scholarly journals Vacuum Outgassing Study of Candidate Materials for Next Generation Pulsed Power and Accelerators: Improving the Boundary Conditions for Molecular Flow Simulations

2019 ◽  
Author(s):  
S. C. Simpson ◽  
R. S. Goeke ◽  
P. R. Miller ◽  
K. R. Coombes ◽  
K. J. Dezetter ◽  
...  
Keyword(s):  
Boundary Conditions ◽  
Pulsed Power ◽  
Molecular Flow ◽  
Next Generation ◽  
Flow Simulations

scholarly journals Fundamental studies on initiation and evolution of multi-channel discharges and their application to next generation pulsed power machines.

2014 ◽  
Author(s):  
Jens Schwarz ◽  
Mark E. Savage ◽  
Diego Jose Lucero ◽  
Deanna M. Jaramillo ◽  
Kelly Gene Seals ◽  
...  
Keyword(s):  
Pulsed Power ◽  
Next Generation

scholarly journals LDRD Report: Topological Design Optimization of Convolutes in Next Generation Pulsed Power Devices.

2017 ◽  
Author(s):  
Eric C. Cyr ◽  
Gregory John von Winckel ◽  
Drew Philip Kouri ◽  
Thomas Anthony Gardiner ◽  
Denis Ridzal ◽  
...  
Keyword(s):  
Design Optimization ◽  
Pulsed Power ◽  
Next Generation ◽  
Power Devices ◽  
Topological Design

scholarly journals Comparison of Reactive Flow Simulations for a LOX/CH4 Multi-element Rocket Engine

2019 ◽  
Vol 304 ◽  
pp. 07007
Author(s):  
Ainslie D. French ◽  
Luigi Cutrone ◽  
Antonio Schettino ◽  
Marco Marini ◽  
Francesco Battista ◽  
...  
Keyword(s):  
Experimental Data ◽  
Boundary Conditions ◽  
Numerical Simulations ◽  
Rocket Engine ◽  
Engine Performance ◽  
Heat Fluxes ◽  
Reactive Flow ◽  
Flow Data ◽  
Flow Simulations ◽  
Experiment Validation

This study details the reactive flow simulations of a LOX/CH4 Multi-element rocket engine. The work has been conducted within the framework of the HYPROB-BREAD project whose main objective is the design, manufacture and testing of a LOX/LCH4 regeneratively cooled ground demonstrator. Numerical simulations have been carried out with both commercial software and CIRA software developed in house. Two sets of boundary conditions, nominal and experimental, have been applied from which a code-to-code validation has been effected with the former and a code-to-experiment validation with the latter. The results presented include both flow data and heat fluxes as well as parameters associated with engine performance, and indicate an excellent agreement with experimental data of a LOX/CH4 Multi-element rocket engine.

Steady-Flow Analysis of Low Pressure Compression System for Turbofan Engines

2007 ◽  
Author(s):  
Abdulnaser I. Sayma
Keyword(s):  
Boundary Conditions ◽  
Static Pressure ◽  
Flow Analysis ◽  
Low Pressure ◽  
Flow Simulations ◽  
Fan Performance ◽  
Turbofan Engines ◽  
Flow Domain ◽  
Pressure Boundary Conditions ◽  
Bypass Ratio

This paper has two main objectives. It first aims at presenting a method of prescribing boundary conditions for the steady-state flow simulations of low pressure compression systems for turbofan engines. The methodology is generic and it can be applied for steady and unsteady flow simulations of numerous similar multi-component applications. The basic idea is to extend the flow domain upstream to the far field and downstream beyond the first set of stator vanes, both in the bypass and core, where variable area nozzles are used. Fixed static pressure boundary conditions are used downstream of the nozzles which are representative of downstream blockage. With such an approach, the need to prescribe accurate boundary conditions immediately upstream and downstream of the fan is eliminated. An iterative approach is then used to obtain the correct bypass ratio. The second objective of the paper is to demonstrate the use of the methodology in mapping out the loss loop for the outflow guide vanes (OGV) and examine its effects on fan performance. Wherever possible, predictions were checked against measured data and good overall agreement was obtained.

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