正丁醇+正庚烷二元系的音速和过量等熵压缩率  

Speed of Sound and Excess Isentropic Compressibility of n-Butanol+n-Heptane Binary Mixtures

作　　者：张恒飞 占涛涛 何茂刚[1] 张颖[1] ZHANG Hengfei;ZHAN Taotao;HE Maogang;ZHANG Ying(Key Laboratory of Thermal-Fluid Science and Engineering of MOE,Xi'an Jiaotong University,Xi'an 710049,China)

机构地区：[1]西安交通大学热流科学与工程教育部重点实验室,西安710049

出　　处：《工程热物理学报》2023年第4期857-862,共6页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.51721004)。

摘　　要：正丁醇是潜在的新一代主流替代燃料。音速、密度等热物性参数对于燃料的喷射、雾化、燃烧具有重大影响,但目前相关研究还较为缺乏。本文以正丁醇+正庚烷混合物代替含醇燃料,利用瑞利–布里渊散射法,测量了其在温度298.15~433.15K和压力0.1、5.0 MPa下的音速。结合文献密度数据计算了混合物的等熵压缩率κs和过量等熵压缩率κsE。结果表明,混合物的音速随着正丁醇摩尔分数的增加而增加,而κsE先增大后减小至负值,再增大。从分子间相互作用的角度进行了分析,并为该混合燃料的应用提供了参考建议。n-Butanol is expected to be the next generation alternative fuel.Thermal physical parameters such as speed of sound and density have great influence on fuel injection,atomization and combustion,however the relevant research is still lacking.In this work,the Rayleigh-Brillouin scattering method was applied to measure the speed of sound of n-butanol+n-heptane binary mixtures at 298.15~433.15 K under 0.1 and 5.0 MPa,as the fuel containing n-butanol.The isentropic compressibility(s)and excess isentropic compressibility(rE)were calculated combined with density data from literatures.The results show that the speed of sound increases as the n-butanol molar fraction increases,while kF increases first,then decreases to negative values,and increases again.The intermolecular interactions are analyzed,moreover several suggestions are provided for this mixed fuel application.

关 键 词：音速 瑞利–布里渊散射 等熵压缩率 过量性质 

分 类 号：TK121[动力工程及工程热物理—工程热物理]