Experimental and numerical investigation on optimizing energy efficiency and emissions reduction of ammonia fueled combustion with addition of hydrogen and porous media

Renewable Energy, Journal Year: 2025, Volume and Issue: unknown, P. 122422 - 122422

Published: Jan. 1, 2025

Language: Английский

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Effect of NH3/H2/O2 premixed combustion on energy conversion enhancement and NOx emission reduction of the segmented nozzle micro-combustor in thermophotovoltaic system

Renewable Energy, Journal Year: 2024, Volume and Issue: 228, P. 120682 - 120682

Published: May 20, 2024

Language: Английский

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Thermodynamic and entropy generation analyses of Telsa-valve structured meso-scale combustors fuelled with hydrogen for thermophotovoltaic applications

Energy, Journal Year: 2024, Volume and Issue: 307, P. 132788 - 132788

Published: Aug. 10, 2024

The present work numerically examed the effects of hydrogen volume flow rates (Qv) and equivalence ratios (Φ) on thermal performances meso-scale combustors structured with Tesla-vale type channels. Four distinct Tesla-valve configurations are implemented then subsequently compared. reverse-flow Tesla valve counter-flow combustor (RC) structure shows a remarkable improvement 72.6 % to wall temperature at Qv = 100 mL/min. diodicity (Di) is found be increased higher Qv, lower Φ contributes Di. Besides, Di decreased when goes up, stabilizing 0.9. exhibits more uniform pressure distribution entropy production than forward-flow valve. At 0.9, hydrogen-to-air ratio maximized heat release, producing highest entropy. demonstrate near complete combustion before reaching efficiency (ηcombustion) gradually after getting 1.0. RC construction achieved maximum under conditions insufficient oxygen. This study demonstrates feasibility enhancing overall channels, revealing key parameters characteristics in these combustors.

Language: Английский

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A comprehensive review of chemical reaction mechanisms and soot generation mechanisms for hydrogen and diesel additions to ammonia fuel and their emission characterization

Process Safety and Environmental Protection, Journal Year: 2024, Volume and Issue: 190, P. 413 - 442

Published: July 20, 2024

Language: Английский

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Numerical Analyses of Entropy Production and Thermodynamics Exergy on a Hydrogen-Fueled Micro Combustor Featuring a Diamond-Shaped Bifurcated Inner-Tube Structure for Thermophotovoltaic Applications

Entropy, Journal Year: 2025, Volume and Issue: 27(2), P. 114 - 114

Published: Jan. 24, 2025

To improve the heat transfer mechanisms from thermal energy to walls, current work presents a new structure for micro combustor fueled by hydrogen featuring diamond-shaped bifurcated inner-tube configuration. For this purpose, series of three-dimensional (3D) numerical analyses are conducted investigate effects length structure, width inner flame channels, inlet equivalence ratio, and volume flow rate on key performance thermodynamic parameters. In comparison conventional design, outcomes reveal that proposed configuration exhibits remarkable improvements in conversion efficiency, as it reduces mean exhaust gas temperature 585.98 K boosts exergy radiation efficiencies 7.78% 14.08%, respectively. The parametric study design parameters indicates elongating widening channels enhance dynamics consequently rates absorption walls. increase feeds system with additional and, therefore, advances average wall its uniformity across external surface. Nevertheless, also efficiency due limited capacity utilize large input along high magnitude entropy production resulting particularly mechanism chemical generation. Operating under stoichiometric condition balances oxygen premixed charge, achieving optimal combustor.

Language: Английский

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Numerical investigation on the combustion characteristics and NOx emission of non-premixed H2/NH3/air in vase-shaped micro combustor

International Journal of Hydrogen Energy, Journal Year: 2024, Volume and Issue: 91, P. 539 - 547

Published: Oct. 16, 2024

Language: Английский

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