Reacting flow characteristics based on the axis-switching phenomenon in a baffled micro combustor with rotated noncircular holes for micro-thermophotovoltaic system

Kim, Won Hyun; Park, Tae Seon

doi:10.1016/j.ijheatmasstransfer.2022.123169

Cited by 13 publications

(5 citation statements)

References 24 publications

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“…The framelet model performed better than the EDM model. They also observed axis-switching flow structures for air jets past the baffle plate with the square and triangular holes [148]. The use of baffle holes as inlets develops jet flow, and axis switching has an impact on spreading rate and flow mixing.…”

Section: Numerical Studies On Micro Combustorsmentioning

confidence: 94%

“…Suzuki et al proposed a design with baffle plates that include a central fuel nozzle and multiple holes for air injection. Numerous studies have been conducted on the impact of these baffles on various combustion characteristics, such as heat transfer, fuel-air mixing, turbulent reactive flows, flame stability, and flow characteristics [144][145][146][147][148]. Results show that introducing baffle plates can significantly improve flow mixing and flame structure in the can combustors.…”

Section: Numerical Studies On Micro Combustorsmentioning

confidence: 99%

“…The use of baffles improves combustion characteristics and helps to stabilize the flame in combustors. Kim et al investigated a micro can combustor that incorporated a baffle plate consisting of seven holes for CH4/air mixture [148]. They used the eddy dissipation model (EDM) and framelet model to analyze the system.…”

Section: Numerical Studies On Micro Combustorsmentioning

confidence: 99%

See 2 more Smart Citations

A Review on Flame Stabilization Technologies for UAV Engine Micro-Meso Scale Combustors: Progress and Challenges

Velidi

Yoo

2023

Energies

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Unmanned aerial vehicles (UAV)s have unique requirements that demand engines with high power-to-weight ratios, fuel efficiency, and reliability. As such, combustion engines used in UAVs are specialized to meet these requirements. There are several types of combustion engines used in UAVs, including reciprocating engines, turbine engines, and Wankel engines. Recent advancements in engine design, such as the use of ceramic materials and microscale combustion, have the potential to enhance engine performance and durability. This article explores the potential use of combustion-based engines, particularly microjet engines, as an alternative to electrically powered unmanned aerial vehicle (UAV) systems. It provides a review of recent developments in UAV engines and micro combustors, as well as studies on flame stabilization techniques aimed at enhancing engine performance. Heat recirculation methods have been proposed to minimize heat loss to the combustor walls. It has been demonstrated that employing both bluff-body stabilization and heat recirculation methods in narrow channels can significantly improve combustion efficiency. The combination of flame stabilization and heat recirculation methods has been observed to significantly improve the performance of micro and mesoscale combustors. As a result, these technologies hold great promise for enhancing the performance of UAV engines.

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Section: Numerical Studies On Micro Combustorsmentioning

confidence: 94%

Section: Numerical Studies On Micro Combustorsmentioning

confidence: 99%

Section: Numerical Studies On Micro Combustorsmentioning

confidence: 99%

See 1 more Smart Citation

A Review on Flame Stabilization Technologies for UAV Engine Micro-Meso Scale Combustors: Progress and Challenges

Velidi

Yoo

2023

Energies

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“…Several studies have proposed different microcombustor designs and investigated combustion characteristics. [20][21][22][23][24] Research team at Jiangsu University carried out an experimental and kinetic analysis on the flame stabilization of cofired ammonia/hydrogen-air mixtures. 25 Flame propagation is facilitated with the increase in the blend ratio which also increases the blow-off limit.…”

Section: Introductionmentioning

confidence: 99%

“…The geometry of the microcombustor plays an important role in maintaining combustion stability and heat loss. Several studies have proposed different microcombustor designs and investigated combustion characteristics 20‐24 . Research team at Jiangsu University carried out an experimental and kinetic analysis on the flame stabilization of cofired ammonia/hydrogen–air mixtures 25 .…”

Section: Introductionmentioning

confidence: 99%

CH₄/air combustion in a microscale recirculating heat exchanger: Sizing design using the heat transfer approach

Mohan,

Dinesha,

Rosen

2024

Heat Trans

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Microcombustors are microscale combustion devices that can be used to power microelectromechanical systems. Many combustor configurations are reported in the literature and, among them, combustion in a microscale recirculating heat exchanger is a feasible option. In this work, a simple, double‐channel, recirculating heat exchanger is considered. The novelty of the present work lies in the heat transfer analysis approach to design a microcombustor. A combustor is designed using thermal resistance networks for a premixed fuel containing a methane–air mixture in stoichiometric ratio. The length of the combustor is designed based on the position of the combustion flame. Computational fluid dynamics is utilized to validate the theoretical results. The analysis is carried out for adiabatic and nonadiabatic conditions. The combustor lengths for adiabatic and nonadiabatic (ceramic) combustors vary from 39 to 242 mm and 49 to 276 mm, respectively, for variations in the mass flow rate of the premixed gases from 6 to 10 mg/s. A minimum limiting flow rate of 6 mg/s was identified. The average error in the maximum combustion gas temperatures between the theoretical and CFD results obtained in this work is 4.2%. The theoretical approach presented can be suitably applied to more complex geometries involving multichannels and variations in geometrical properties.

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Effect of vane angle on combustion characteristics of premixed H2/air in swirl micro-combustors with straight vane or twisted vane

Kim¹,

Kim

Choe³

et al. 2023

Applied Thermal Engineering

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Reacting flow characteristics based on the axis-switching phenomenon in a baffled micro combustor with rotated noncircular holes for micro-thermophotovoltaic system

Cited by 13 publications

References 24 publications

A Review on Flame Stabilization Technologies for UAV Engine Micro-Meso Scale Combustors: Progress and Challenges

A Review on Flame Stabilization Technologies for UAV Engine Micro-Meso Scale Combustors: Progress and Challenges

CH₄/air combustion in a microscale recirculating heat exchanger: Sizing design using the heat transfer approach

Effect of vane angle on combustion characteristics of premixed H2/air in swirl micro-combustors with straight vane or twisted vane

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Reacting flow characteristics based on the axis-switching phenomenon in a baffled micro combustor with rotated noncircular holes for micro-thermophotovoltaic system

Cited by 13 publications

References 24 publications

A Review on Flame Stabilization Technologies for UAV Engine Micro-Meso Scale Combustors: Progress and Challenges

A Review on Flame Stabilization Technologies for UAV Engine Micro-Meso Scale Combustors: Progress and Challenges

CH4/air combustion in a microscale recirculating heat exchanger: Sizing design using the heat transfer approach

Effect of vane angle on combustion characteristics of premixed H2/air in swirl micro-combustors with straight vane or twisted vane

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CH₄/air combustion in a microscale recirculating heat exchanger: Sizing design using the heat transfer approach