fluid at the critical circle, constructing the calculation model of the ejection coefficient of gas flow characteristics inside the ejector in the refrigeration system. Compared with the traditional one-dimensional ejector model and critical circle model, the improved critical circle model based on actual gas is more accurate, and the error fluctuation is smaller and more stable under high pressure conditions. When the working fluid pressure is 7.460 MPa, 7.475 MPa, 7.555 MPa, 7.710 MPa, and 7.760 MPa, the theoretical calculation values of the ejection coefficients are 0.366 7, 0.387 2, 0.390 5, 0.350 8, 0.371 5, respectively, and the relative errors with the experimental values are 6.1%, 7.4%, 8.3%, 9.6%, and 9.2%, respectively, verifying that the model has a certain degree of credibility.更多还原