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Research Papers: Internal Combustion Engines

Postinjection Strategy for the Reduction of the Peak Pressure Rise Rate of Neat n-Butanol Combustion

[+] Author and Article Information
Marko Jeftić

Department of Mechanical, Automotive,
and Materials Engineering,
University of Windsor,
Windsor, ON N9B 3P4, Canada
e-mail: jeftic2@uwindsor.ca

Ming Zheng

Department of Mechanical,
Automotive, and Materials Engineering,
University of Windsor,
Windsor, ON N9B 3P4, Canada

1Corresponding author.

Contributed by the IC Engine Division of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received January 29, 2016; final manuscript received January 29, 2016; published online March 30, 2016. Editor: David Wisler.

J. Eng. Gas Turbines Power 138(9), 092807 (Mar 30, 2016) (9 pages) Paper No: GTP-16-1047; doi: 10.1115/1.4032765 History: Received January 29, 2016; Revised January 29, 2016

Enhanced premixed combustion of neat butanol in a compression ignition engine can have challenges with regards to the peak pressure rise rate (PRR) and the peak in-cylinder pressure. It was proposed to utilize a butanol postinjection to reduce the peak PRR and the peak in-cylinder pressure while maintaining a constant engine load. Postinjection timing and duration sweeps were carried out with neat n-butanol in a compression ignition engine. The postinjection timing sweep results indicated that the use of an early butanol postinjection reduced the peak PRR and the peak in-cylinder pressure and it was observed that there was an optimal postinjection timing range for the maximum reduction of these parameters. The results also showed that an early postinjection of butanol increased the nitrogen oxide emissions, and a Fourier transform infrared spectroscopy (FTIR) analysis revealed that late postinjections increased the emissions of unburned butanol. The postinjection duration sweep indicated that the peak PRR was significantly reduced by increasing the postinjection duration at constant load conditions. There was also a reduction in the peak in-cylinder pressure. Measurements with a hydrogen mass spectrometer showed that there was an increased presence of hydrogen in the exhaust gas when the postinjection duration was increased but the total yield of hydrogen was relatively low. It was observed that the coefficient of variation for the indicated mean effective pressure was significantly increased and that the indicated thermal efficiency was reduced when the postinjection duration was increased. The results also showed that there were increased nitrogen oxide, carbon monoxide, and total hydrocarbon (THC) emissions for larger postinjections. Although the use of a postinjection resulted in emission and thermal efficiency penalties at medium load conditions, the results demonstrated that the postinjection strategy successfully reduced the peak PRR, and this characteristic can be potentially useful for higher load applications where the peak PRR is of greater concern.

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Figures

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Fig. 1

Schematic of the engine experimental setup

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Fig. 2

Effect of postinjection timing on PRR and pMAX

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Fig. 3

Impact of early postinjections on the HRR

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Fig. 4

Impact of delayed postinjections on the HRR

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Fig. 5

Effect of post-timing on THC, CO, and H2

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Fig. 6

Effect of postinjection timing on hydrocarbon speciation

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Fig. 7

Effect of postinjection timing on indicated efficiency

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Fig. 8

Impact of post-timing on NOx and smoke emissions

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Fig. 9

Effect of postinjection duration on PRR, pMAX, and COVIMEP

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Fig. 10

Impact of postinjection duration on in-cylinder pressure

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Fig. 11

Impact of postinjection duration on HRR

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Fig. 12

Impact of postinjection duration on bulk gas temperature

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Fig. 13

Effect of postinjection duration on indicated efficiency and IMEP

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Fig. 14

Impact of postinjection duration on NOx and smoke

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Fig. 15

Effect of postinjection duration on THC, CO, and hydrogen

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Fig. 16

Effect of postinjection duration on hydrocarbon speciation

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