IN–CYLINDER PRESSURE MEASUREMENT AND COMBUSTION ANALYSIS OF A CNG FUELLED SI ENGINE TESTING
Abstract: Numerous attempts
to use natural
gas in engine
have succeeded, but further development is
still needed. Many
applications to date
have been based
on retrofitting spark ignition or diesel engines and have failed to
maintain the brake specific fuel (bsfc), or power density (kW/litre of engine
displacement) of the base engine used. However, even thought these attempts
have not captured the optimum advantages of natural gas, they still are an
improvement over the base engine in fuel
costs and emissions.
The UTM CNG
Engine Research Group
has already performed research in
this alternative fuel in SI engine, either in single cylinder research engine
or within four
cylinders commercial based engine.
To have a clear
understanding of the
CNG fuelled engine
characteristics, a pressure transducer has installed on one of
the modified cylinder heads. Along with this, the crank angle encoder was also
fit to measure theangle of the crankshaft and top dead
centre (TDC) position.
A Data Acquisition
System (DAS) consist
of charge and voltage module, signal conditioner and DAQ plug-in card, was also set up and was
supported by the software to enable data
processing. The results show that in term of pressure rise and burn rate, the
CNG operation produced a slightly differences compared to that of
gasoline. The results also confirmed the
lower flame speed
CNG characteristic’s with
longer combustion period
needed. Although, produced lower pressure rise compared to gasoline
operation, the CNG fuelled engine generated less emission.
Penulis: Mardani Ali Sera
Kode Jurnal: jptmesindd100133
