Swirl Ratio and Mean Flow Coefficient within S.I. Engine Using Shrouded Intake Valve and Correlation Equations for Its Prediction

In spark ignition engine, reduce in fuel consumption and exhaust emissions can be achieved by implementation of lean burn strategy by integrating swirl motion in the working fluid of the engine. Intake generated swirling flow can be produced by the use of shrouded intake valve. The advantage of using the shrouded intake valve is that it can be manufactured at ease, and it allows finding the appropriate level of swirl by turning the valve about its axis; however, it provides larger restriction to the incoming fluid. In this backdrop an experimental study has been conducted which highlight the variation of swirl ratio and mean flow coefficient within a spark ignition (SI) engine using shrouded intake valve of different shroud angle. The results obtained from the study show that the percentage variation of swirl ratio and mean flow coefficient within an SI engine on varying the shroud angle of a shrouded intake valve, is not affected by test pressure drop. Finally, in this study, correlation equations are proposed for prediction of swirl ratio and mean flow coefficient within an SI engine using shrouded intake valve of any degree of shroud angle.