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基于定容燃烧弹研究钛基MOFs(金属-有机框架)纳米颗粒在不同喷射压力下对柴油/正丁醇混合燃料喷雾和燃烧特性的影响。结果表明：添加金属有机框架NH2-MIL-125(Ti)后，柴油/正丁醇混合燃料的密度、运动黏度和表面张力减小，同时促进了喷雾的二次雾化，增大了混合燃料的液相和气液相喷雾贯穿距、喷雾锥角及喷雾面积。相较于燃料D80B20,NH2-MIL-125(Ti)的加入延缓了喷雾温度的上升，延长了油气混合时间，使得火焰浮起长度增大，滞燃期延长。燃烧持续期则随着MOFs纳米颗粒对雾化的改善和燃烧速率的提升而缩短。同时喷雾雾化的增强与NH2-MIL-125(Ti)热解生成的TiO2纳米颗粒的催化作用使得燃烧更加充分，显著降低了碳烟生成量和火焰面积。在喷射压力为140 MPa时，燃料D80B20Ti20的归一化KL因子和总自然发光强度相较于D80B20分别降低了45.9%和48.7%,且这种抑制效果随喷射压力升高而增强。
Abstract：The effects of titanium-based MOFs(metal-organic frameworks) nanoparticles on spray and combustion characteristics of diesel/n-butanol blends were investigated in a constant volume combustion chamber under varying injection pressures.The results indicate that the addition of NH2-MIL-125(Ti) reduces the density, kinematic viscosity and surface tension of the diesel/n-butanol blended fuel.The nanoparticles promote the secondary spray atomization of the spray while increasing the liquid-phase and gas-liquid phase spray penetration distance, spray cone angle and spray surface area of the mixed fuel. Compared to D80B20, the addition of NH2-MIL-125(Ti) delays the temperature rise in the spray region, prolongs the fuel-air mixing duration, and consequently increases the flame lift-off length while extending the ignition delay period.The combustion duration is shortened due to improving atomization and enhancing burning rate facilitated by the MOFs nanoparticles.Moreover, the combination of enhanced spray atomization and the catalytic effect of TiO2 nanoparticles [derived from NH2-MIL-125(Ti) pyrolysis] promotes more complete combustion, significantly reducing soot formation and flame area.At an injection pressure of 140 MPa, D80B20Ti20 exhibits 45.9% and 48.7% reductions in normalized KL factor and total natural luminosity intensity respectively compared to D80B20, with this suppression effect becoming more pronounced at higher injection pressures.
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基本信息:
中图分类号:TQ511
引用信息:
[1]包中强,吉振华,马彦磊,等.钛基金属-有机框架对柴油正丁醇混合燃料喷雾与燃烧的影响[J].化学工程,2026,54(04):13-20.
基金信息:
国家自然科学基金资助项目(22272010); 陕西省创新能力支撑计划(2021TD-28,2022KXJ-144)
2026-04-15
2026-04-15