An Experimental Study of the Effects of the Fuel Pulverization and the Fuel Vapourization by Exhaust Gas Heating in Agricultural Electric Ignition Engines

Abstract

1) When collected out or vapourized the liquid fuel which flows in intake manifold, stronger preignition is caused in the electric ignition engines for agricultural and industrial use. Therefore, some suitable measures should be taken to prevent the pre-ignition.
2) To get the best engine performance, there is an optimum heating for vapourizing higher boiling point constituents. Once optimum adjustment is made on the exhaust gas heating for full load operation, it is close to optimum for both part load and fast idling operations. Heating control is not necessary for each operation.
3) In electric ignition engines, there exist two mechanisms of fuel vapourization, namely, the vapourization of fuel particles which float in air stream and also the vapourization from combustion chamber walls where larger fuel particles are sticked by inertia collision. In kerosene engine, the roll of the latter is larger and the function of the former is insufficient.
4) By the pulverization of fuel particles and the vapourization of higher boiling point constituents by exhaust gas heating, combustion approaches to the homogeneous and theoretical one, and during the period of warming up, combustion rapidly approaches to steady state.
5) During the warming up period of kerosene engine, the oil dilution is not affected by the use of pulverizer nor vapourizer, but it is mainly affected by the quantity of fuel supplied into engine.
6) Even in gasoline engine, using the fuel of higher volatility, the pulverization of fuel particles or the vapourization of higher boiling point constituents provide better combustion, increasing engine output and decreasing fuel consumption ratio, as well as kerosene engine which uses the fuel of lower volatility.
7) By the pulverization of fuel particles and the vapourization of higher boiling point constituents by exhaust gas heating, kerosene and gasoline produce almost the same out put as far as the same kerosene engine is used.