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Pressure distribution in a converging-diverging nozzle during two-phase choked flow of subcooled nitrogenChoked flow rates and axial pressure distributions were measured for subcooled nitrogen in a converging-diverging nozzle with a constant area section in the throat region. Stagnation pressures ranged from slightly above saturation to twice the thermodynamic critical pressure. Stagnation temperatures ranged from 0.75 to 1.03 times the thermodynamic critical temperature. The choking plane is at the divergence end of the constant area throat section. At high stagnation pressures the fluid stays liquid well into the constant area throat region; at near saturation stagnation pressures it appears that vaporization occurs at or before the entrance to the constant area throat region. The throat-to-stagnation pressure ratio data exhibits an anomalous flat region, and this anomaly is related to the two-phase process. The fluid is metastably all liquid below the saturation pressure.
Document ID
19750018234
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Simoneau, R. J. (NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
September 3, 2013
Publication Date
January 1, 1975
Subject Category
Fluid Mechanics And Heat Transfer
Report/Patent Number
NASA-TM-X-71762
E-8415
Accession Number
75N26306
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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