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- Type of Document: M.Sc. Thesis
- Language: Farsi
- Document No: 51411 (08)
- University: Sharif University of Technology
- Department: Mechanical Engineering
- Advisor(s): Hosseini, Vahid
- Abstract:
- Diesel particulate filters (DPFs) are used in active and passive regeneration exhaust systems in order to reduce the soot emission of diesel engines. Soot regeneration process initiates at a certain minimum temperature. In Compression Ignition (CI) engines, the intake is not throttled usually, and load control is carried out by adjusting the amount of fuel injected into the cylinders. Consequently in low load working condition, as the fuel mass decreases, the air to fuel ratio increases that results in lowered exhaust gas temperature. On the other hand, passive regeneration strategies alone are not enough and it should be backed up by an active regeneration system in order to guarantee meeting the minimum thermal requirements for initiation of the regeneration process. This project proposes an active regeneration strategy for increasing the exhaust gas temperature regardless of working load condition that can be incorporated into all types of diesel engines.This study investigates the effect of intake or exhaust throttling on the exhaust gas temperature in diesel engines as a way to meet the required thermal condition for the regeneration of DPFs using both computer simulation and experimental examination. The computer simulation is carried out using GT-Power and the results are validated using the results from the experiments conducted on a light duty one-cylinder marine diesel engine (Farymann W18) in FCE lab at Sharif University of Technology.Two different strategies is considered; one in which the fuel mass injection, and the other in which the indicated power is held constant. The results have been analyzed and a 150℃ increase in the exhaust gas temperature is reported for the constant-indicated power strategy. Throttling the intake, despite throttling the exhaust, deeply affects the combustion phenomena in the cylinder. The exhaust gas temperature is higher and the indicated thermal efficiency is lower in the case that the intake is throttled
- Keywords:
- Diesel Engines ; Computer Modeling ; Experimental Simulation ; Diesel Particulate Filter (DPF) ; Active Regeneration ; Turottling ; GT-Power Software
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