The Characteristics Of The In-Cylinder Fluid Flow Of The 660cc Petrol Engine

Pauzi, Faiz Syazwan (2019) The Characteristics Of The In-Cylinder Fluid Flow Of The 660cc Petrol Engine. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

Two major challenges for modern engine in the industry of automotive is continuous increase of fuel price and strict emission regulations. Numerous research and development on air flow during the intake stroke and air flow in the engine cylinder are done. This is because in-cylinder fluid flow has significant effect on the in-cylinder mixture preparation, combustion performance and engine response. This is all towards cleaner emissions and high fuel efficiency. Introduction of new engine technologies such as spark controlled compression ignition (SPCCI) that is use in Mazda Skyactiv-X engine also contribute to increasing of attention on in-cylinder charge motion. In-cylinder fluid flow in an engine are air flow going into the engine cylinder with a swirl or tumble motion of air. The fluid flow enhances fuel vaporization and fuel-air mixing process for combustion. Therefore, the aim of this project is to study in-cylinder fluid flow of 660cc, petrol engine under steady state condition. Parameters of in-cylinder fluid flow that going to be study are air flow rate into the cylinder that is then translated into coefficient of discharge, Cd, swirl speed and tumble speed during intake stroke using a Superflow® SF-1020-SB flow bench machine. The experiments were done on cylinder 2 of the engine at 25” H2O test pressure. Cd and swirl speed were measured at various intake valve lift per diameter ratio, L/D. Tumble speed was measured at intermediate and maximum L/D at various cylinder head orientation, θ. Result from all the test done was recorded and discussed in the report. Cd increase gradually with L/D and the maximum Cd was 0.33. Swirl speed also increase with L/D but the trend is more random. Maximum swirl speed is 1770rpm at 0.35L/D. Maximum tumble speed obtained was 2250rpm at 0.35L/D. And the orientation that produce high tumble speed at both intermediate and maximum L/D is at 0˚.

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