水润滑单螺杆空气压缩机喷水雾化的理论分析及仿真  

Theoretical Analysis and Simulation on Water Injection Atomization of Water-lubricated Single Screw Compressor

作　　者：李亚南[1,2] 王景甫 吴玉庭[1,2] 雷标[1,2] 沈丽丽[1,2] 冯玲玲 LI Yanan;WANG Jingfu;WU Yuting;LEI Biao;SHEN Lili;FENG Lingling(Faculty of Environment and Life,Beijing University of Technology,Beijing 100124,China;MOE Key Laboratory of Enhanced Heat Transfer and Energy Conservation,Beijing University of Technology,Beijing 100124,China;CRRC Tangshan Locomotive&Rolling Stock Co.,Ltd.,Tangshan 064000,Hebei,China)

机构地区：[1]北京工业大学环境与生命学部,北京100124 [2]北京工业大学传热强化与过程节能教育部重点实验室,北京100124 [3]中车唐山机车车辆有限公司,河北唐山064000

出　　处：《北京工业大学学报》2022年第5期552-560,共9页Journal of Beijing University of Technology

基　　金：北京市自然科学基金资助项目(3181001)。

摘　　要：水润滑单螺杆空气压缩机依靠向工作腔内喷水进行润滑和密封.建立了喷水单螺杆空气压缩机工作过程的热力学模型.通过模型研究了喷水孔直径以及转速对压缩机性能的影响,并且引入韦伯数对雾化效果进行评价和分析.结果表明,增大喷水孔直径可以增大喷水量,有利于降低排气温度,使压缩机的工作过程趋于等温压缩.在额定工况下,喷水孔直径从5 mm增加到7 mm,排气温度降低了40.4 K,容积效率提高了3.99%,绝热效率提高了7.57%.随着转速的升高,压缩机的效率升高,但是由于水气比的减小,影响了换热量和密封作用,因此提高转速对效率的提升作用逐渐变弱.随着喷水孔直径的增大,雾化后的液滴平均直径增大.同时,根据韦伯数可以确定不同喷水孔直径对应的最小喷水量.Water-lubricated single screw air compressor is lubricated and sealed by injecting water into the working chamber. A mathematical model of the working process of a water-lubricated single-screw air compressor was established in this study. The influences of the diameter of the water injection aperture and rotation speed on compressor performance was analyzed through the model. Weber number was introduced to evaluate and analyze the atomization effect. Results show that the discharge temperature is effectively reduced by increasing the diameter of the water injection aperture, resulting in the compression process of the compressor moving towards an isothermal state. Under rated conditions, the increase in the diameter of the water injection aperture from 5 mm to 7 mm reduced the discharge temperature of the compressor, improved the volume efficiency, and the adiabatic efficiency by 40.4 K, 3.99%, and 7.57%, respectively. Although the increase in rotation improved the efficiency of the compressor, there was a decrease in the cooling and sealing effect due to a reduction in the water-air ratio. Therefore, the impact of an increase in speed on the efficiency of the compressor was gradually weakened. With the increase of the diameter of the water injection aperture, the average diameter of atomized droplet increased. The minimum water flow rate corresponding to different water injection apertures was determined according to Weber number.

关 键 词：水润滑 单螺杆空气压缩机 雾化 热力性能 喷水参数 换热 

分 类 号：TH455[机械工程—机械制造及自动化]