Technology and Hardware

doi:10.2514/5.9781600868870.0033.0240

History of Liquid Propellant Rocket Engines 2006

DOI: 10.2514/5.9781600868870.0033.0240

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Technology and Hardware

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Cited by 2 publications

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A multi-objective, multidisciplinary design optimization methodology for the conceptual design of a spacecraft bi-propellant propulsion system

Fazeley

Taei

Naseh

et al. 2015

Struct Multidisc Optim

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Space propulsion systems play an increasingly important role in planning of space missions. The traditional method for design of space propulsion systems includes numerous design loops, which does not guarantee to reach the best optimal solution. Multidisciplinary Design Optimization (MDO) is an approach for the design of complex systems that considers a design environment with multiple disciplines. The aims of this study are to implement and compare Multidisciplinary Feasible and Collaborative Optimization architectures for the multi-Objective optimization of a bipropellant space propulsion system design. Several disciplines such as thrust chamber, cooling, and structure were exploited in a proper combination. The main optimization objectives in the MDO frameworks were to minimize the total wet mass and maximize the total impulse by considering several constraints. Furthermore, Genetic Algorithm and Sequential Quadratic Programming are employed as the system-level and local-level optimizers. The presented design methodology provides an interesting decision making approach to select the best system parameters of space propulsion systems under conflicting goals.

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A multi-objective, multidisciplinary design optimization methodology for the conceptual design of a spacecraft bi-propellant propulsion system

Fazeley

Taei

Naseh

et al. 2015

Struct Multidisc Optim

View full text Add to dashboard Cite

show abstract

On the fluidic behavior of an over-expanded planar plug nozzle under lateral confinement

et al. 2020

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The present work aims to study the fluidic behavior on lateral confinement by placing sidewalls on the planar plug nozzle through experiments. This study involves two cases of nozzle pressure ratio (NPR = 3, 6), which correspond to over-expanded nozzle operating conditions. Steady-state pressure measurements, together with schlieren and surface oil flow visualization, reveal the presence of over-expansion shock and subsequent interaction and modification of the flow field on the plug surface. The flow remains attached to the plug surface for NPR = 3; whereas for NPR = 6, a separated flow field with a recirculation bubble is observed. Spectral analysis of the unsteady pressure signals illustrates a clear difference between the attached and the separated flow. Besides, other flow features with a distinct temporal mode associated with and without lateral confinement are observed. The absence of lateral confinement reduces the intensity of low-frequency unsteadiness; however, on the contrary, the interaction region is relatively reduced under lateral confinement.

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Technology and Hardware

Cited by 2 publications

References 29 publications

A multi-objective, multidisciplinary design optimization methodology for the conceptual design of a spacecraft bi-propellant propulsion system

A multi-objective, multidisciplinary design optimization methodology for the conceptual design of a spacecraft bi-propellant propulsion system

On the fluidic behavior of an over-expanded planar plug nozzle under lateral confinement

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