A three-dimensional computational model of H2–air premixed combustion in non-circular micro-channels for a thermo-photovoltaic (TPV) application

Akhtar, Saad; Kurnia, Jundika C.; Shamim, Tariq

doi:10.1016/j.apenergy.2015.04.068

Cited by 130 publications

(25 citation statements)

References 30 publications

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“…The coupled algorithm is applied for the velocity pressure decoupling of the Navier-Stokes equations (Jiang et al 2015). The standard k- model (Kuo et al (2007)) is used for turbulent flow and the eddy dissipation concept (EDC) model (Akhtar et al (2015)) are applied for the chemical reaction. 9 species and 19 reversible reaction mechanisms of H2/air are given in Table 2 (Yang et al (2014)).…”

Section: Numerical Setupmentioning

confidence: 99%

“…But in this research, the circular cross-section has been used. Akhtar et al (2015) discussed the reasons for this difference. However, this simulation is in good agreement with our previous work.…”

Section: Validation Of the Numerical Simulationmentioning

confidence: 99%

“…Gradually reducing the wall thickness of the micro-cylindrical combustor makes wall temperature distribution higher and more uniform, which is proposed by Zuo et al (2017). Akhtar et al (2015) showed the effects of channel crosssection (circular, rectangular, square, trapezoidal, and triangular) on the total efficiency. Also, they reported that a Reynolds Stress Model (RSM) for turbulent flow with the Eddy Dissipation Concept (EDC) model for combustion proses, gives the best prediction of the wall temperature.…”

Section: Introductionmentioning

confidence: 99%

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Thermal and Exergy Assessment of a Micro Combustor Fueled by Premixed Hydrogen/Air under Different Sizes: a Numerical Simulation

2020

JAFM

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In this work, a numerical study has been carried out in order to investigate the effects of a micro combustor size on the exergy and energy efficiencies of a premixed hydrogen/air for a micro thermophotovoltaic system. For this purpose, six combustors in different sizes are designed, in which geometry dimensional size gradually reduced. The effects of the combustor size on the entropy, exergy, radiation power, and energy conversion efficiency are investigated. Also, mean and uniform wall temperature are discussed. In order to compare the entropy generation of each micro combustor, a dimensionless entropy generation rate is defined. The hydrogen/air combustion with 9 species and 19 reversible elementary reactions were simulated by using the Eddy Dissipation Concept (EDC) model. Results indicate the micro-combustor geometry size has important effects. A reduction of the combustor geometry size dimensionality causes an increase in average wall temperature and makes it uniform. Moreover, by decreasing micro combustor size, the radiation power efficiency increases from 41.96 to 45.62% and total energy conversion efficiency from 6.46 to 7.02%. The highest exergy efficiency, 38.63%, is achieved in the smallest micro combustor while the minimum exergy efficiency 33.22%, is obtained in the largest micro combustor.

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Section: Numerical Setupmentioning

confidence: 99%

Section: Validation Of the Numerical Simulationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Thermal and Exergy Assessment of a Micro Combustor Fueled by Premixed Hydrogen/Air under Different Sizes: a Numerical Simulation

2020

JAFM

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“…Moreover, MTPV system also has the problem of low total energy conversion efficiency [24][25][26][27]. Research has indicated that the uniformity of combustion chamber wall temperature influences the energy conversion efficiency of MTPV system [28]. In addition, [4,23] Li et al [4,29,30] established that the use of porous media contributed immensely to the wall temperature rise, which translates into the efficiency of the combustor.…”

Section: Introductionmentioning

confidence: 99%

Exploring the Benefits of Annular Rectangular Rib for Enhancing Thermal Efficiency of Nonpremixed Micro-Combustor

Wang

Fang

Lou

et al. 2020

Journal of Chemistry

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Micro-combustor can provide the required thermal energy of micro-thermal photovoltaic (MTPV) systems. The performance of MTPV is greatly affected by the effectiveness of a micro-combustor. In this study, a numerical simulation was conducted to explore the benefits of annular rectangular rib for enhancing the thermal performance of a nonpremixed micro-combustor. Based on the investigations under various rib heights, rib positions, and inlet mass flow rates, it is found that the addition of annular rectangular ribs in the micro-combustor creates a turbulent zone in the combustion chamber, thereby enhancing the heat transfer efficiency between the inner wall of the combustion chamber and the burned gas. The micro-combustor with annular rectangular rib shows a higher and more uniform wall temperature. When the H2 mass flow is 7.438 × 10−8 kg/s and the air mass flow is 2.576 × 10−6 kg/s, the optimum dimensionless rib position is at l = 6/9 and r = 0.4. At this condition, the micro-combustor has the most effective and uniform heat transfer performance and shows significant decreases in entropy generation and exergy destruction. However, the optimum l and r significantly depend on the inlet mass flow of H2/air mixture.

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“…This concept in the context of thrust generation for various applications such as small robotics and nanosatellites also explored by same research group using methanol as fuel [15]. Numerous numerical studies have been performed to understand the flame stabilization and its dynamics in microchannels in past decade [16][17][18][19][20]. Wan and Zhao [17] investigated the flame dynamics in a novel preheating micro combustor suitable for portable power applications.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigations on a new high intensity dual microcombustor based thermoelectric micropower generator

2018

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A new concept of dual microcombustor based thermoelectric micropower generator with high power density (~0.14 mW/mm 3) and high conversion efficiency (4.66 %) is reported in this work. A new configuration with a dual microcombustor system is experimentally investigated with two thermoelectric modules and operates with liquefied petroleum gas as fuel. The dual microcombustor is fabricated using a rectangular aluminium metal block and detailed investigations on flame stability limits and thermal characteristics were carried out. Dual microcombustor configuration helps to significantly improve the flame stability limits and thermal characteristics over the single combustor configuration due to increased flame-surface interaction and enhanced heat recirculation through solid walls. Maximum power point tracking (MPPT) algorithm is applied to achieve a maximum power output of 4.52 W with a maximum conversion efficiency of 4.66 %. The application of porous media significantly helped improve the upper flame stability limits with a maximum conversion efficiency of 4.32 %, and 4.66 %, at  = 1 and 0.9 respectively at 10 m/s mixture velocity. The system compactness and high output power with significantly improved conversion efficiency shows the possibility of its application in various portable micro-scale power generators for remote, stand-alone, military and aerospace applications.

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A three-dimensional computational model of H2–air premixed combustion in non-circular micro-channels for a thermo-photovoltaic (TPV) application

Cited by 130 publications

References 30 publications

Thermal and Exergy Assessment of a Micro Combustor Fueled by Premixed Hydrogen/Air under Different Sizes: a Numerical Simulation

Thermal and Exergy Assessment of a Micro Combustor Fueled by Premixed Hydrogen/Air under Different Sizes: a Numerical Simulation

Exploring the Benefits of Annular Rectangular Rib for Enhancing Thermal Efficiency of Nonpremixed Micro-Combustor

Experimental investigations on a new high intensity dual microcombustor based thermoelectric micropower generator

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