| Atmospheric pollution, especially the haze, has been a serious threat to people’s health. To reduce pollution, protect the environment is very urgent and needs. Automobile exhaust emission is one of the main factors to form fog haze. Nozzle as an important part of automobile fuel injection system, directly affect the internal combustion engine fuel efficiency and emissions, which has been closely watched.This thesis through to the design of high pressure common rail diesel engine nozzle orifice of parameter in order to achieve the good effect of spray, the main research contents are as follows:(1) Planning and design a number of high pressure common rail injector nozzle with different structure parameters by orthogonal experimental method, and contact factory for production. Designing and set up a fuel injection test bench by high-speed cameras, high listing the camera and injector test bench, etc.(2) According to the experimental plan, experiment of each nozzle. By using high-speed camera for spray macro information video images, using professional SLR photography for microscopic information high-definition pictures, image information of fuel spray characteristics under different operating conditions is obtained.(3) Designing the spray particle identification algorithm and the particle size measurement algorithm, and using MATLAB software for secondary development to deal with all the spray images. Spray and spray mist particle information are obtained under different working conditions, different nozzle structure and dimensions.(4) Comparison, analysis, induction and summary experimental data, to obtain the spray atomization rule when single parameter changes, several parameters change or comprehensive parameters change. To provide reliable basis for diesel engine nozzle design. |
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