| 摘要:采用CFD软件,基于欧拉法和拉格朗日离散法分别模拟喷油器内部流动及喷射特性，并将喷射计算结果导入燃烧模型实现联合仿真。仿真计算不同喷孔形式的喷射特性,得到了其内部速度、压力、气相体积分数(空穴)及喷雾场。仿真结果表明:在相同轨压下,小孔径喷孔油滴速度较大、贯穿距长、喷雾锥角小；燃烧湍流动能大，且较多soot打在气缸盖上，影响柴油机的可靠性。 |
| 关键词: 柴油机 喷孔 喷雾 燃烧 |
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| Effect of Different Types of Nozzles of Common-Rail Diesels on FuelInjection Spray and Combustion Characteristics |
| Wang Zhilei,Liu Wenbin,Wu Yalong,Song Yang |
| Henan Diesel Engine Industry Co., Ltd.,Henan Luoyang 471039 |
| Abstract:The CFD software was used to simulate the inner flow and spray characteristics of injectors with Euler and Lagrange method, and the injection simulation results were input to the combustion model to realize co-simulation. The injection characteristics of varied types of nozzles were simulated to get the internal velocity, pressure, gas phase volume fraction (cavitation) and spray field. The simulation results show that under the same common rail pressure, the nozzles with small orifice produces high fuel drop velocity, long penetration distance and small spray angle, and causes big combustion turbulence kinetic energy,thus more soot particles hit the cylinder head, which has a bad influence on the reliability of diesel engines. |
| Key words: diesel engine nozzle spray combustion |
