Development of a Catalytic Hydrogen Micro-Propulsion System

Chen, Chih Peng; Chao, Yei Chin; Wu, Chia Ching; Lee, Jung Chang; Chen, Guan Bang

doi:10.1080/00102200600793395

Cited by 16 publications

(3 citation statements)

References 16 publications

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“…This review focuses on microcombustion in the field of micropropulsion, a critical component of nanosatellite propulsion systems. Chen et al [184] developed a hydrogenbased micropropulsion system using catalytic microcombustion to provide power for microsatellites' maneuvers. They experimentally and numerically studied this system's performance, investigating parameters like fuel/air mixture flow rate, equivalence ratio, and nozzle contraction ratio.…”

Section: Mems Chemical Thrustersmentioning

confidence: 99%

A Review on Micro-Combustion Flame Dynamics and Micro-Propulsion Systems

Dias,

Resende,

Afonso

2024

Energies

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This work presents a state-of-the-art review of micro-combustion flame dynamics and micro propulsion systems. In the initial section, we focus in on the different challenges of micro-combustion, investigating the typical length and time scales involved in micro-combustion and some critical phenomena such as flammability limits and the quenching diameter.We present an extensive collection of studies on the principal types of micro-flame dynamics, including flashback, blow-off, steady versus non-steady flames, mild combustion, stable flames, flames with repetitive extinction, and ignition and pulsatory flame burst. In the final part of this review, we focus on micropropulsion systems, their performance metrics, conventional manufacturing methods, and the advancements in Micro-Electro-Mechanical Systems manufacturing.

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Section: Mems Chemical Thrustersmentioning

confidence: 99%

A Review on Micro-Combustion Flame Dynamics and Micro-Propulsion Systems

Dias,

Resende,

Afonso

2024

Energies

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“…Such mechanisms have the potential to achieve similar performance but at a much smaller physical scale. Micro-combustors also have applications in micro-propulsion where they have been used to generate thrust and provide control for small satellites [7].…”

Section: Micro-combustorsmentioning

confidence: 99%

Design Optimization of a Micro-Combustor for Lean, Premixed Fuel-Air Mixtures

Powell¹,

Aldredge²

2016

JPEE

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Present technology has been shifting towards miniaturization of devices for energy production for portable electronics. Micro-combustors, when incorporated into a micro-power generation system, create the energy desired in the form of hot gases to power such technology. This creates the need for a design optimization of the micro-combustor in terms of geometry, fuel choice, and material selection. A total of five micro-combustor geometries, three fuels, and three materials were computationally simulated in different configurations in order to determine the optimal micro-combustor design for highest efficiency. Inlet velocity, equivalence ratio, and wall heat transfer coefficient were varied in order to test a comprehensive range of micro-combustor parameters. All simulations completed for the optimization study used ANSYS Fluent v16.1 and post-processing of the data was done in CFD Post v16.1. It was found that for lean, premixed fuel-air mixtures (φ = 0.6 -0.9) ethane (C2H6) provided the highest flame temperatures when ignited within the microcombustor geometries. An aluminum oxide converging micro-combustor burning ethane and air at an equivalence ratio of 0.9, an inlet velocity of 0.5 m/s, and heat transfer coefficient of 5 W/m 2 -K was found to produce the highest combustor efficiency, making it the optimal choice for a microcombustor design. It is proposed that this geometry be experimentally and computationally investigated further in order to determine if additional optimization can be achieved.

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“…Hydrogen and carbon dioxide are the main components of the methanol fuel cell anode off-gas. Hydrogen is a highly reactive fuel both in homogeneous as well as in heterogeneous combustion systems. ,, In general, lightoff occurs at the entrance of the catalytic reactor as observed by the temperature measurements of Chen et al . Kramer et al report that the mass transfer regime was achieved at temperatures as low as 200 °C and at an equivalence ratio of 0.05, as a direct effect of the high surface reaction rate of hydrogen.…”

Section: Introductionmentioning

confidence: 99%

Experiments in a Catalytic Reactor Burning the Anode Off-Gas of a Methanol Fuel Cell

et al. 2007

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Methanol is considered as a good hydrogen carrier for mobile application of fuel cells. In such systems, the exhaust gas of the anode is a multicomponent gas composed of hydrogen and carbon dioxide as main constituents and methanol, carbon monoxide, and steam as minor species. It is necessary to burn out these gases in order to prevent emissions of combustibles and to increase the overall efficiency of the fuel cell. A study on the characteristics of a catalytic monolith reactor to oxidize such a fuel gas in near-adiabatic conditions is performed. Emissions and reactor wall temperature distributions are measured during the combustion of several fuel gas mixtures corresponding to design and off-design fuel cell conditions, in a large range of excess air ratios. The high surface reactivity and diffusion properties of hydrogen are seen to greatly enhance the combustion of the other species, by bringing the wall at temperatures sometimes greater than the expected adiabatic. Ultralow emissions of carbon monoxide and unburned hydrocarbons are achieved even at a temperature as low as 250 °C, allowing for great flexibility of the use of air or high anode hydrogen utilization for the fuel cell. In addition, startup and transient operations with excessive methanol content are shown to be well handled by the reactor. Finally, a practical engineering rule is given by defining two mass flow variables: one concerns the initial carbon containing fuel and the other the emitted unburned carbon containing fuel. These variables allow considering methanol and carbon monoxide as a single species, rendering the analysis independent of their respective concentrations in the multicomponent fuel mixture. A chart yielding three operational regimes (kinetic, diffusion, and optimal) can be defined which makes design for engineering purposes easier with regard to minimal pollutant emissions and optimal reactor power load.

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Development of a Catalytic Hydrogen Micro-Propulsion System

Cited by 16 publications

References 16 publications

A Review on Micro-Combustion Flame Dynamics and Micro-Propulsion Systems

A Review on Micro-Combustion Flame Dynamics and Micro-Propulsion Systems

Design Optimization of a Micro-Combustor for Lean, Premixed Fuel-Air Mixtures

Experiments in a Catalytic Reactor Burning the Anode Off-Gas of a Methanol Fuel Cell

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