Research Papers: Fuel Combustion

Evaluating the Influence of Exhaust Back Pressure on Performance and Exhaust Emissions Characteristics of a Multicylinder, Turbocharged, and Aftercooled Diesel Engine

[+] Author and Article Information
Mayank Mittal

Generac Power Systems,
S45 W29290 Wisconsin 59,
Waukesha, WI 53189
e-mail: mmittal.28@gmail.com

Ron Donahue

Generac Power Systems,
S45 W29290 Wisconsin 59,
Waukesha, WI 53189
e-mail: Ron.Donahue@generac.com

Peter Winnie

Generac Power Systems,
S45 W29290 Wisconsin 59,
Waukesha, WI 53189
e-mail: Peter.Winnie@generac.com

1Present Address: Indian Institute of Technology Madras, Chennai, Tamil Nadu 600036, India.

Contributed by the Internal Combustion Engine Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received May 17, 2014; final manuscript received November 20, 2014; published online December 30, 2014. Assoc. Editor: Stephen A. Ciatti.

J. Energy Resour. Technol 137(3), 032207 (May 01, 2015) (5 pages) Paper No: JERT-14-1157; doi: 10.1115/1.4029383 History: Received May 17, 2014; Revised November 20, 2014; Online December 30, 2014

An experimental study was conducted to quantify the effects of exhaust back pressure (EBP) on performance and exhaust emissions characteristics of a diesel engine for generator application. The electromechanical system was composed of a commercially available six-cylinder, turbocharged, and aftercooled diesel engine, coupled with a generator rated at 500 kilowatt electrical (kWe) at full load. Experiments were conducted at different operating conditions for high and low EBPs. Exhaust emissions of nitrogen oxides (NOx), soot, particulate matter (PM), carbon monoxide (CO), and total hydrocarbons (HC) were measured. In addition, thermocouples and pressure sensors were provided at various locations to evaluate the engine performance. Results showed that the brake specific fuel consumption (BSFC) was increased at light loads for high EBP, but no significant difference was observed in BSFC at high loads. It was found that NOx emission was reduced at all operating loads, but soot and PM were increased with the increase in EBP. HC emission was relatively insensitive with increment of EBP.

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Fig. 1

Schematic diagram of experimental test setup

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Fig. 2

Experimental setup, showing the measurement location of EBP (or post-turbine pressure)

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Fig. 10

Effect of EBP on brake specific emissions of total HC at different loads

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Fig. 9

Effect of EBP on brake specific emissions of CO at different loads

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Fig. 8

Effect of EBP on brake specific emissions of soot and PM at different loads

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Fig. 7

Effect of EBP on exhaust oxygen concentration at different loads

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Fig. 6

Effect of EBP on concentration of nitric oxides at different loads

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Fig. 5

Effect of EBP on EGT at different loads

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Fig. 4

Effect of EBP on BSFC at different loads

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Fig. 3

High and low EBPs at different operating loads; engine speed: 1800 rpm



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