周昕毅，李铁，赖哲渊，王斌.柴油机非蒸发喷雾相似性研究[J].内燃机工程,2018,39(5):1-7.
柴油机非蒸发喷雾相似性研究
Study on Similarity of Non-Evaporating Diesel Spray
DOI：10.13949/j.cnki.nrjgc.2018.05.001
关键词:柴油机  相似理论  喷油速率  非蒸发喷雾
Key Words:diesel engine  similarity theory  injection rate  non-evaporating spray
基金项目:国家自然科学基金项目(91541104,51776125)
作者单位
周昕毅，李铁，赖哲渊，王斌 1.上海交通大学 海洋工程国家重点实验室，上海 200240； 2.高新船舶与深海开发装备协同创新中心，上海 200240 
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摘要:基于3种单值条件燃烧相似性规则，阐明了柴油机喷雾混合气形成过程相似性的理论依据。采用Bosch长管法和高速阴影法，试验研究了两款不同喷孔直径喷油器的喷油速率与非蒸发喷雾混合气形成过程的相似性。试验结果显示，基于3种单值条件相似规则的正规化喷油速率和喷雾贯穿距都可以相似，维持喷射压力相同的压力规则的喷雾锥角相似程度最高。当采用减小喷射压力的单值条件相似规则时，会导致小喷孔喷雾锥角和过量空气系数减小。
Abstract:Based on the three combustion similarity rules for the single value condition, the existence of similarity was theoretically explored in spray mixture formation processes. The Bosch long tube method and high-speed shadowgraphy were employed to investigate the similarity of diesel injection rate and non-evaporating spray characteristics respectively with two different size diesel nozzles. The results show that the normalized spray penetration distance and injection rate can be well scaled for all the three rules, while the similarity rule that keeps the injection pressure constant is more preferable for scaling the spray angle. The other two similarity rules, which decrease the injection pressure, will result in smaller spray angle and lower excess air ratio.
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