HCB混合燃料喷雾燃烧特性

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《内燃机学报》[ISSN:1006-6977/CN:61-1281/TN]

Title:: Spray and Combustion Characteristics of Ternary Blends with Methanol，HCB and n-Octanol

作者:: 玄铁民; 孙中成; 米永刚; 2; 钟汶君; 何志霞; 王谦; 1. 江苏大学能源与动力工程学院，江苏镇江 212013；2. 江苏大学能源研究院，江苏镇江 212013

Author(s):: Xuan Tiemin; Sun Zhongcheng; Mi Yonggang; Zhong Wenjun; He Zhixia; Wang Qian; 1. School of Energy and Power Engineering，Jiangsu University，Zhenjiang 212013，China； 2. Institute for Energy Research，Jiangsu University，Zhenjiang 212013，China

Keywords:: methanol; n-octanol; hydrogenation catalytic biodiesel(HCB); ignition delay; lift-off length; liquid length

摘要:: 基于定容燃烧弹系统，通过纹影法、OH*化学荧光法与背景光消光法及自然辐射光法两套同步光学诊断技术，针对3种不同甲醇添加比例的甲醇/正辛醇/加氢催化生物柴油(HCB)混合燃油，对比分析了不同环境温度、喷射压力下喷雾燃烧特性．结果表明：3种燃油由于反应活性和含氧量的不同，在相同工况下着火延迟期和火焰浮起长度随甲醇比例的增大而增加，使得着火后的喷雾贯穿速度降低．通过对着火延迟期和火焰浮起长度经验公式的拟合，发现混合燃油的着火延迟期、火焰浮起长度与化学当量比的燃油混合分数呈正相关，而火焰浮起长度与燃油的十六烷值呈负相关．所有燃油的火焰浮起长度均小于液相长度，整个燃烧过程中均处于火包油状态，这使得燃烧促进了液相燃油的蒸发，导致着火后液相长度更短．纯生物柴油由于较短的火焰浮起长度和较高的反应活性，其燃烧导致的液相蒸发最为明显．

Abstract:: In order to study the effects of different methanol addition ratio on spray and combustion characteristics of ternary blends with methanol，n-octanol and hydrogenation catalytic biodiesel(HCB)，a single-hole nozzle spray was measured within a high-pressure high-temperature constant volume combustion chamber by means of multiple kinds of optical diagnostics，namely high-speed schlieren imaging and OH* chemiluminescence，diffused background-illumination extinction imaging and natural luminosity imaging. The results show that the ignition delay and lift-off length increase with the higher methanol addition ratio，while the spray penetrates more slowly with more metha-nol blending. After a correlation analysis，it can be concluded that ignition delay and lift-off length increase with higher Zst，but Zst effects on lift-off length are much less important than that of cetane number. A higher cetane number leads to a shorter lift-off length. Because lift-off length is shorter than liquid length for all fuels under all operating points，the liquid fuel evaporation is enhanced，leading to a shorter liquid length after ignition. The pure HCB presents the most noticeable reduction on liquid length.

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更新日期/Last Update: 2022-05-25