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Assessing the Impact of Fuel/Working...

Nasim, Md. Nayer,

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Assessing the Impact of Fuel/Working Fluid Combinations on Combustion Characteristics: Flame Structure, Laminar Burning Velocity, and Emissions /

Record Type:	Electronic resources : Monograph/item
Title/Author:	Assessing the Impact of Fuel/Working Fluid Combinations on Combustion Characteristics: Flame Structure, Laminar Burning Velocity, and Emissions // Md. Nayer Nasim.
Author:	Nasim, Md. Nayer,
Description:	1 electronic resource (157 pages)
Notes:	Source: Dissertations Abstracts International, Volume: 86-12, Section: B.
Contained By:	Dissertations Abstracts International86-12B.
Subject:	Mechanical engineering. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=31931294
ISBN:	9798280724037

Assessing the Impact of Fuel/Working Fluid Combinations on Combustion Characteristics: Flame Structure, Laminar Burning Velocity, and Emissions /
Nasim, Md. Nayer,

Assessing the Impact of Fuel/Working Fluid Combinations on Combustion Characteristics: Flame Structure, Laminar Burning Velocity, and Emissions /Md. Nayer Nasim. - 1 electronic resource (157 pages)

Source: Dissertations Abstracts International, Volume: 86-12, Section: B.

The combustion of hydrocarbon fuels is currently the primary power generation approach used in different transportation and energy production systems. With increasingly strict emission regulations and the depletion of conventional fossil fuel reserves, the search for alternative, cleaner sources of energy have become a priority for tackling environmental pollution and the global energy crisis. Hydrogen (H2) and ammonia (NH3) are extremely attractive alternate fuels due to their inherent lack of carbon and potential compatibility with the existing transportation and power generation infrastructure. Unfortunately, due to diverging combustion characteristics in comparison to conventional fossil fuels such as natural gas, it is not feasible to simply use them as drop-in replacements in many applications such as internal combustion engines and gas turbines.The purpose of this research is to evaluate multiple methods of flame speed manipulation of conventional fossil fuels (CH4, C2H4, C2H6) and carbon-free alternatives (H2, NH3) inside an optically accessible constant volume combustion chamber (CVCC). Combustion characteristics of several fuel blends with different working fluids at multiple equivalence ratios and initial pressures are extensively analyzed in terms of laminar burning velocity, flame morphology, flame stability, peak pressure during combustion, and emissions. The emissions are analyzed using a Fourier Transform Infrared (FTIR) Spectroscopy system for detailed speciation (including NOx at ppm levels). A complementary computational approach was implemented in parallel with the experiments to validate the experimental results. Both the experimental and numerical approaches provided insight into the impact of various fuel and working fluid combinations on emissions.While ammonia is largely viewed as a promising alternative fuel due to its lack of carbon, several issues need to be addressed prior to widespread adoption. In addition to infrastructure and materials compatibility, one particular risk is an increase in NOx and N2O emissions due to the fuel-bound nitrogen in ammonia molecules. A specific section of this research is dedicated to investigate the potential of reducing NOx emissions from NH3 combustion through staging. This includes two distinct ignition events at disparate conditions; typically, a primary zone that partially burns a fuel-air mixture prior to completing the combustion in a subsequent stage with the introduction of additional air. The method of altering working fluids was utilized again to facilitate the di↵erentiation between fuel bound NOx and the thermal NOx generated from premixed combustion of ammonia by eliminating environmental nitrogen. Thus, this research will not only try to identify alternate fuel configurations suitable for existing applications but also contribute to lowering NOx emissions from future transportation and energy systems.

English

ISBN: 9798280724037Subjects--Topical Terms:

649730
Mechanical engineering.
Subjects--Index Terms:

Ammonia molecules

Assessing the Impact of Fuel/Working Fluid Combinations on Combustion Characteristics: Flame Structure, Laminar Burning Velocity, and Emissions /
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502 $b Ph.D. $c University of Massachusetts Lowell $d 2025.
520 $a The combustion of hydrocarbon fuels is currently the primary power generation approach used in different transportation and energy production systems. With increasingly strict emission regulations and the depletion of conventional fossil fuel reserves, the search for alternative, cleaner sources of energy have become a priority for tackling environmental pollution and the global energy crisis. Hydrogen (H2) and ammonia (NH3) are extremely attractive alternate fuels due to their inherent lack of carbon and potential compatibility with the existing transportation and power generation infrastructure. Unfortunately, due to diverging combustion characteristics in comparison to conventional fossil fuels such as natural gas, it is not feasible to simply use them as drop-in replacements in many applications such as internal combustion engines and gas turbines.The purpose of this research is to evaluate multiple methods of flame speed manipulation of conventional fossil fuels (CH4, C2H4, C2H6) and carbon-free alternatives (H2, NH3) inside an optically accessible constant volume combustion chamber (CVCC). Combustion characteristics of several fuel blends with different working fluids at multiple equivalence ratios and initial pressures are extensively analyzed in terms of laminar burning velocity, flame morphology, flame stability, peak pressure during combustion, and emissions. The emissions are analyzed using a Fourier Transform Infrared (FTIR) Spectroscopy system for detailed speciation (including NOx at ppm levels). A complementary computational approach was implemented in parallel with the experiments to validate the experimental results. Both the experimental and numerical approaches provided insight into the impact of various fuel and working fluid combinations on emissions.While ammonia is largely viewed as a promising alternative fuel due to its lack of carbon, several issues need to be addressed prior to widespread adoption. In addition to infrastructure and materials compatibility, one particular risk is an increase in NOx and N2O emissions due to the fuel-bound nitrogen in ammonia molecules. A specific section of this research is dedicated to investigate the potential of reducing NOx emissions from NH3 combustion through staging. This includes two distinct ignition events at disparate conditions; typically, a primary zone that partially burns a fuel-air mixture prior to completing the combustion in a subsequent stage with the introduction of additional air. The method of altering working fluids was utilized again to facilitate the di↵erentiation between fuel bound NOx and the thermal NOx generated from premixed combustion of ammonia by eliminating environmental nitrogen. Thus, this research will not only try to identify alternate fuel configurations suitable for existing applications but also contribute to lowering NOx emissions from future transportation and energy systems.
546 $a English
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650 4 $a Mechanical engineering. $3 649730
650 4 $a Energy. $3 876794
650 4 $a Analytical chemistry. $3 3168300
653 $a Ammonia molecules
653 $a Spectroscopy
653 $a Hydrogen
653 $a Energy production systems
653 $a Fossil fuel
690 $a 0548
690 $a 0486
690 $a 0791
710 2 $a University of Massachusetts Lowell. $b Mechanical Engineering. $e degree granting institution. $3 3824970
720 1 $a Mack, J. Hunter $e degree supervisor.
773 0 $t Dissertations Abstracts International $g 86-12B.
790 $a 0111
791 $a Ph.D.
792 $a 2025
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