Flame Propagation of Premixed Gas with Enhanced Heat Recirculation: Dynamic Characteristics of Lean and Rich Combustion DOI Open Access
Huaming Dai,

Chongxue Zou,

Xinyi Wang

et al.

Energy Technology, Journal Year: 2024, Volume and Issue: unknown

Published: July 25, 2024

Porous media combustion greatly improves the of low calorific value gas (LCG), and appropriate heat control contributes to optimizing flame evolution. To obtain dynamic characteristics lean‐rich combustion, an enhanced heat‐recirculating burner is built by embedding cylindrical rod with high thermal conductivity. The temperature distribution products are investigated under different parameters operating conditions. results indicate that reduction equivalence ratio inlet velocity both beneficial for upstream propagation rich‐methane flame, which has opposite trend lean combustion. Regardless direction in propagates, propagates fastest as diameter 8 mm. When 8–120 embedded burner, downstream time shortened 73.40%. embedment rods porous not only accelerates but also promotes conversion methane syngas. Moreover, decrease pellet conducive increasing syngas production. above conclusions provide theoretical support efficient clean utilization LCG media.

Language: Английский

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

E Jiaqiang,

Jiangjun Ding

et al.

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

Published: Jan. 9, 2025

Language: Английский

Citations

3
Effects of deformed twisted tapes on thermal performance enhancement of hydrogen fueled micro combustor for micro-thermophotovoltaic system DOI
Jintao Li,

E Jiaqiang,

Jiangjun Ding

et al.

Applied Thermal Engineering, Journal Year: 2025, Volume and Issue: 264, P. 125413 - 125413

Published: Jan. 5, 2025

Language: Английский

Citations

2
Effect analysis on thermal performance enhancement and entropy generation reduction in micro-combustors with different geometric structures fueled with the hydrogen/air and hydrogen/ammonia/air DOI
Lei Cai,

E Jiaqiang,

He Zhao

et al.

Fuel, Journal Year: 2024, Volume and Issue: 374, P. 132535 - 132535

Published: July 19, 2024

Language: Английский

Citations

6
Partial oxidation of methane based on optimized gas flow with efficient thermal recirculation and carbon dioxide reduction DOI
Huaming Dai,

Chongxue Zou

Journal of Cleaner Production, Journal Year: 2025, Volume and Issue: unknown, P. 144732 - 144732

Published: Jan. 1, 2025

Language: Английский

Citations

0
Dynamics of unsteady premixed flames in meso-scale channels and the effects of varying the wall heating conditions DOI
Akhil Aravind, Gautham Vadlamudi, Saptarshi Basu

et al.

Journal of Fluid Mechanics, Journal Year: 2025, Volume and Issue: 1008

Published: April 2, 2025

Understanding the dynamics of flames at small scales opens up opportunities to enhance performance small-scale power generation devices, micro-reactors, fire safety devices and numerous other systems that confine combustion micro/meso scales. The current study investigates laminar premixed methane–air in meso-scale channels. A cylindrical quartz tube, functioning as an optically accessible combustor, is externally heated by a primary heater facilitate auto-ignition reactant mixture flowing through tube. Experiments were conducted over wide range Reynolds numbers ( $Re$ ) equivalence ratios $\Phi$ ). Apart from previously documented observations unsteady with repetitive extinction ignition (FREI) characteristics, this identifies additional propagating flame (PF) regime. While FREI appeared stoichiometric fuel-rich conditions, PFs observed ratio $0.8$ . Unlike regime, where extinguishes after characteristic travel distance, continue till they reach upstream end combustor extinguish upon encountering meshed constriction. These are associated heat release rate oscillation couples pressure fluctuations frequencies close natural harmonic further how variations wall temperature profile affect PF regimes. To achieve this, secondary introduced varying distances heater, effectively imposing distinct bimodal heating profiles trends justified using simplified theoretical arguments based on estimate mean flow propagation model accounts for losses. novel findings work provide valuable insights can significantly impact design development advanced micro/meso-scale systems.

Language: Английский

Citations

0
Effect analysis on the low-temperature preheating performance of a novel micro-combustor air preheater for the cold start of the Li-ion battery packs DOI
Jintao Li,

E Jiaqiang,

Jiangjun Ding

et al.

Energy, Journal Year: 2024, Volume and Issue: unknown, P. 133606 - 133606

Published: Oct. 1, 2024

Language: Английский

Citations

3
The influence of radiation modeling on flame characteristics and emissions prediction in microcombustors with Ammonia/Hydrogen blends DOI Creative Commons

De Giorgi Maria Grazia,

Cinieri Giacomo,

Marseglia Guido

et al.

Fuel, Journal Year: 2024, Volume and Issue: 377, P. 132759 - 132759

Published: Aug. 14, 2024

Language: Английский

Citations

3
Investigations of a micro-thermo-photovoltaic system fuelled with ammonia/hydrogen under extreme operational conditions DOI Creative Commons
He Zhao, Dan Zhao, Yunpeng Su

et al.

International Journal of Hydrogen Energy, Journal Year: 2024, Volume and Issue: 94, P. 364 - 375

Published: Nov. 12, 2024

Language: Английский

Citations

1
Flame Propagation of Premixed Gas with Enhanced Heat Recirculation: Dynamic Characteristics of Lean and Rich Combustion DOI Open Access
Huaming Dai,

Chongxue Zou,

Xinyi Wang

et al.

Energy Technology, Journal Year: 2024, Volume and Issue: unknown

Published: July 25, 2024

Porous media combustion greatly improves the of low calorific value gas (LCG), and appropriate heat control contributes to optimizing flame evolution. To obtain dynamic characteristics lean‐rich combustion, an enhanced heat‐recirculating burner is built by embedding cylindrical rod with high thermal conductivity. The temperature distribution products are investigated under different parameters operating conditions. results indicate that reduction equivalence ratio inlet velocity both beneficial for upstream propagation rich‐methane flame, which has opposite trend lean combustion. Regardless direction in propagates, propagates fastest as diameter 8 mm. When 8–120 embedded burner, downstream time shortened 73.40%. embedment rods porous not only accelerates but also promotes conversion methane syngas. Moreover, decrease pellet conducive increasing syngas production. above conclusions provide theoretical support efficient clean utilization LCG media.

Language: Английский

Citations

0