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Research Papers: Fuel Combustion

Effect of Fuel Injection Timing and Injection Pressure on Combustion and Odorous Emissions in DI Diesel Engines

[+] Author and Article Information
Murari Mohon Roy

Department of Mechanical Engineering, Rajshahi University of Engineering and Technology (RUET), Rajshahi 6204, Bangladeshmmroy5767@yahoo.com

J. Energy Resour. Technol 131(3), 032201 (Aug 04, 2009) (8 pages) doi:10.1115/1.3185346 History: Received June 26, 2008; Revised April 05, 2009; Published August 04, 2009

This study investigated the effect of fuel injection timing and injection pressure on combustion and odorous emissions in a direct injection diesel engine. Injection timings from 15 deg before top dead center (BTDC) to top dead center (TDC) and injection pressures from 20 MPa to 120 MPa were tested. In emissions, exhaust odor, irritation, aldehydes, total hydrocarbon, and hydrocarbon components are compared in different injection timings and injection pressures condition. Injection timings where main combustion takes place very close to TDC are found to show minimum odorous emissions. Moderate injection pressures (60–80 MPa) showed lower emissions including odor and irritation due to proper mixture formation. Below the injection pressure of 40 MPa, and over 80 MPa, emissions become worse. Combustion analysis is performed by taking cylinder pressures after engine warm-up for different injection timings and injection pressures and analyzing cylinder temperatures and heat release rates. Cylinder pressures and temperatures are gradually decreased when injection timings are retarded. Ignition delay becomes shortest at 5–10 deg BTDC injection timings. The peak cylinder pressure and temperature are increased with higher injection pressures. The shortest ignition delay and minimum emissions is found at around 60 MPa of injection pressure.

Copyright © 2009 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Schematic diagram of the experimental system

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Figure 2

Relationship between odor rating and eye irritation time

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Figure 3

Effect of injection pressure on exhaust odor and irritation at different injection timings

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Figure 4

Effect of injection pressure on aldehyde emissions at different injection timings

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Figure 5

Effect of injection pressure on THC emissions at different injection timings

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Figure 6

Cylinder pressure and temperature at various injection pressures at the injection timing of TDC

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Figure 7

Cylinder pressure and temperature at various injection pressures at the injection timing of 5 deg BTDC

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Figure 8

Cylinder pressure and temperature at various injection pressures at the injection timing of 10 deg BTDC

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Figure 9

Cylinder pressure and temperature at various injection pressures at the injection timing of 15 deg BTDC

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Figure 10

Peak cylinder pressure and temperature at various injection timings and pressures

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Figure 11

Ignition delay at various injection timings and pressures

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Figure 12

Variation in exhaust gas temperatures in cylinders at different injection timings and pressures

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Figure 13

Variation in THC in cylinders at different injection timings and pressures

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Figure 14

Exhaust odor and aldehydes in the highest and lowest temperature cylinders

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Figure 15

HC components in exhaust gases at 10 deg BTDC-60MPa and TDC-20 MPa

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Figure 16

Cylinder pressure diagram at 10 deg BTDC-60MPa and TDC-20 MPa

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