喷射策略对某重型柴油机高原燃烧特性的影响  

Influence of Injection Strategy on Plateau Combustion Characteristicsof a Heavy-duty Diesel Engine

作　　者：曹佳斌 苏石川[1] 臧瑞斌 周柳均 李毅 CAO Jia-bin;SU Shi-chuan;ZANG Rui-bin;ZHOU Liu-jun;LI Yi(School of Energy and Power Engineering,Jiangsu University of Science and Technology,Zhenjiang 212003,China;Changzhou FRP Boatbuilding Co.,Ltd.,Changzhou 213127,China;China National Heavy-Duty Truck Group Hangzhou Engine Sales Co.,Ltd.,Hangzhou 311215,China)

机构地区：[1]江苏科技大学能源与动力工程学院,镇江212003 [2]常州玻璃钢造船厂有限公司,常州213127 [3]中国重汽集团杭州发动机有限公司,杭州311215

出　　处：《科学技术与工程》2020年第17期6878-6885,共8页Science Technology and Engineering

基　　金：军队预研项目(30110030402)。

摘　　要：为研究高原条件下不同喷射策略对某重型柴油机燃烧特性的影响。建立基于ECFM-3Z燃烧模型的某增压柴油机燃烧室三维模型并将其与平原台架试验结果进行对比验证,分析在海拔4550 m条件下不同喷射策略对柴油机缸内燃烧过程的影响。结果表明,随着喷油提前角增大,单次喷射时缸内高温区域缩小,温度分布变得均匀,缸内预混合燃烧增强。和平原条件下的结果相比,喷油提前角的增大可以减少碳烟的排放但是增加了NO x的排放。采用多次喷射策略时,预喷的提前可以使燃油与空气混合更充分,从而有助于主喷燃油更好地燃烧,功率能够得到进一步提升,较单次喷射NO x排放增加,碳烟排放减少。根据模拟结果最终选择预喷提前角为22°CA BTDC和主喷提前角为2°CA BTDC的喷射策略,示功图面积较单次喷射相比有所提高,可恢复至平原的85.6%。In order to research the influence of different injection strategies on the performance of heavy-duty diesel engines under high altitude conditions,a three-dimensional model of a supercharged diesel engine chamber model was established and verified based on the ECFM-3Z combustion model.And the effects of different injection strategies on the in-cylinder combustion process at the altitude of 4550 m were analyzed based on the verification of the plain bench test.The simulation results show that as the injection advance angle increases,the high temperature region in the cylinder of a single injection shrinks.The temperature distribution becomes uniform,and the premixed combustion in the cylinder is enhanced.An increase in the fuel injection advance angle can reduce soot emissions but increase NO x emissions compared to the results under plain conditions.When using the multiple injection strategy,the advance of the pre-injection can make the fuel and air more fully mixed,which helps the main injection fuel to burn better,the power can be further improved,but the average temperature inside the cylinder rises.However,due to the increase in the average internal temperature of the cylinder,the NO x emissions are increased compared with the single injection,and carbon smoke emissions are reduced.According to the simulation results,the injection strategy with the pre-ejection advance angle of 22°CA BTDC and the main spray advance angle of 2°CA BTDC is finally selected.The area of the indicator diagram is improved compared with the single injection,which can be restored to 85.6%of the plain.

关 键 词：喷射策略 高原 重型柴油机 数值模拟 性能恢复 

分 类 号：TK421.2[动力工程及工程热物理—动力机械及工程]