Investigation on thermophotovoltaic performance enhancement of the hydrogen fueled micro combustors with the center-cleared twisted tapes for micro-thermophotovoltaic system

Applied Thermal Engineering, Journal Year: 2025, Volume and Issue: 264, P. 125483 - 125483

Published: Jan. 9, 2025

Language: Английский

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Numerical Analysis of Combustion and Thermal Performance of a Bluff-Body and Swirl-Stabilized Micro-Combustor with Premixed NH3/H2/Air Flames

Energies, Journal Year: 2025, Volume and Issue: 18(4), P. 780 - 780

Published: Feb. 7, 2025

This research presents a novel bluff-body and swirl-stabilized micro-combustor fueled by an ammonia/hydrogen mixture, aimed at enhancing flame stabilization for zero-carbon micro-combustion-based power generators. Employing numerical simulations, the study examines effects of geometry, inlet mass flow rate, vane angle, combustor material on combustion thermal efficiencies. Key findings demonstrate that shape significantly influences outcomes, with cone-shaped designs showing lowest radiation efficiency among tested geometries. The identifies optimal rate 9×10−6 kg/s, which achieves 99% superior uniformity in mean outer wall temperature. While variations primarily affect NO emissions temperatures, they have minimal impact efficiency. Further analysis reveals adjusting angle from 15 to 60 degrees improves temperature uniformity, efficiencies, while also reducing emissions. 60-degree is particularly effective, achieving approximately 44% Additionally, selection plays pivotal role, silicon carbide outperforming others delivering optimized (approximately 910 K), (38.5%), most uniform Conversely, quartz exhibits lower performance metrics.

Language: Английский

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Numerical study on the design and thermal performance of a novel hedging dual-inlet planar micro-combustor with an insert baffle

International Journal of Hydrogen Energy, Journal Year: 2025, Volume and Issue: 109, P. 1169 - 1180

Published: Feb. 17, 2025

Language: Английский

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A CFD Study of Thermodynamics and Efficiency Metrics in a Hydrogen-Fueled Micro Planar Combustor Housing Dual Heat-Recirculating Cylindrical Combustors for MTPV Applications

Processes, Journal Year: 2025, Volume and Issue: 13(4), P. 1142 - 1142

Published: April 10, 2025

The micro combustor is the energy source of micro-thermophotovoltaic systems; thus, optimizing its design one key parameters that lead to an increase in output energy. Therefore, enhance system’s overall efficiency, this numerical work introduces a new configuration for parallel-flow (PF) and counter-flow (CF) hydrogen-fueled cylindrical combustors integrated into planar combustor. To overcome short residence time applications causing high heat dissipation, house heat-recirculating channels allow more transfer external walls. In pursuit target, simulations are carried out analyze thermodynamic system efficiency parameters. addition, different initial operating conditions varied optimize system, including inlet velocity equivalence ratio. results reveal PF CF structures result significantly higher wall temperatures uniform temperature variations than conventional (CD). Despite entropy generations, exhaust gas 591 K 580 lower CD, respectively, both 14% increases radiation efficiency. Increasing improves thermal designs; however, experiences drastic reduction. power density highlights unity ratio as optimal. designs yield roughly identical findings, but exhibits most cases due equal from opposite sides.

Language: Английский

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Enhancing Thermal Performance Investigations of a Methane-Fueled Planar Micro-Combustor with a Counter-Flow Flame Configuration

Energies, Journal Year: 2025, Volume and Issue: 18(1), P. 195 - 195

Published: Jan. 5, 2025

To enhance the performance of combustors in micro thermophotovoltaic systems, this study employs numerical simulations to investigate a planar microscale combustor featuring counter-flow flame configuration. The analysis begins with an evaluation effects (1) equivalence ratio Φ and (2) inlet flow rate Vi on key thermal combustion parameters, including average temperature main wall (T¯w), non-uniformity (R¯Tw) radiation efficiency (ηr). findings indicate that increasing causes these parameters initially increase subsequently decrease. Similarly, leads monotonic decline ηr, while T¯w R¯Tw exhibit rise-then-fall trend. A comparative between proposed conventional reveals that, under identical conditions, use counterflow configuration can reducing R¯Tw. Nusselt number shows micro-combustor achieves larger area positive numbers higher numbers, which highlights improved heat transfer from fluid solid. Furthermore, comparison blow-off limits exhibits superior stability broader flammability range. Overall, provides preliminary investigation into configurations combustors.

Language: Английский

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Comparison of the effects of piloted-ignition and spark ignition on combustion of a vibration hydrogen combustor

International Journal of Hydrogen Energy, Journal Year: 2025, Volume and Issue: 125, P. 15 - 27

Published: April 10, 2025

Language: Английский

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Scaling up ethanol fueled step micro-combustor for higher power generation

Energy, Journal Year: 2025, Volume and Issue: unknown, P. 136328 - 136328

Published: May 1, 2025

Language: Английский

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