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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. 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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Presentation Transcript
slide1

Numerical Study on the Low Emission Window

of HCCI Combustion

Sung Wook Park and Rolf D. Reitz

Sponsor : Diesel Emissions Reduction Consortium

slide2

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

slide3

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

slide4

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

slide5

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

slide6

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

slide7

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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