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Multi-Element Unstructured Analyses of Complex Valve SystemsThe safe and reliable operation of high pressure test stands for rocket engine and component testing places an increased emphasis on the performance of control valves and flow metering devices. In this paper, we will present a series of high fidelity computational analyses of systems ranging from cryogenic control valves and pressure regulator systems to cavitating venturis that are used to support rocket engine and component testing at NASA Stennis Space Center. A generalized multi-element framework with sub-models for grid adaption, grid movement and multi-phase flow dynamics has been used to carry out the simulations. Such a framework provides the flexibility of resolving the structural and functional complexities that are typically associated with valve-based high pressure feed systems and have been difficult to deal with traditional CFD methods. Our simulations revealed a rich variety of flow phenomena such as secondary flow patterns, hydrodynamic instabilities, fluctuating vapor pockets etc. In the paper, we will discuss performance losses related to cryogenic control valves, and provide insight into the physics of the dominant multi-phase fluid transport phenomena that are responsible for the choking like behavior in cryogenic control elements. Additionally, we will provide detailed analyses of the modal instability that is observed in the operation of the dome pressure regulator valve. Such instabilities are usually not localized and manifest themselves as a system wide phenomena leading to an undesirable chatter at high flow conditions.
Document ID
20040084595
Acquisition Source
Stennis Space Center
Document Type
Preprint (Draft being sent to journal)
Authors
Sulyma, Peter
(NASA Stennis Space Center Stennis Space Center, MS, United States)
Ahuja, Vineet
(Combustion Research and Flow Technology, Inc. Pipersville, PA, United States)
Hosangadi, Ashvin
(Combustion Research and Flow Technology, Inc. Pipersville, PA, United States)
Shipman, Jeremy
(Combustion Research and Flow Technology, Inc. Pipersville, PA, United States)
Date Acquired
September 7, 2013
Publication Date
May 1, 2004
Subject Category
Fluid Mechanics And Thermodynamics
Report/Patent Number
SSTI-3000-0001-FLUIDS
Meeting Information
Meeting: 52 JANNAF Propulsion Meeting
Location: Las Vegas, NV
Country: United States
Start Date: May 10, 2004
End Date: May 13, 2004
Sponsors: Department of the Navy, Department of the Air Force, NASA Headquarters, Department of the Army
Funding Number(s)
CONTRACT_GRANT: NAS13-03009
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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