流体质量流量及压力对喷射器关键尺寸的影响

The effect of fluid mass flow and pressure on key size of injector

针对CO2吸收式制冷系统存在吸收效率低、膨胀损失大的问题,选择使用一种带有喷射器的新型CO2喷射器吸收式制冷系统。通过模型计算研究了工作流体及引射流体的质量流量与压力对喷嘴临界截面直径和圆柱形混合室截面直径的影响。结果表明,当其他条件固定不变时,喷嘴临界截面直径Db随工作流体质量流量在0.02~0.10kg/s范围内增加时从6.2mm增加到12.3mm,随工作流体压力在0.1~0.4MPa范围内增加时从66mm减小到34mm;圆柱形混合室截面直径De随引射流体质量流量在0.02~0.10kg/s范围内增加时从63mm增加到91mm,随引射流体压力在0.0023~0.0073MPa范围内增加时从37mm增加到83mm,由此可知圆柱形混合室截面直径存在最佳值。

A new type of CO2 - injector absorptive refrigeration system with ejector was selected to solve the problems of low absorption efficiency and large expansion loss for CO2 absorption refrigeration systems. The influences of mass flow rate and pressure on the critical cross - section diameter of the nozzle and the diameter of the cylindrical mixing chamber were studied by model calculation. The results show that when the other conditions are fixed, the critical cross - sectional diameter of the nozzle increases from 6.2ram to 12.3mm when the mass flow of the working fluid increases from 0.02 -0.10kg/s, with the working fluid pressure increasing from 0.1 to O. 4MPa reduced from 66mm to 34mm in the range of increasing; the cross - sectional diameter of the cylindrical mixing chamber increases from 63mm to 91mm with the increase of the mass flow of the ejected fluid from 0：02 to 0.10kg/s, 0. 0023 -0. 0073MPa in the range increased from 37mm to 83ram, we can see that the cylindrical mixing chamber section diameter of the best value.