An experimental study on the improvement of mixture distribution for the automotive S.I. Engines

Abstract

In a fuel supply system of gasoline engines, a part of the fuel ejected from the carburetor floats in flow with high speed as dro plets in an intake manifold and the rest of it flows as the liquid film along the wall of the intake manifold and is gradually vaporized in the flow. Finally, most part of the fuel terminates the vaporization after introducing mixture into cylinders. Accordingly, it is desirable to maintain the optimum mixture ratio in conventional carburetor systems for all operating conditions of engines. The intake system including the carburetor of automotive gasoline engines which are mostly operating in partload conditions have many unsolved problms, such as the increase of specific fuel consumption and reduction of exhaust emissions due to the rich mixture in starting, acceleration and over load operations. Therefore the main purpose of the study is to develop a special device (so called Eco-Ring) for the enhancement of atomization that has ability to separate the liquid film spray flowing along the pipe wall of the intake manifold and to atomize it to fine droplets, then the device can overcome some defects which arise in the conventional carburetor systems as mentioned above.