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Study of Anti-Vortex Baffle Effect in Suppressing Swirling Flow in LOX TankExperimental results describing the hydraulic dynamic pump transfer matrix (Yp) for a cavitating J-2X oxidizer turbopump inducer+impeller tested in subscale waterflow are presented. The transfer function is required for integrated vehicle pogo stability analysis as well as optimization of local inducer pumping stability. Dynamic transfer functions across widely varying pump hydrodynamic inlet conditions are extracted from measured data in conjunction with 1D-model based corrections. Derived Dynamic transfer functions are initially interpreted relative to traditional Pogo pump equations. Water-to-liquid oxygen scaling of measured cavitation characteristics are discussed. Comparison of key dynamic transfer matrix terms derived from waterflow testing are made with those implemented in preliminary Ares Upper Stage Pogo stability modeling. Alternate cavitating pump hydraulic dynamic equations are suggested which better reflect frequency dependencies of measured transfer matrices.
Document ID
20120002810
Acquisition Source
Marshall Space Flight Center
Document Type
Conference Paper
Authors
Yang, H. Q. (CFD Research Corp. Huntsville, AL, United States)
Peugeot, John (NASA Marshall Space Flight Center Huntsville, AL, United States)
Date Acquired
August 25, 2013
Publication Date
December 5, 2011
Subject Category
Spacecraft Design, Testing And Performance
Report/Patent Number
M11-0641
Meeting Information
Meeting: JANNAF 8th Modeling and Simulation Subcommittee Meeting
Location: Huntsville, AL
Country: United States
Start Date: December 5, 2011
End Date: December 9, 2011
Sponsors: Department of the Army, NASA Headquarters, Department of the Air Force, Department of the Navy
Distribution Limits
Public
Copyright
Public Use Permitted.

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