Analysis of intake swirl in a compression ignition engine at different intake valve lifts

Abstract

Abstract In the present work, analysis of intake swirl is carried out on a single cylinder, direct injection diesel engine to determine the effect of swirl ratio on engine performance. A two dimensional CAD model was built to predict the pressure, temperature and velocity variation of air entering the cylinder during the suction and compression strokes of a cycle and the swirl ratio was calculated. Later, a three-dimensional model of the cylinder and a valve was made to carry out simulations at different valve lifts to identify and obtain the optimized swirl. Here, the maximum swirl ratio was obtained at 1\xa0mm of valve lift whereas minimum at 6\xa0mm of valve lift. The simulated results are validated with experimental data and good agreement was found between them. In addition to this, guide vanes were introduced in the intake manifold increasing the overall swirl ratio and hence leading to better engine performance.