NDLI: Characterization of side load phenomena using measurement of fluid/structure interaction

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Characterization of side load phenomena using measurement of fluid/structure interaction

Content Provider	NASA Technical Reports Server (NTRS)
Author	DAgostino, Mark Brown, Andrew M. Reed, Darren Keanini, Russell Ruf, Joseph
Copyright Year	2002
Description	During ground-tests of most production rocket engines over the last 30 years, large asymmetric transient side loads coming from the nozzle and related steady-state vibrational loads within the nozzle have been measured. The widely varying magnitude of these loads has been large enough to fail interfacing components as well as nozzles in these engines. This paper will discuss a comprehensive test and analysis program that has been undertaken to develop a methodology to accurately predict the character and magnitude of this loading. The project to-date has incorporated analytical modeling of both the fluid flow and the nozzle structure and testing of both full-scale and sub-scale rocket nodes. Examination of the test data indicates that one of the two-nodal diameter structural modes may be interacting with flow separation from the nozzle inside-wall in a self-excited or aeroelastic vibration phenomenon. If verified, this observation will be used to develop a methodology for design and analysis. A fuller understanding of the characteristics of this vibration will provide an increase in the accuracy and confidence of side load predictions, which will be critical for the successful construction of the next generation of low-cost, reliable rocket engines.
File Size	729313
Page Count	11
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_20030005454
Archival Resource Key	ark:/13960/t54f6r50h
Language	English
Publisher Date	2002-06-15
Access Restriction	Open
Subject Keyword	Structural Mechanics Rocket Nozzles Nozzle Geometry Nozzle Walls Vibrational Stress Fluid Flow Rocket Engines Models Aeroelasticity Separated Flow Steady State Loads Forces Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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