含硼纳米流体燃料液滴燃烧特性研究  

Investigation of Droplet Combustion Characteristics of Boron-based Nanofluid Fuels

作　　者：肖思祺 黄骞 李水清[1] XIAO Siqi;HUANG Qian;LI Shuiqing(Key Laboratory for Thermal Science and Power Engineering of Ministry of Education,Department of Energy and Power Engineering,Tsinghua University,Beijing 100084,China)

机构地区：[1]清华大学能源与动力工程系热科学与动力工程教育部重点实验室,北京100084

出　　处：《工程热物理学报》2024年第8期2524-2530,共7页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.52130606)。

摘　　要：含硼纳米流体燃料能量密度高,发展潜力大,但着火延迟、燃烧行为等基础燃烧特性研究的匮乏限制了该燃料在发动机上的实际应用。本文搭建了基于多元扩散平焰燃烧器的“飞滴法”实验平台,研究含硼(质量分数0~10%)乙醇液滴的着火及燃烧特性。发现添加硼颗粒降低了乙醇液滴的着火延迟时间,在1400 K下降幅可达约30%;添加硼颗粒会导致液滴微爆,且随温度升高,液滴微爆发生的时间更早。建立了包含纳米颗粒辐射吸收机制的单液滴燃烧模型,量化纳米颗粒辐射吸热对液滴初期燃烧速率的增幅,结果表明该机制不是纳米颗粒促进液滴燃烧的唯一主导因素。Boron-based nanofluid fuels have high energy density and great potential for develop-ment.However,due to the lack of research on basic combustion characteristics like ignition delay and combustion behavior,the practical application of this fuel in engines has been limited.In this work,we set up a falling-droplet experiment system based on a multiple diffusion flat-flame combus-tor to investigate the ignition and combustion characteristics of boron-based(mass fraction 0~10%)ethanol droplets.We found that adding 5%boron particles decreased the ignition delay time of the ethanol droplets by 34.2%at 1400 K.The addition of boron particles led to micro-explosions,which happened earlier with the temperature increase.A droplet combustion model incorporating the radiation absorption mechanism was developed to quantify the significant increase in the burning rate.By comparing the model prediction with the measurements,we clarified that radiation alone cannot fully explain the improved burning characteristics of nanofluid fuels.

关 键 词：硼 纳米流体燃料 着火延迟 微爆炸 液滴燃烧 

分 类 号：TF054[冶金工程—冶金物理化学]