International Journal of Hydrogen Energy, Journal Year: 2024, Volume and Issue: 93, P. 68 - 77
Published: Nov. 1, 2024
Language: Английский
Energy and Built Environment, Journal Year: 2024, Volume and Issue: unknown
Published: Feb. 1, 2024
In this work, we propose and examine an ammonia-hydrogen fueled micro-combustor with a single-channel inlet double-channel outlet (SIDO). The combustion characteristics nitrogen oxide emission of ammonia/hydrogen-oxygen premixed are explored. Comparison is then made between the conventional proposed combustors. It found that our new design could lead to increase outer wall temperature reduce emission. performances different hydrogen blended ratios (Φb), velocities (Vin), equivalence (Φ) evaluated. increasing Φb reduces maximum flame pressure loss, enabling move upstream. When set 25%, convective heat transfer performance reaches its optimal level. uniformity can be improved by Vin. However, it accompanied increased NO emissions at outlet. Increasing Φ significantly emission, such reduction effect much more remarkable lower Φb. Examining exergy efficiency shown greatly in mixed fuel have almost no on ammonia. This study demonstrates feasibility improving thermal reducing varying structure for thermophotovoltaic applications.
Language: Английский
Citations
6
Energy, Journal Year: 2024, Volume and Issue: 299, P. 131444 - 131444
Published: April 28, 2024
Language: Английский
Citations
6
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
Citations
6
International Journal of Hydrogen Energy, Journal Year: 2025, Volume and Issue: 101, P. 1136 - 1148
Published: Jan. 6, 2025
Language: Английский
Citations
0
International Journal of Hydrogen Energy, Journal Year: 2025, Volume and Issue: 105, P. 80 - 89
Published: Jan. 20, 2025
Language: Английский
Citations
0
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
Citations
0
Journal of Aerospace Engineering, Journal Year: 2025, Volume and Issue: 38(4)
Published: March 28, 2025
Language: Английский
Citations
0
Energy, Journal Year: 2024, Volume and Issue: unknown, P. 133606 - 133606
Published: Oct. 1, 2024
Language: Английский
Citations
3
Processes, Journal Year: 2024, Volume and Issue: 12(9), P. 1848 - 1848
Published: Aug. 29, 2024
The current study proposes a novel design configuration of hydrogen-fueled micro cylindrical combustor. newly developed consists single-channel inlet and double-channel outlet with heat-recirculating structure aimed at enhancing the heat transfer mechanism from combustion to walls. Investigations are conducted using three-dimensional numerical simulation means, emphasis is placed on assessing effects key thermal parameters nitrogen oxide (NOx) emissions. modeling approach first validated against experimental data available in literature. A parametric then by means varying length width channel, velocity, equivalence ratio. findings revealed that significantly improves performance curtails NOx emissions comparison those conventional structure. For example, proposed leads radiation efficiency increase roughly 10%. preheating channel yields further optimization boosting process flame Elevating velocity exhibits pronounced mean wall temperature more uniform distribution temperature. However, exhaust gas increases increasing leading reduction exergy efficiencies. ratio unity optimizes parameters, as lean rich conditions suffer low hydrogen oxygen contents, respectively.
Language: Английский
Citations
2
International Journal of Heat and Fluid Flow, Journal Year: 2024, Volume and Issue: 106, P. 109323 - 109323
Published: Feb. 22, 2024
Language: Английский
Citations
1