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Injector Selection and Matching Technology for Advanced GDI Engines

Author: LiXiangChao
Tutor: ZhangYuYin
School: Shanghai Jiaotong University
Course: Vehicle Engineering
Keywords: Direct injection gasoline engine Fuel wet wall Spray characteristics CFD. Multi-stage injection
CLC: TK413.84
Type: Master's thesis
Year: 2012
Downloads: 87
Quote: 0
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Abstract


Relative to conventional airway injection gasoline engine , direct injection gasoline engine has obvious advantages in fuel economy , power and cold start , is the inevitable trend of development of the gasoline engine . Wet wall problem common fuel direct injection gasoline will cause oil dilution , the decline in fuel economy and exhaust emissions increase . By spray , combustion chamber and cylinder flow field three reasonable matching and optimization can significantly reduce fuel wet wall . CFD calculations to optimize the matching aspects of its advantages in cost and time in the combustion system to obtain a wide range of applications . However , due to the lack of comprehensive and accurate model calibration data , most of the existing CFD computing research reliability can not be guaranteed . Through the the transient white , LIF, PIV and PDI advanced laser diagnostic techniques to compensate for the deficiencies of the existing research on a porous direct injection injector spray angle throughout the pitch , velocity and particle diameter spray characteristics conducted a comprehensive experimental study , using commercial CFD software AVL FIRE establish the spray model and the experimental data on the model calibration and validation , the last calibrated the spray model on supercharged direct-injection engine three-dimensional moving spray and mixture formation process simulation grid . Through this study , the following conclusions : 1 ) the use of the spray angle , penetration is laser test results of the velocity field , the cross-sectional distribution of mass and particle size distribution of the spray model calibration to get accurate and reliable spray calculation model injection engine ; 2) research in low - speed full- load conditions there is a serious spray rebuffed the rebuffed position are mainly located in the intake side of the cylinder wall and the piston top surface ; 3 ) delayed injection timing can reduce the amount of spray hitting the wall , but will cause the gas mixture evenly decreased ; 4 ) two-stage injector spray rebuffed phenomenon can be reduced effectively , but the second paragraph of the later ejection of the compression top dead center of cylinder mixture gas concentration distribution uniformity of the worse ; 5) the injector mounting position and the spray hole layout optimization of to reduce spray can to a certain extent to the wall, and improve the distribution of the concentration of the gas mixture .

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CLC: > Industrial Technology > Energy and Power Engineering > Internal combustion engine > Gasoline > Structure > Fuel system > Nozzle device ( injection system)
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