Design Optimization of Green Monopropellant Thruster Catalyst Beds Using Catalytic Decomposition Modeling

Jung, Sangwoo; Choi, Sukmin; Kwon, Sejin

doi:10.2514/6.2017-4924

Cited by 10 publications

(3 citation statements)

References 7 publications

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“…In this simulation temperature reached highest value of slightly more than 1100K. From this, it is safe to say that temperature inside the catalyst bed can go from 700K up to more than 1000K which is compliment with the experimental findings such as by work of Othman [32], Kuan et al, [15], and Jung et al, [18] that acquired temperature of >700K to 1020K for the 90 wt% hydrogen peroxide. Figure 10 show the temperature different between experimental work adopted and the simulation result [32].…”

Section: Resultssupporting

confidence: 88%

“…It has many advantages over other type of conventional hydrazine-based propellant in terms of storing, workability and environment. Despite the benefits, it faces challenges in proving its performance because it seemed inferior compared to traditional propellant [17,18]. However, with recent studies and developments by scientist and engineers, significant improvement in terms of performances and other attributes can be seen and hydrogen peroxide is expected to play a bigger role in aerospace activities in near future.…”

Section: Introductionmentioning

confidence: 99%

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Porosity Effect of the Silver Catalyst in Hydrogen Peroxide Monopropellant Thruster

Shahrin

Othman

Mohd

et al. 2021

CFDL

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In monopropellant system, hydrogen peroxide is used with catalyst to create an exothermic reaction. Catalyst made of silver among the popular choice for this application. Since the catalyst used is in porous state, the effect of its porosity in the hydrogen peroxide monopropellant thruster performances is yet unknown. The porosity changes depending on factors including catalyst pact compaction pressure, bed dimension, and type of catalyst used. As researches on this topic is relatively small, the optimum porosity value is usually left out. The performance of the thruster indicated by the pressure drop across the catalyst bed. Porosity of the catalyst bed adds additional momentum sink to the momentum equation that contributes to the pressure gradient which lead to pressure loss inside thruster. The effect of porosity influences the performance and precision of the thruster. Study of the pressure drop by the catalyst bed requires a lengthy period and expensive experiments, however, numerical simulation by mean of Computational Fluid Dynamics (CFD) can be an alternative. In this paper, 90 wt% hydrogen peroxide solution with silver catalyst is studied in order to investigate the influence of porosity to the performances of the thruster, and to find the optimum porosity of the thruster. Species transport model is applied in the single-phase reaction simulation using the EDM for turbulence-chemistry interaction. Through this study, the effect of porosity towards the thruster performances represented in term of pressure drop, exit velocity, bed temperature, and thrust, and porosity of 0.4 found to be as an optimal value.

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Section: Resultssupporting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Porosity Effect of the Silver Catalyst in Hydrogen Peroxide Monopropellant Thruster

Shahrin

Othman

Mohd

et al. 2021

CFDL

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“…For monopropellant thrusters, a full understanding of the effect of catalyst bed geometry on the thruster performance is incomplete or unpublished. Experimental work typically uses either modular thruster designs allowing for testing different configurations or a limited selection of different thruster geometries [10][11][12]. Some research has used computational chemical reaction modelling of the catalyst bed to investigate the effect of the design on the performance [13][14][15].…”

Section: Iintroductionmentioning

confidence: 99%

Methodology for Geometric Optimization and Sizing for Subnewton Monopropellant Catalyst Beds

Fonda-Marsland

Roberts

Ryan

et al. 2021

Journal of Propulsion and Power

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Experimental testing of a number of novel additively manufactured monopropellant micro-thrusters was conducted under atmospheric conditions, using 87.5% concentration hydrogen peroxide. The aim of this work was to select a specific catalyst bed geometry for the thruster system, and to investigate more general methodologies for monopropellant packed catalyst bed optimization. Characteristic velocity efficiencies approaching 0.98 were demonstrated, and performance improved for smaller beds with low aspect ratios, although these beds flooded at lower propellant flow rates. The onset of bed flooding was used to identify physical limits of propellant flow rate supported by the catalyst. The particular propellantcatalyst pairing limit was defined by a Damköhler number of 56, independent of the bed geometry, with thermal performance peaking for the high flow rates just before flooding occurred. It is suggested that this method is extensible to other monopropellant systems, although with further work required to confirm it is a more general effect beyond thrusters using hydrogen peroxide.

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Effect of Porosity and Permeability Characteristics on the Silver Catalyst of the Hydrogen Peroxide Monopropellant Thruster Performances

Shahrin¹,

Othman²,

Mohd³

et al. 2022

Technological Advancement in Mechanical and Automotive Engineering

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Design Optimization of Green Monopropellant Thruster Catalyst Beds Using Catalytic Decomposition Modeling

Cited by 10 publications

References 7 publications

Porosity Effect of the Silver Catalyst in Hydrogen Peroxide Monopropellant Thruster

Porosity Effect of the Silver Catalyst in Hydrogen Peroxide Monopropellant Thruster

Methodology for Geometric Optimization and Sizing for Subnewton Monopropellant Catalyst Beds

Effect of Porosity and Permeability Characteristics on the Silver Catalyst of the Hydrogen Peroxide Monopropellant Thruster Performances

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