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Research Papers: Fuel Combustion

Laminar Burning Speeds of Nitromethane-Gasoline Blends at Elevated Temperatures and Pressures

[+] Author and Article Information
S. Raviteja

Aerospace Engineering Department,
Indian Institute of Technology-Madras,
Chennai 600036, India
e-mail: sraviteja@gmail.com

P. A. Ramakrishna

Aerospace Engineering Department,
Indian Institute of Technology-Madras,
Chennai 600036, India

A. Ramesh

Mechanical Engineering Department,
Indian Institute of Technology-Madras,
Chennai 600036, India

1Corresponding author.

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received August 29, 2018; final manuscript received October 7, 2018; published online November 19, 2018. Editor: Hameed Metghalchi.

J. Energy Resour. Technol 141(4), 042202 (Nov 19, 2018) (7 pages) Paper No: JERT-18-1674; doi: 10.1115/1.4041725 History: Received August 29, 2018; Revised October 07, 2018

Nitromethane is extensively used in drag races and in glow plug unmanned aerial vehicle (UAV) engines. However, it has not been analyzed in the combustion literature enough. Nitromethane has a low stoichiometric air–fuel ratio; it can be blended with gasoline and used in larger quantities to enhance the power output of the internal combustion (IC) engines. This could find potential use in burgeoning UAV industry. The present investigation aims at experimentally determining the laminar burning speeds of nitromethane—gasoline blends at different equivalence ratios. Tests were conducted at both ambient conditions and at elevated temperatures and pressures. A constant volume combustion chamber (CVCC) was constructed and instrumented to carry out the investigation. The pressure rise in the chamber due to combustion was acquired and analyzed to determine the laminar burning speeds. The results showed that with an increase in the nitromethane concentration in gasoline, the laminar burning speeds for all the initial conditions also increased. With the rise in initial temperatures, the laminar burning speeds were observed to increase. However, a drop was observed with a rise in the initial pressures for all the blends. The obtained results for pure gasoline were compared with existing literature. A good match was observed. The investigation also aims at providing vital experimental data, which can be used for computational fluid dynamics validation studies later.

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Figures

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Fig. 1

Schematic diagram of CVCC

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Fig. 2

Comparison of the measured and the smoothened pressure trace

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Fig. 3

Pressure trace in a CVCC

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Fig. 4

Comparison of present results with existing literature for gasoline

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Fig. 5

Comparison of the present results with existing literature for ethanol

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Fig. 6

Peak pressure variation with equivalence ratio at ambient condition

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Fig. 7

Burning speed variation with equivalence ratio at ambient condition

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Fig. 8

Variation in peak pressure with equivalence ratio

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Fig. 9

Variation in peak pressure with equivalence ratio at different initial pressures

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Fig. 10

Variation in peak pressure with equivalence ratio at different initial temperatures

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Fig. 11

Variation in burning speed with equivalence ratio

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Fig. 12

Variation in burning speed with equivalence ratio at different initial pressures

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Fig. 13

Variation in burning speed with equivalence ratio at different initial temperatures

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