喷油策略对伞喷柴油机工作过程影响的数值模拟研究  

Numerical Simulation of Conical Spray on Diesel Engine with Various Injection Strategies

作　　者：冯圆[1] 帅石金[1] 王志[1] 安新亮[1] 王建昕[1] 侯德洋 李剑钊 

机构地区：[1]清华大学汽车安全与节能国家重点实验室,北京100084 [2]大连数通技术有限公司,辽宁大连116025

出　　处：《内燃机学报》2007年第4期304-310,共7页Transactions of Csice

基　　金：清华大学基础研究基金(JCPY2005051)

摘　　要：对一种新型柴油机喷嘴进行了可视化试验与模拟计算。应用三维CFD(Computational Fluid Dynamic)软件模拟了两种喷雾形式下不同喷油参数对柴油机混合气形成、燃烧及排放的影响,得到了最佳的喷油策略。结果表明,相对于复合喷雾,伞形喷雾在混合气形成方面存在一定的优势,对燃烧和排放有较大改善;混和气形成较好,燃烧效率高,指示油耗较低,碳烟二次氧化迅速。并且伞形喷雾中,采用小的索特平均直径,高的喷射速度,能够使发动机性能得到较大地改善。In this study, visualization experiments and simulation of a new diesel injector were carried out on a constant volume combustion bomb. Fuel-air mixture formation, combustion and emission process were simulated under two types of spray by using three-dimensional CFD package. The optimum injection strategy was achieved. Simulation results showed that, comparing to the hybrid spray, the conical spray has the advantage in the fuel-air mixture formation, and can moderately improve combustion process and emission. With the conical spray, better mixture formation, higher combustion efficiency, lower fuel consumption and soot emissions were obtained. Conical spray with small SMD and fast spray velocity can significantly improve engine performance.

关 键 词：伞喷 喷油策略 CFD 优化设计 

分 类 号：TK422[动力工程及工程热物理—动力机械及工程]