喷水涡旋空气压缩机工作特性的研究

Performance Study of Water-Injection Scroll Air Compressor

从变质量系统热力学原理出发,考虑喷水涡旋空气压缩机的换热及工作特点,建立了其热力学模型.通过对喷水涡旋压缩机工作过程的模拟,分析了转速、喷水量、功率、排气温度等参数之间的关系.模拟计算及实验结果表明:当喷水量为60kg/h,排气压力为0 2MPa时,涡旋压缩机的实际功率接近于等温功率,并且随着转速的提高逐渐偏离等温功率;容积效率随着转速的提高而增大,在转速小于3000r/min的范围内,转速对涡旋压缩机的容积效率影响较大;排气温度随着喷水量的增大而降低,与绝热过程相比,在压比为2 0时,排气温度的降低大于40K;喷水引起的额外耗功比压缩机的指示功率小3%.

By considering the characters of the water-injection scroll compressor, a thermodynamic model of the water-injection scroll air compressor was developed using the conversations of energy and mass equations and the equations of the state. On basis of this model, the simulated results were analyzed with focus on the relationship of the rotation speed, water mass flow rate, power consumption, and discharge temperature. It is indicated by calculation and experiments that the tested compressor power approaches the isothermal power under the condition studied. The volumetric efficiency increases with the increase of the compressor speed. But the influence of the speed on the volumetric efficiency decreases when the speed is higher than 3000 r/min. The discharge temperature decreases as the water mass flow rate increases. Compared with adiabatic process, the discharge temperature reduces more than 40 K under the designed pressure ratio. The power caused by the water injection is less than 3% of the compressor indicated power.