Study of Flow Characteristics of Air in DI Diesel Engine by Modification in Intake Valve

Abstract

This project work involves experimental investigation of intake valve to generate swirling of air fuel mixture inside cylinder for Direct Injection (D.I) diesel engine. Three different types of intake valves having different configuration on its face are studied. The average swirl number and flow coefficient is obtained using a paddle wheel test bench. Swirl ratio is the ratio of rotary speed of the paddle wheel in a swirl measurement test rig, to the engine speed as calculated by measuring flow rate of intake air. The second part of work focused on the Computation Fluid Dynamics (CFD) to study flow distribution and flow velocity inside cylinder. The simulations are carried out on different valve lifts ranging from 4mm to 13mm on Ansys 16. Intake valves with four blades on valve seat shows better results for swirl ratio and flow coefficient in one of the cases when compared to base geometry. With this modification in intake valve results of this work shows improvement in swirl generation and flow distribution.