背景温度和密度对柴油喷雾特性影响灵敏度分析

发布时间：2018-01-27 01:39

本文关键词： 柴油喷雾特性背景温度背景密度纹影定容装置灵敏度分析　出处：《哈尔滨工程大学学报》2016年11期 　论文类型：期刊论文

【摘要】：为优化发动机缸内喷油时刻背景温度和密度,以改善喷雾特性、提高功率,通过高速摄影直拍和纹影技术,利用自编图像处理程序进行数据处理,引入灵敏度概念,研究了背景温度和密度对柴油喷雾特性影响灵敏性。试验发现:在背景温度304~770 K,密度13~26 kg/m~3范围内,背景温度对气相体积百分比的灵敏度远大于密度对气相体积百分比的灵敏度,在770 K、26 kg/m~3时,大约是密度的10倍;而密度对喷雾平均空燃比的灵敏度略大于温度对喷雾平均空燃比的灵敏度,在770 K、26 kg/m~3时,大约是温度的1.18倍。将此规律应用于发动机某工况仿真计算,微调喷油初始时刻背景温度和密度(3.5%以内变动),功率可提高2.8%。
[Abstract]:In order to optimize the background temperature and density of the fuel injection time in the cylinder to improve the spray characteristics and increase the power, the data were processed by the self-made image processing program through the techniques of high speed photography and speckle photography. Sensitivity concept was introduced to study the sensitivity of background temperature and density on diesel spray characteristics. The experimental results showed that the background temperature was 304 ~ 770K and the density was 13 ~ 26 kg/m~3. The sensitivity of background temperature to gas phase volume percentage is much higher than that of density to gas phase volume percentage. The sensitivity of density to the average air-fuel ratio is slightly higher than that of temperature to the average air-fuel ratio of the spray, and the sensitivity of the density to the average air-fuel ratio is between 270kg / m ~ 3:00. This rule is applied to the simulation calculation of engine working condition. The background temperature and density of the fuel injection are changed within 3.5% at the initial time of fine tuning, and the power can be increased by 2.8%.
【作者单位】：北京理工大学机械与车辆学院;中国北方发动机研究所(天津);
【基金】：装备预研项目(104010204)
【分类号】：TK401
【正文快照】： 网络出版地址:http://www.cnki.net/kcms/detail/23.1390.u.20160527.1354.006.html改善燃油经济性和降低排放污染是内燃机燃烧技术必须面临的两大挑战[1-3]。而燃料的雾化过程及结果直接影响到燃料的燃烧及排放等特性[4]。高温高压背景环境中的喷雾特性研究包含油束破碎、混

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