喷嘴临界截面直径对喷射器性能影响实验研究  

Experimental study on the influence of nozzle critical section diameter on ejector performance

作　　者：何丽娟[1] 马文清 王飒 王淑旭 吴夏梦 张磊 肖卓楠[1] 顾洁[1] HE Lijuan;MA Wenqing;WANG Sa;WANG Shuxu;WU Xiameng;ZHANG Lei;XIAO Zhuonan;GU Jie(School of Energy and Environment,Inner Mongolia University of Science and Technology,Baotou 014010,China)

机构地区：[1]内蒙古科技大学能源与环境学院,内蒙古包头014010

出　　处：《热科学与技术》2020年第3期247-253,共7页Journal of Thermal Science and Technology

基　　金：国家自然科学基金资助项目(51566014,51106068);内蒙古留学人员科技活动项目择优入选资助项目。

摘　　要：依据索科洛夫等学者提出的经验公式对喷射器进行优化设计,搭建了用于测量喷射器性能的实验台,以CO2为工质,分别研究当工作流体压力在8.0~9.6 MPa、引射流体压力在2.4~2.8 MPa以及工作流体温度在70~90℃时,喷嘴临界截面直径对喷射系数的变化规律。实验结果表明:当喷射器背压为3.9 MPa、工作流体温度为90℃、引射流体压力为2.4 MPa、工作流体压力在8.0~9.6 MPa时,喷射器的喷射系数随喷嘴临界截面直径的增大而减小;当喷射器背压为3.9 MPa、工作流体温度为90℃、工作流体压力为10.0 MPa、引射流体压力在2.4~2.8 MPa时,喷射器的喷射系数也随喷嘴临界截面直径的增大而减小;且喷射系数理论值与实验值吻合度较好,误差在±3.75%范围内。当喷射器工作流体压力为10.0 MPa、引射流体压力为2.7 MPa、喷射器背压为3.9 MPa、工作流体温度在70~90℃时,喷射系数随着喷嘴临界截面直径的增大而逐渐减小。另外,在保持喷射器的基本工作参数不变时,工作流体压力及引射流体压力的提高对喷射器喷射系数均有提升作用。According to the empirical formula proposed by Sokolov and other scholars,the ejector was optimized and a test bench for measuring the performance of the ejector was built.Taking CO2 as the working fluid,the change of the critical section diameter of the nozzle to the ejection coefficient was studied when the working fluid pressure varied from 8.0 to 9.6 MPa,the ejector fluid pressure varied from 2.4 to 2.8 MPa,and the working fluid temperature varied from 70 to 90℃.The experimental results show that when the ejector back pressure is 3.9 MPa,the working fluid temperature is 90℃,the ejector fluid pressure is 2.4 MPa,and the working fluid pressure is in the range of 8.0-9.6 MPa,the ejection coefficient falls withthe critical section of the nozzle rise.And the same trend is obtained when the ejector back pressure is 3.9 MPa,the working fluid temperature is 90℃,the working fluid pressure is 10 MPa,and the ejector fluid pressure is in the range of 2.4 to 2.8 MPa.The theoretical value of the ejection coefficient agrees well with the experimental value,and the error is within the range of±3.75%.When the ejector working fluid pressure is 10.0 MPa,the ejector fluid pressure is 2.7 MPa,the ejector back pressure is 3.9 MPa,and the working fluid temperature is in the range of 70-90℃,the ejection coefficient increases with the critical section diameter of the nozzle slowly shrinking.In addition,when the basic working parameters of the ejector are kept unchanged,the increase of the working fluid pressure and the ejector fluid pressure can improve the ejection coefficient of the ejector.

关 键 词：二氧化碳 喷嘴临界截面直径 喷射器 喷射系数 实验研究 

分 类 号：TB619[一般工业技术—制冷工程]