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Numerical Study on the Low Emission Window of HCCI Combustion

Numerical Study on the Low Emission Window of HCCI Combustion. Sung Wook Park and Rolf D. Reitz. Sponsor : Diesel Emissions Reduction Consortium. Diesel emissions such as CO, NO and soot are highly dependent on equivalence ratio and temperature.

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Numerical Study on the Low Emission Window of HCCI Combustion

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  1. Numerical Study on the Low Emission Window of HCCI Combustion Sung Wook Park and Rolf D. Reitz Sponsor : Diesel Emissions Reduction Consortium

  2. Diesel emissions such as CO, NO and soot are highly dependent on equivalence ratio and temperature. Emission levels on (equivalence ratio)-T (peak cycle temperature) map can provide information on the optimal HCCI engine operation conditions. Effects of IVC timing, EGR, intake temperature, engine load and engine speed on the emission- -T maps are studied. Low Emission Window Objectives and calculation conditions Motivation & Objectives Calculation conditions Code : KIVA-3V with CHEMKIN chemistry solver Operating conditions - Assume ideally homogeneous charge at IVC Engine specification - Equivalence ratio : 0.2-2.0 - Bore x stroke : 82.0 x 90.4 mm - Fuel amount : 20, 25, 30 mg - Compression ratio : 16.0:1 - Engine speed : 1,000, 2,000, 3,000 rpm - Displacement : 477cm3 - EGR : 0-70% - Tin : 320-440K Engine Research Center • 2-D computational mesh at TDC UW-Madison

  3. Effect of IVC timing on CO and NO emissions - Fuel amount : 20.0 mg IVC : -100o ATDC IVC : -115o ATDC - Engine speed : 2,000 rpm IVC : -130o ATDC IVC : -142o ATDC

  4. Effect of intake temperature on SOC and Pin - Fuel amount : 20.0 mg - Engine speed : 2,000 rpm Phi=0.6, EGR 50% Phi=1.0, EGR 50% Retarded IVC timing

  5. Effect of intake temp. on emissions and peak cycle temp. - Fuel amount : 20.0 mg Phi=0.6 Phi=1.0 - Engine speed : 2,000 rpm - EGR : 50% Engine Research Center UW-Madison

  6. Stat of combustion (30% accumulated heat release) - Fuel amount : 20.0 mg IVC : -100o ATDC IVC : -115o ATDC - Engine speed : 2,000 rpm IVC : -130o ATDC IVC : -142o ATDC

  7. Effect of engine speed and fuel amount on emissions Effect of engine speed Effect of fuel amount - Fuel amount : 20.0 mg - Engine speed: 2,000 rpm - IVC : -142o ATDC - IVC : -130o ATDC Engine Research Center UW-Madison

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