壁面温度对柴油喷雾碰壁质量分布的影响
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摘要
基于AVLFIRE软件建立柴油喷雾及碰壁仿真计算模型,以定容燃烧弹中喷雾碰壁试验得出的数据为基础对模型进行标定与校核,然后对不同壁面温度条件下的喷雾碰壁特性进行仿真计算,得出了不同壁面温度时燃油的气相、液相和附壁油膜质量随时间的变化规律.结果表明:喷雾碰壁之前,液相质量随时间的增加而增加,碰壁之后,液相质量随时间的增加而减少;壁面温度对空间液相质量的分布及其随时间的变化规律影响不大;随着壁面温度升高,喷油结束之前气相质量随时间增加的速率稍有增加,而喷油结束之后气相质量随时间增加的速率明显增加,附壁油膜达到最大质量的变化速率降低,达到最大质量后,附壁油膜随时间减小的速率增加.
A diesel spray-wall impingement model was established by using AVL FIRE software. The model was calibrated and checked on the basis of experimental data obtained by a spray-wall impingement test in a constant volume combustion vessel. The spray-wall impingement characteristics were simulated for different wall temperatures. The mass distribution of vapor-and liquid-phase and the oil film attached on the wall as the time proceeds were studied for different wall temperatures. The results show that before the wall impingement,the mass of the liquid-phase increases as the time proceeds,while it decreases after the wall impingement. Wall temperature has little effect on the distribution of the liquid-phase and its change with the time. As the temperature of the wall surface increases,the rate of increase in the vapor-phase mass is improved slightly as the time proceeds before the end of injection,and it is improved significantly after the end of injection. The rate of increase in the mass of the oil film attached on the wall decreases before reaching the maximum mass,and the rate of decrease is improved after reaching the maximum mass.
A diesel spray-wall impingement model was established by using AVL FIRE software. The model was calibrated and checked on the basis of experimental data obtained by a spray-wall impingement test in a constant volume combustion vessel. The spray-wall impingement characteristics were simulated for different wall temperatures. The mass distribution of vapor-and liquid-phase and the oil film attached on the wall as the time proceeds were studied for different wall temperatures. The results show that before the wall impingement,the mass of the liquid-phase increases as the time proceeds,while it decreases after the wall impingement. Wall temperature has little effect on the distribution of the liquid-phase and its change with the time. As the temperature of the wall surface increases,the rate of increase in the vapor-phase mass is improved slightly as the time proceeds before the end of injection,and it is improved significantly after the end of injection. The rate of increase in the mass of the oil film attached on the wall decreases before reaching the maximum mass,and the rate of decrease is improved after reaching the maximum mass.
引文
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[22]O'Rourke P J,Amsden A A.A spray/wall interaction submodel for the KIVA-3 wall film model[C]//SAE Paper.Detroit,Michigan,USA,2000,2000-01-0271.
[2]王站成,杜慧勇,刘建新,等.共轨条件下的柴油机燃油喷雾碰壁试验研究[J].农机化研究,2012,34(7):228-231.
[3]Ismael M A,Heikal M R,Baharom M B.Spray-wall impingement of diesel-CNG dual fuel jet using schlieren imaging technique[C]//EDP Sciences.Kuala Lumpur,Malaysia,2014,2014-1302037.
[4]丰雷,陈贝凌,马天宇,等.柴油喷雾撞壁形态和油束发展特征[J].内燃机学报,2018,36(1):68-75.
[5]何志霞,张鑫,陶希成,等.燃油温度对柴油喷射过程影响的试验[J].内燃机学报,2017,35(5):399-405.
[6]Zhu J,Kuti O A,Nishida K.An investigation of the effects of fuel injection pressure,ambient gas density and nozzle hole diameter on surrounding gas flow of a single diesel spray by the laser-induced fluorescenceparticle image velocimetry technique[J].International Journal of Engine Research,2013,14(6):630-645.
[7]黄豪中,安彦召,苏万华,等.喷射压力和喷孔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.
[8]Pickett L M,Siebers D L.Soot in diesel fuel jets:Effects of ambient temperature,ambient density,and injection pressure[J].Combustion and Flame,2004,138(1):114-135.
[9]钱耀义,李云清,于秀敏,等.小型直喷式柴油机喷雾特性的试验研究[J].内燃机学报,2001,19(2):97-101.
[10]成晓北,黄荣华,邓元望,等.柴油机喷雾撞壁的研究[J].车用发动机,2001,6:1-7.
[11]Montorsi L,Magnusson A,Andersson S,et al.Numerical and experimental analysis of the wall film thickness for diesel fuel sprays impinging on a temperaturecontrolled wall[C]//SAE Paper.Detroit,Michigan,USA,2007,2007-01-0486.
[12]Leonard K L S,Tien C H,Wei L C.The study of spray impingement on a heated metal plate inside a low-speed wind tunnel[J].Journal of the Chinese Institute of Engineers,2011,34(3):357-366.
[13]Montanaro A,Allocca L,Meccariello G,et al.Schlieren and mie scattering imaging system to evaluate liquid and vapor contours of a gasoline spray impacting on a heated wall[C]//International Conference on Engines&Vehicles.Capri,Italy,2015,2015-24-2473.
[14]Montanaro A,Allocca L,Lazzaro M,et al.Impinging jets of fuel on a heated surface:Effects of wall temperature and injection conditions[C]//SAE Paper.Detroit,Michigan,USA,2016,2016-01-0863.
[15]高光海,胡宗杰,邓俊,等.壁面热条件对撞壁油束发展影响的试验研究[J].内燃机工程,2007,28(5):15-18.
[16]李韬,邓康耀,程永胜.壁面温度对喷射油膜附壁厚度的影响[J].内燃机工程,2010,31(3):67-70.
[17]Soid S N,Zainal Z A.Spray and combustion characterization for internal combustion engines using optical measuring techniques-A review[J].Energy,2011,36(2):724-741.
[18]Payri R,Gimeno J,Viera J P,et al.Needle lift profile influence on the vapor phase penetration for a prototype diesel direct acting piezoelectric injector[J].Fuel,2013,113:257-265.
[19]Ayri R,Gimeno J,Bardi M,et al.Study liquid length penetration results obtained with a direct acting piezo electric injector[J].Applied Energy,2013,106:152-162.
[20]Gao H,Li X,Xue J,et al.A modification to the WAVE breakup model for evaporating diesel spray[J].Applied Thermal Engineering,2016,108:555-566.
[21]孙柏刚.柴油机喷雾燃烧仿真与参数匹配研究[D].北京:北京理工大学机械与车辆学院,2006.
[22]O'Rourke P J,Amsden A A.A spray/wall interaction submodel for the KIVA-3 wall film model[C]//SAE Paper.Detroit,Michigan,USA,2000,2000-01-0271.