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A combined Eulerian-Lagrangian two-phase analysis of the SSME HPOTP nozzle plug trajectoriesAs a result of high cycle fatigue, hydrogen embrittlement, and extended engine use, it was observed in testing that the trailing edge on the first stage nozzle plug in the High Pressure Oxygen Turbopump (HPOTP) could detach. The objective was to predict the trajectories followed by particles exiting the turbine. Experiments had shown that the heat exchanger soils, which lie downstream of the turbine, would be ruptured by particles traveling in the order of 360 ft/sec. An axisymmetric solution of the flow was obtained from the work of Lin et. al., who used INS3D to obtain the solution. The particle trajectories were obtained using the method of de Jong et. al., which employs Lagrangian tracking of the particle through the Eulerian flow field. The collision parameters were obtained from experiments conducted by Rocketdyne using problem specific alloys, speeds, and projectile geometries. A complete 3-D analysis using the most likely collision parameters shows maximum particle velocities of 200 ft/sec. in the heat exchanger region. Subsequent to this analysis, an engine level test was conducted in which seven particles passed through the turbine but no damage was observed on the heat exchanger coils.
Document ID
19910001565
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Garcia, Robert (Scientific Research Associates, Inc., Glastonbury CT., United States)
Mcconnaughey, P. K. (Scientific Research Associates, Inc., Glastonbury CT., United States)
Dejong, F. J. (NASA Marshall Space Flight Center Huntsville, AL, United States)
Sabnis, J. S. (NASA Marshall Space Flight Center Huntsville, AL, United States)
Pribik, D. (Rockwell International Corp. Canoga Park, CA., United States)
Date Acquired
September 6, 2013
Publication Date
September 1, 1989
Publication Information
Publication: NASA, Ames Research Center, NASA Computational Fluid Dynamics Conference. Volume 2: Sessions 7-12
Subject Category
Aerodynamics
Accession Number
91N10878
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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