(1) The viable DMDF operating range in terms of load and
methanol substitution percent (MSP) has been achieved over
a load range from 6% to 100% of full load. The operating
range is restricted by four bounds: partial burn, misfire, roar
combustion and knock respectively.
(2) The lower bound of the operating range is limited by partial
burn, which occurs at 20% load conditions with high MSP. At
the partial burn bound, the combustion process is highly
worsened due to the cooling effect of premixed methanol
in the intake process and compression stroke.
(3) The onset of misfire provides the right bound for normal
operation when the load increases to medium load. The
decrease of pilot diesel injection and extremely low intake
temperature cause the fuel/air mixture unable to ignite or
reach HCCI-like knock in some cycles.
(4) The extremely loud engine noise defines the roar combustion
bound at medium to high load. The increase in the mass
of methanol causes an increase in the ignition delay period
of pilot diesel which then auto-ignites and starts burning
the gaseous fuel at a higher rate of pressure rise.
(5) At high load, the appearance of knock provides the upper
bound of the operating range. DMDF combustion with
excessive MSP is extremely loud and measured in-cylinder
pressure traces show strong acoustic oscillations.
(6) Over the viable operating range, the maximum MSP is quite
load dependent, reaching its peak of about 76% at 43.5%
engine load under this particular speed. DMDF combustion
worsens the BTE at low load while boosts it at medium
and high load.
(1) The viable DMDF operating range in terms of load andmethanol substitution percent (MSP) has been achieved overa load range from 6% to 100% of full load. The operatingrange is restricted by four bounds: partial burn, misfire, roarcombustion and knock respectively.(2) The lower bound of the operating range is limited by partialburn, which occurs at 20% load conditions with high MSP. Atthe partial burn bound, the combustion process is highlyworsened due to the cooling effect of premixed methanolin the intake process and compression stroke.(3) The onset of misfire provides the right bound for normaloperation when the load increases to medium load. Thedecrease of pilot diesel injection and extremely low intaketemperature cause the fuel/air mixture unable to ignite orreach HCCI-like knock in some cycles.(4) The extremely loud engine noise defines the roar combustionbound at medium to high load. The increase in the massof methanol causes an increase in the ignition delay periodof pilot diesel which then auto-ignites and starts burningthe gaseous fuel at a higher rate of pressure rise.(5) At high load, the appearance of knock provides the upperbound of the operating range. DMDF combustion withexcessive MSP is extremely loud and measured in-cylinderpressure traces show strong acoustic oscillations.(6) Over the viable operating range, the maximum MSP is quiteload dependent, reaching its peak of about 76% at 43.5%โหลดโปรแกรมภายใต้ความเร็วเฉพาะนี้ เผาไหม้ DMDFworsens BTE ที่โหลดต่ำในขณะที่เพิ่มที่กลางและน้ำหนักได้สูง
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