Nodal Modeling of Liquid Propellant Feed and Pressurization System - NASA Technical Reports Server (NTRS)
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Nodal Modeling of Liquid Propellant Feed and Pressurization SystemNodal or network flow modeling plays an important role in the design and operation of the feed and pressurization system of a liquid rocket engine. Model development and execution time is relatively short for nodal codes in comparison to the Navier-Stokes based CFD codes. Nodal models also allow the inclusion of several components into one model to predict the behavior of a larger system. Unlike CFD models, the nodal models do not need very fine discretization of the flow field because they use empirical correlations to model fluid friction and heat transfer. This paper presents several applications of nodal modeling of liquid propellant feed and pressurization systems using the Generalized Fluid System Simulation Program (GFSSP), a nodal code developed at NASA/ Marshall Space Flight Center. GFSSP discretizes the flow field into nodes which are connected by branches. The mass and energy conservation equations and the equation of state are solved to calculate pressure, temperature, and resident mass at the nodes. The momentum equations are solved at the branches to calculate flow rates. Applications include a) tank pressurization by inert gas as well as autogenous pressurization by gaseous propellant, b) submerged pressurization by helium, c) self-pressurization due to boil-off of cryogenic propellant, d) chilldown of a transfer line of a cryogenic propellant feed system, and e) chilldown and filling of a cryogenic tank. Each of the above-mentioned models was verified and validated by comparing with test data.
Document ID
20240004597
Acquisition Source
Marshall Space Flight Center
Document Type
Presentation
Authors
Alok Majumdar (Marshall Space Flight Center Redstone Arsenal, Alabama, United States)
Andre LeClair (Marshall Space Flight Center Redstone Arsenal, Alabama, United States)
Date Acquired
April 16, 2024
Publication Date
May 6, 2024
Publication Information
Subject Category
Spacecraft Propulsion and Power
Meeting Information
Meeting: 71st JANNAF Propulsion Meeting/14th Liquid Propulsion Meeting
Location: Oklahoma City, OK
Country: US
Start Date: May 6, 2024
End Date: May 10, 2024
Sponsors: United States Department of the Army, United States Department of the Air Force, United States Department of the Navy, National Aeronautics and Space Administration, Joint Army-Navy-NASA-Air Force (JANNAF)
Funding Number(s)
WBS: 012873.05.02.01.62
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
Keywords
Nodal Model
Pressurization
Chilldown

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