Prediction of Swirl Velocity of In-Cylinder Flow of an Engine by a Simplified Simulation Model. 3rd Report. Improvement of Combustion by the Variable Shroud Mechanism.

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Inproving the combustion of spark ignition engines under the conditions of medium or low speed and low load contributes largely to the decrease of fuel consumption under the city driving conditions. As one of the utilities of this simulation model, the variable shroud mechanism to increase swirl velocity is proposed to improve combustion. This mechanism is mounted at the intake port near the intake valve to control swirl velocity as well as the amount of fuel air mixture. In this paper, by using the predictions of the simplified simulation model, it is confirmed that this mechanism is effective in considerably increasing swirl velocity at low load and low speed conditions and furthermore, to reduce the fraction of burned gas in the fresh mixture charge.