EXPLORE PUBLICATIONS BY COUNTRIES

Spark Ignition Combustion. , , , Two Stroke Engine, Radical Combustion, Exhaust Port Throttling, Trial Plates for Throttling Control

Radical combustion is a critical condition behind control. In two stroke engine, condition of radical combustion could be achieved through control of the trapped exhaust gases at a certain condition, might be include the engine load, speed, concentration of the unburned hydrocarbons, their temperature and other operational parameters. An earlier work was conducted towards the achievement of the radical combustion. The exhaust gases were controlled, using a throttling mechanism just at the exhaust port opening. The mechanism was made to throttle the opening of the exhaust port at a range of 1% to 8 % [1]. However several difficulties were faced, mainly with the control mechanism of throttling. In addition the complexity in identifying the critical conditions at which the radical combustion could be achieved. In this paper, a new strategy was used to control the exhaust port throttling in a way to manage the amount of exhaust gases trapped and avoiding the drawbacks of the throttling mechanism in the earlier work.. Three trial plates were used, one-sixth closed, one-third closed and half closed to throttle the exhaust gases leaving the combustion chamber. Investigating of the engine running, incorporated with this new strategy of exhaust port throttling (throttling control at the exit of the exhaust port) leads to several interesting results about the criticality and conditions at which radial combustion is occurring. Results reveal the possibility of achieving radical combustion, when using the one-sixth closed plate under relatively higher load. Therefore, partial trapping of the exhaust gases should be carried, through restriction of the opening of the exhaust port not exceed 15% of port exit area. However it is more interesting, that throttling of the exhaust for two stroke engines have clear effect on the quality and stability of the combustion and hence its direct effect on the fuel consumption and the rate of pollutants expelled to the environment.