One-dimensional simulation of a retrofitted medium duty engine running using compressed natural gas
Environmental improvement and energy issues are recently becoming one of the worldwide concerns due to the increasing demand for petroleum usage especially from the automotive sector. This situation had lead to encounter for a new technology and reliable alternative fuel. A potential alternati...
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| Main Author: | |
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| Format: | Thesis |
| Language: | English English English |
| Published: |
2014
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| Subjects: | |
| Online Access: | http://eprints.uthm.edu.my/1591/2/24p%20MUHAMMAD%20YUSRI%20ISMAIL.pdf http://eprints.uthm.edu.my/1591/1/MUHAMMAD%20YUSRI%20ISMAIL%20COPYRIGHT%20DECLARATION.pdf http://eprints.uthm.edu.my/1591/3/MUHAMMAD%20YUSRI%20ISMAIL%20WATERMARK.pdf |
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| Summary: | Environmental improvement and energy issues are recently becoming one of the
worldwide concerns due to the increasing demand for petroleum usage especially
from the automotive sector. This situation had lead to encounter for a new
technology and reliable alternative fuel. A potential alternative fuel for compression
ignition (C.I.) engine is the compressed natural gas (CNG). For C.I. engines to
operate using CNG, or to be converted as a retrofitted CNG engine, further
modifications are required. Previous works reported loss in brake power (BP) and
increase in hydrocarbon (HC) emission for C.I. engine retrofitted with CNG fuelling.
Analysis of performance and exhaust emissions characteristics for CNG retrofitted
engine through experimental analysis requires high cost and very time consuming.
Thus, a One –Dimensional simulation software, was introduced in this study to
reduce the experimental process and setup. In this study a medium duty 4.3L, 4-
cylinder, 4-stroke retrofitted compression ignition engine (RE) model were used in
this simulation work over various operational conditions at low engine speed. At the
beginning of this study, the model was first compared with a medium duty 4.3L, 4-
cylinder, 4-stroke C.I. engine (DE) in order to predict the engine model capabilities
running with different fuel types at low speed condition. The most significant finding
in this simulation configuration is the RE model was able to reduce the fuel
consumption (BSFC) and experience lower; brake power (BP), brake torque (BT)
and brake thermal efficiency (BTE) by 18.1%, 30.3%, 30.7%, and 14.6%
respectively. For emissions results the model generated higher unburned
hydrocarbon emissions (HC) and lower; oxides of nitrogen (NOx), carbon dioxides
(CO2) and carbon monoxides (CO) by 99%, 60.2%, 56.4% and 36.1% respectively.
The model also had been tested at various air-fuel ratio (AFR) condition varies from
15 (rich), 17.2 (stoichiometric) and 19 (lean) condition. Finally the comparison
between the simulation model and experimental engine results for performance and
emissions characteristics at low engine speed are presented, and it is confirmed that
the result in this study able to produce a roughly similar trend. |
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