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Assesment of the PerformanceAssesment of the PerformanceEvaluation of Diesel EnginesEvaluation of Diesel Engines
fueled with DME, DME/Dieselfueled with DME, DME/DieselBlend and Neat DieselBlend and Neat Diesel
Submitted to: Assoc. Prof. FikretSubmitted to: Assoc. Prof. FikretInal Submitted by: zge BulunazInal Submitted by: zge Bulunaz
150202040150202040
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OutlineOutline
I.Introduction
II.DME as a fuel for engines
III. DME mixing with Diesel Fuel
IV.Emissions of Engines Fueled with DME,DME/Diesel Blend and neat Diesel
V. Conclusions
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I.IntroductionI.Introduction
Why Dimethyl ether(DME)?
DME;
Advantages
+ high cetane number and oxygen content+short molecular chains
+volatile organic compound
+non-carcinogenic, non-teratogenic, non-
mutagenic and non-toxic+tropospheric lifetime of dimethyl ether to be 5.1
days, environmentally friendly
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Disadvantages;-Low viscosity of DME-Higher fuel volume
-Low boiling point -> injection rate,performance of engines
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Objective
Comparison Performance and emissioncharacteristics of engines fueled withDME,DME/diesel blends and neat Diesel fuel
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II.DME as a Fuel for EnginesII.DME as a Fuel for Engines
Modifications;
-DME under 0.5 Mpa to keep it liquidphase
-Pressure of fuel supply system 1.2 to 3.0MPa
-larger amount of fuel supply(i.e.same
engine power; fuel energy of 1kg dieselfuel= 1.49kg of DME )
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Effect of fuel delivery advance angle on the in-cylinder pressure and heatEffect of fuel delivery advance angle on the in-cylinder pressure and heat
release raterelease rate
Effect of Fuel Delivery AdvanceAngle
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III.DME Mixing with Diesel FuelIII.DME Mixing with Diesel Fuel
Solubility;
*No need to add solvent*10wt% DME- DM1015wt% DME- DM15
20wt% DME-DM20
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Effect of temperature change on the solubility of DME in diesel fuel
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Power Characteristics of DME/dieselPower Characteristics of DME/dieselblends in Enginesblends in Engines
Power Outputs of DME/diesel blends at various fractions
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The comparison of HRR among various fuelsThe comparison of HRR among various fuels
Heat Release Rate of Engines with Diesel Fuel
and DME/Diesel Blend Fuel
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IV.EMISSIONS OF ENGINES FUELED WITHIV.EMISSIONS OF ENGINES FUELED WITH
DME,DME/DIESEL BLEND AND DIESELDME,DME/DIESEL BLEND AND DIESEL
Visible Pollutions
-High oxygen content of blend reduces smoke density
-Boiling point has an influence on soot formation
-DME presents almost smoke-free combustion over the whole spe
range compared to neat diesel engine
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Smoke Emissions of engines fueledSmoke Emissions of engines fueled
with DME and neat Dieselwith DME and neat DieselSmoke emissions of engines Fueled wit
DME and neat Diesel
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Invisible PollutionsInvisible Pollutionsa.NOx Emissionsa.NOx Emissions
Comparison between NOx emissionsthe engines fueled with DME and neadiesel
Comparison of NOx emissions ofdifferent weight fractions of DME/diesel blends and neat Diesel Fuel
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b.HC Emsionsb.HC Emsions
jHC emissions of engine fueled withDiesel and DME
HC emissions of various fractionedblends and neat diesel
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c. CO Emissionsc. CO Emissions
CO emissions of enginesfueled with neat diesel and
DME/diesel blend
CO emission of diesel enginesfueled with DME and diesel
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d. COd. CO22 EmissionsEmissions
CO2 emissions of engines fueled
with neat diesel and DME/dieselblend
CO2 emissions of engines
fueled with DME and diesel
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V. ConclusionsV. Conclusions
Fuel delivery advance anglepeak in-cylinder pressure, peak
HRR, peak PRR, and peak mean gastemperaturethe more DME fraction lets the
more HRRSmoke, HC, CO, CO2and NOx
emissions
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