lpg direct injection ppt download slides
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LPG direct injection seminar ppt download
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lpg direct injection ppt download slides

Abstract

Currently, commercial gasoline direct injection engines mainly use wall-guided combustion system to prepare stratified mixture. In this system, the fuel droplets injected from one cylinder side usually tend to wall wet on the piston crown and the other side of the cylinder, which causing an increases of the HC emission. The liquid phase LPG has a lower boiling point and a higher vapor pressure than gasoline. When it is injected with the pressure more than 5MPa, flashing will occur, which speeds up the mixture formation and reduces wall wet. In this paper the mixture formation of direct injection LPG engine at part load and full load were investigated by numerical simulation. The results showed that, compared with gasoline spray using a swirl injector at part load, the LPG spray employing a single-hole injector burst fast once injected, and spray tip penetration was reduced. This resulted that rich mixture was still not guided to the spark plug area, even near the end of compression stroke. Therefore, it is necessary to advance the fuel injection timing of 5~10°CA for LPG than gasoline at part load using single-hole injector at the same injection pressure. However, at high load, the injection advance could remain the same as that of gasoline.

Introduction

The Prins Direct LiquiMax-2.0 system is used parallel to the standard fuel system for bi-fuel or mono-fuel operation. The Direct LiquiMax-2.0 system is a master-slave system.

The Direct LiquiMax-2.0 system is designed for engines with a direct fuel injection system. Direct Injection means that the fuel is injected under high pressure [20-200 bar] directly into the cylinder instead of injecting the fuel into the manifold (port injection). The Direct LiquiMax-2.0 system uses a modified high pressure fuel pump and fuel injectors of the petrol system to inject the liquid LPG under high pressure into the cylinder. The Direct LiquiMax-2.0 alternative fuel system is equivalent to the original petrol injection technology and makes maximum use of the electronics and components already present. With the Direct LiquiMax-2.0 system the driver will experience no difference between driving on LPG or petrol. Extensive research by Prins in cooperation with the Dutch university has shown that LPG fuel is a very suitable fuel in combination with a direct fuel injected engine. The motor efficiency by the use of LPG has increased significantly. This results in a CO2 reduction of an extra 10%. The increased engine efficiency is a result of the chemical and physical properties of LPG.
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