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| Analysis of evaporation characteristics for different fuel oil droplets in sub/transcritical state |
| 1. School of Automotive and Traffic Engineering，Jiangsu University, Zhenjiang，Jiangsu 212013，China；2.School of Mechanical Engineering, Henan University of Engineering, Zhengzhou, Henan 451191，China |
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Abstract The sub/transcritical state has great influence on the evaporation rules of different fuel droplets. By building a high-temperature constant-volume droplet evaporation measurement device, droplet life, droplet diameter, droplet evaporation rate and other parameters of C12H26, C14H30, diesel and biodiesel droplets in different critical states were measured. The results show that compared to the subcritical state with temperature of 573 K, when the four droplets are in the transcritical state with temperature of 973 K, the evaporation rates are increased by 1.25, 1.03, 0.71 and 0.51 mm2·s-1, respectively. The evaporation rate of single-component droplets is higher than that of multi-component droplets. The droplet lifetimes are greatly reduced by 86%, 89%, 93% and 89%, respectively. In the transcritical state, the expansion stage of biodiesel droplet evaporation is short, and the square of droplet diameter is decreased nonlinearly with time, which is not consistent with d2 law. C12H26, C14H30 and diesel droplets do not have expansion stage, and the square of droplet diameter is decreased linearly with time, which is conformed to d2 law.
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Received: 15 June 2020
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|
| ［1］ |
解茂昭.内燃机跨临界/超临界燃料喷雾混合过程的机理与模型[J].燃烧科学与技术,2014,20(1):1-9.
|
|
XIE M Z. Mechanism and modeling of transcritical/supercritical fuel spray and mixture formation in internal combustion engines [J]. Journal of Combustion Science and Technology, 2014,20(1):1-9. (in Chinese)
|
| ［2］ |
JIN X, HUANG Z X,XU L L, et al. Experimental study on spray and atomization characteristics under subcritical, transcritical and supercritical conditions of marine diesel engine[J]．Energy Conversion & Management,2019,195:958-971.
|
| ［3］ |
肖国炜,罗开红,马骁,等.超临界环境下燃料液滴蒸发的分子动力学模拟[J].工程热物理学报,2017,38(12):2745-2751.
|
|
XIAO G W, LUO K H, MA X,et al. Molecular dyna-mics simulations of the evaporation process of a fuel droplet under supercritical environment[J]. Journal of Engineering Thermophysics, 2017,38(12):2745-2751. (in Chinese)
|
| ［4］ |
HASHIMOTO N, NOMURA H, SUZUKI M, et al. Evaporation characteristics of a palm methyl ester droplet at high ambient temperatures[J]. Fuel,2015, 143:202-210.
|
| ［5］ |
SAHA K, ABU-RAMADAN E, LI X G, et al. Multicomponent evaporation model for pure and blended biodiesel droplets in high temperature convective environment[J].Applied Energy, 2012,93:71-79.
|
| ［6］ |
KIM H, WON J, BAEK S W. Evaporation of a single emulsion fuel droplet in elevated temperature and pressure conditions[J]. Fuel,2018,226:172-180.
|
| ［7］ |
王宏楠, 熊永华.超临界环境条件对碳氢燃料液滴蒸发特性的影响[J]. 内燃机学报, 2014,32(2):172-177.
|
|
WANG H N, XIONG Y H. Effect of supercritical am-bient conditions on hydrocarbon fuel droplet evaporation characteristics [J]. Transactions of CSICE, 2014,32(2):172-177. (in Chinese)
|
| ［8］ |
MATLOSZ R L，LEIPZIGER S, TORDA T P. Investigation of liquid drop evaporation in a high temperature and high pressure environment [J]. International Journal of Heat and Mass Transfer，1972，15(4)：831-846.
|
| ［9］ |
HIROYASU H，KADOTA T. Droplet evaporation in a pressurized and heated ambient gas [J]. International Journal Series B-Fluids and Thermal Engineering，1974，40(12)：3147-3155.
|
| ［10］ |
NOMURA H, TAKAHIRO T, MURAKOSHI Y, et al. Microgravity experiments of fuel droplet evaporation in sub- and supercritical environments[J].Proceedings of the Combustion Institute,2017,36(2):2425-2432.
|
| ［11］ |
李瑞娜. 甲醇/生物柴油混合燃料雾化及着火过程的研究[D].镇江：江苏大学,2016.
|
| ［12］ |
杨杰.数字图像处理及MATLAB实现 [M].2版.北京：清华大学出版社，2013.
|
| ［13］ |
徐玲,陈建军,张立明,等.负载型磷钨酸催化剂的制备、表征及酯交换制备生物柴油[J].吉林大学学报(理学版),2012,50(2):346-350.
|
|
XU L, CHEN J J, ZHANG L M,et al. Preparation,characterization of supported phosphotungstic acid catalyst and its application to transesterification to produce biodiesel [J]. Journal of Jilin University(Science Edition), 2012,50(2):346-350. (in Chinese)
|
|
|
|
2022, Vol. 43 
