Numerical Study of Flow Velocity in The Intake Manifold of Single Cylinder Port Operated Two-Stroke Spark Ignition Engine
Journal Title: Invention Journal of Research Technology in Engineering & Management - Year 2019, Vol 3, Issue 6
Abstract
Performance of internal combustion engine (ICE) is chiefly dependent on the supply rate and hence, in-flow velocitythrough the intake manifold. Fresh charge through the intake manifold experiences velocity gradient due togeometric constraints and fluid resistance [1]. The reduction in flow velocity causes incomplete delivery before the complete closure of intake port. This study uses unidirectional transient velocity model to determine time required for complete charge delivery into the crankcase/cylinder in two stroke spark ignition engines. Finite difference scheme is employed to approximate the model for unsteady non-uniform flow. A bench work involving measurements of the average flow rates at different intake pressures and engine speeds is conducted using a ported operated single cylinder two-stroke spark ignition C12-HS engine utilizing pre-mixed fuel. It is observed that at low engine speeds and intake pressures, flow is predominantly non-uniform requiring about1.5 to 6.5 ms for maximum delivery, while unsteady condition dominates the flow at higher speeds and manifold pressures with maximum delivery occurring at about 1.25 ms; which tends to agree reasonably with the intake manifold design of Singh for axial velocity against manifold axial position [2], as well as the result of Jasen et al. [3], on runner length against engine speed.
Authors and Affiliations
,Lawal Muhammed Nasir
Keywords
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