Date of Award

11-1-2021

Publication Type

Thesis

Degree Name

M.A.Sc.

Department

Mechanical, Automotive, and Materials Engineering

Keywords

Compression ignition engines, Dimethyl ether, HACA surface growth

Supervisor

R. Riahi

Supervisor

V. Stolilov

Rights

info:eu-repo/semantics/openAccess

Abstract

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Compression ignition (CI) engines and diesel fuel are commonly used for long-distance transportation, marine transportation, and construction equipment due to their high thermal efficiency and relatively low cost. Meanwhile, compression ignition (CI) engine emissions such as CO, NOx, and soot cause human health issues, climate change, and pollution problems. To reduce emissions, especially by restraining the formation of soot, some new energy resources are researched for replacing diesel fuel.

Dimethyl ether (DME) is one kind of new energy resource with four main advantages: high cetane number, low auto-ignition temperature, simple chemical structure, and high oxygen content. A wide range of DME blending ratios would be selected for blending with diesel fuel in numerical simulations. The modelling would be a tool for engineers to analyse the emissions using a CI engine, and the simulation results would show the potential of DME and its impact on emission reduction.

CMCL Engine Suite would be employed, and an SRM model is the core of this software. The numerical method will analyse the inside mechanism, chemical interaction, and chemical turbulence for the blending fuel, revealing the trend through different figures. As the top priority, soot formation variations will be analysed at three stages: inception, HACA surface growth, and PAH condensation surface growth. The findings from previous studies of DME will be verified through the numerical method in this thesis.

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