喷孔直径对戊醇/柴油混合燃料喷雾特性的影响
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摘要
为了寻找清洁高效的柴油代用燃料,有效解决目前出现的能源危机和环境恶化的问题,在高压可视化定容弹试验台上利用高速摄影技术来研究柴油/戊醇混合燃料的宏观喷雾特性,分析了喷孔直径和燃料物性的改变对喷雾宏观参数的影响。结果表明,随着添加戊醇体积比的增加,混合燃料的粘度降低,喷雾贯穿距离减小,而喷雾平均锥角、喷雾相对面积和喷雾体积均有不同程度的增加,说明添加一定比例的戊醇能改善燃料的雾化特性;喷孔直径从0.10 mm增大至0.18 mm,混合燃料的喷雾锥角和贯穿距离的平均增幅分别为24.7%和28.0%,喷雾相对面积、喷雾体积均有大幅度增加。
The current energy crisis and environmental degradation could be effectively solved by a clean and efficient alternative diesel fuel. The macro spray characteristics of diesel/pentanol fuel were studied by high speed photography of the high pressure visualization constant volume bomb test rig. The effects of injection hole diameter and fuel physical property on the macro spray parameters were analyzed. The results show that the spray penetration distance decreases,and the spray mean cone angle,spray relative area and spray volume increases in varying degrees by increasing the volume ratio of pentanol,the viscosity of the fuel mixture. It shows that adding a certain proportion of pentanol can improve the atomization characteristics of fuel. The orifice diameter increased from0. 10 mm to 0. 18 mm,the average increase amplitude of the spray cone angle and penetration distance of the mixed fuel was 24. 7% and 28. 0%,respectively,and the spray relative area andspray volume increased significantly.
The current energy crisis and environmental degradation could be effectively solved by a clean and efficient alternative diesel fuel. The macro spray characteristics of diesel/pentanol fuel were studied by high speed photography of the high pressure visualization constant volume bomb test rig. The effects of injection hole diameter and fuel physical property on the macro spray parameters were analyzed. The results show that the spray penetration distance decreases,and the spray mean cone angle,spray relative area and spray volume increases in varying degrees by increasing the volume ratio of pentanol,the viscosity of the fuel mixture. It shows that adding a certain proportion of pentanol can improve the atomization characteristics of fuel. The orifice diameter increased from0. 10 mm to 0. 18 mm,the average increase amplitude of the spray cone angle and penetration distance of the mixed fuel was 24. 7% and 28. 0%,respectively,and the spray relative area andspray volume increased significantly.
引文
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[11]安彦召,黄豪中,苏万华,等.燃油属性和环境密度对柴油机混合燃料喷雾的影响[J].内燃机学报,2013,31(2):103-108.
[12]NABER J D,SIEBERS D L.Effects of gas density and vaporization on penetration and dispersion of diesel sprays[J].Sae Technical Papers,1996,105(3):82-111.
[13]DELACOURT E,DESMET B,BESSON B.Characterisation of very high pressure diesel sprays using digital imaging techniques[J].Fuel,2005,84(7-8):859-867.
[14]SOU A,HOSOKAWA S,TOMIYAMA A.Effects of cavitation in a nozzle on liquid jet atomization[J].International Journal of Heat&Mass Transfer,2007,50(17-18):3575-3582.
[2]LABECKAS G,SLAVINSKAS S,MAZEIKA M.The effect of ethanol-diesel-biodiesel blends on combustion,performance and emissions of a direct injection diesel engine[J].Energy Conversion&Management,2014,79(2):698-720.
[3]LIU H F,LI S J,ZHENG Z Q,et al.Effects of n-butanol,2-butanol,and methyl octynoate addition to diesel fuel on combustion and emissions over a wide range of exhaust gas recirculation(EGR)rates[J].Applied Energy,2013,112:246-256.
[4]IMDADUL H K,RASHED M M,SHAHIN M M,et al.Quality improvement of biodiesel blends using different promising fuel additives to reduce fuel consumption and NO emission from CI engine[J].Energy Conversion&Management,2017,138:327-337.
[5]WEI L,CHEUNG C S,HUANG Z.Effect of n-pentanol addition on the combustion,performance andemission characteristics of a direct-injection diesel engine[J].Energy,2014,70(1):172-180.
[6]KUMAR B R,SARAVANAN S.Effect of exhaust gas recirculation(EGR)on performance and emissions of a constant speed DI diesel engine fueled with pentanol/diesel blends[J].Fuel,2015,160:217-226.
[7]LI L,WANG J,WANG Z,et al.Combustion and emissions of compression ignition in a direct injection diesel engine fueled with pentanol[J].Energy,2015,80:575-581.
[8]NGUYEN D N,ISHIDA H,MASAHIRO S.Ignition and combustion characteristics of gas-to liquid fuels for different ambient pressures[J].Energy Fuels,2010,24:365-374..
[9]黄豪中,安彦召,苏万华,等.喷射压力和喷射直径对柴油机混合燃料喷雾特性的影响[J].内燃机学报,2013,31(3):200-207.
[10]邓家骏,贾和坤,王佳,等.喷雾锥角及燃烧室对柴油机预混合低温燃烧的影响[J].广西大学学报(自然科学版),2017,42(3):913-920.
[11]安彦召,黄豪中,苏万华,等.燃油属性和环境密度对柴油机混合燃料喷雾的影响[J].内燃机学报,2013,31(2):103-108.
[12]NABER J D,SIEBERS D L.Effects of gas density and vaporization on penetration and dispersion of diesel sprays[J].Sae Technical Papers,1996,105(3):82-111.
[13]DELACOURT E,DESMET B,BESSON B.Characterisation of very high pressure diesel sprays using digital imaging techniques[J].Fuel,2005,84(7-8):859-867.
[14]SOU A,HOSOKAWA S,TOMIYAMA A.Effects of cavitation in a nozzle on liquid jet atomization[J].International Journal of Heat&Mass Transfer,2007,50(17-18):3575-3582.