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首页> 外文期刊>Journal of Mechanical Science and Technology >Optical investigation of the fuel injector influence in a PFI spark ignition engine for two-wheel vehicles
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Optical investigation of the fuel injector influence in a PFI spark ignition engine for two-wheel vehicles

机译：对两轮PFI火花点火发动机中喷油器影响的光学研究

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This paper describes the results obtained in a port fuel injection spark-ignition (PFI SI) engine by optical diagnostics during the fuel injection and the combustion process. A research optical engine was equipped with the fuel injection system, the head and the exhaust device of a commercial 250 cc engine for scooters and small motorcycles. Two injectors were tested: standard 3-hole injector that equipped the real reference engine and a 12-hole injector. The intake manifold was modified to allow the visualization of the fuel injection using an endoscopic system coupled with CCD camera. Size and number of the fuel droplets were evaluated through an image processing procedure. The cycle resolved visualization and chemiluminescence allowed to follow the combustion process from the spark ignition to the exhaust phase. All the optical data were correlated with engine parameters and exhaust emissions. The effect of the fuel injector type on deposits formed by fuel accumulation and dripping on the intake valves steams and seats was investigated. In particular, the evolution of diffusion-controlled flames due to the fuel deposits burning was analyzed. These flames were principally located near the intake valves, and they persisted well after the normal combustion event. The consequences were the formation and emission of soot and unburned hydrocarbons. The multi-hole injector helped reducing wall wetting and deposit formation so that the emission characteristic can be improved. The use of 12-hole injector allowed a more homogeneous distribution for a lower time of fuel droplets in the intake manifold than the 3-hole injector. This study also investigated the detailed physical/chemical phenomena to figure out reasons for the improvement using optical measurements.
机译：本文介绍了在燃油喷射和燃烧过程中通过光学诊断在进气道燃油喷射火花点火（PFI SI）发动机中获得的结果。研究型光学引擎配备了燃油喷射系统，商用250 cc踏板车和小型摩托车的引擎的头部和排气装置。测试了两个喷油器：配备实际参考发动机的标准3孔喷油器和12孔喷油器。进气歧管经过修改，可以使用与CCD摄像头耦合的内窥镜系统可视化燃料喷射。通过图像处理程序评估燃料滴的大小和数量。该循环解决了可视化和化学发光问题，可以跟踪从火花点火到排气阶段的燃烧过程。所有的光学数据都与发动机参数和废气排放相关。研究了燃油喷射器类型对燃油积聚和滴落在进气门蒸汽和阀座上形成的沉积物的影响。特别地，分析了由于燃料沉积物燃烧引起的扩散控制火焰的演变。这些火焰主要位于进气门附近，并且在正常燃烧事件之后仍持续存在。结果是烟尘和未燃碳氢化合物的形成和排放。多孔喷射器有助于减少壁的润湿性和沉积物的形成，从而可以改善发射特性。与3孔喷油器相比，使用12孔喷油器可在进气歧管中分配更均匀的油滴，并减少其进气时间。这项研究还调查了详细的物理/化学现象，以找出使用光学测量进行改进的原因。

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