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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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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


Numerical study on the low emission window of hcci combustion

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


Numerical study on the low emission window of hcci combustion

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


Numerical study on the low emission window of hcci combustion

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


Numerical study on the low emission window of hcci combustion

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


Numerical study on the low emission window of hcci combustion

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


Numerical study on the low emission window of hcci combustion

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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