摘要
为适应国六排放法规对PN颗粒数的严格要求,国内各大主机厂已经开展满足国六排放要求的发动机开发项目,高轨压35 MPa喷油器应用作为改善缸内燃烧的有效手段被广泛应用,主要介绍了35 MPa高轨压喷油器在发动机性能开发阶段的匹配与试验研究。在模拟仿真部分,提出了一种简单的喷油器喷雾标定方法,通过试验对比喷油器雾化程度和贯穿距离吻合度较高,缸内流动计算分别对滚流比、湍动能和混合气浓度等影响着火的主要因素进行分析,初步判断不同喷油器的匹配结果。发动机台架试验表明,燃油喷射压力提高对高效燃烧区域油耗的改善并不明显,而PN的排放由于喷油压力的提高而降低,另一方面喷油器的喷射方向对PN排放的影响较大,角度分散或角度集中布置均不利于PN排放,同时燃油喷射压力提高对改善常用工况点机油稀释程度也有促进作用,试验结果对喷油器设计具有指导意义。
In order to meet the strict requirements of the CN6 emission regulations on the number of PN particles,more and more domestic OEMs have developed new engine projects.High-rail pressure injectors with 35 MPa inject pressure are widely used as an effective method to improve the combustion state in the cylinders.This paper introduces the matching process and experimental research of high-rail pressure injectors with the pressure of 35 MPa during the engine performance development stage.In the simulation part,a simple inject spray calibration method is proposed.The spray atomization degree and the penetration distance match the test result well.The main factors affecting the ignition point,such as the tumble ratio,the turbulent energy and the mixture concentration,are analyzed by in-cylinder flow calculation to determine the matching results of different injectors.The engine test bench shows that the improvement of fuel consumption in the high efficiency combustion area is not obvious with the increase of the fuel injection pressure,while the PN emission is reduced.On the other hand,the injection direction of the injector has a greater impact on the PN emissions.Both the angular dispersion and concentration layout are not conducive to reducing PN emissions.At the same time,the increase of fuel injection pressure also benefit the dilution of oil in common operating conditions.The test results have a good guiding significance for injector design.
作者
王福志
Wang Fuzhi(BAIC Motor Powertrain Co.,Ltd.,Beijing,101106,China)
出处
《小型内燃机与车辆技术》
2019年第1期19-25,29,共8页
Small Internal Combustion Engine and Vehicle Technique
