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Flow Characterization Studies of the 10-MW TP3 Arc-Jet Facility: Probe SweepsThis paper reports computational simulations and analysis in support of calibration and flow characterization tests in a high enthalpy arc-jet facility at NASA Ames Research Center. These tests were conducted in the NASA Ames 10-MW TP3 facility using flat-faced stagnation calorimeters at six conditions corresponding to the steps of a simulated flight heating profile. Data were obtained using a conical nozzle test configuration in which the models were placed in a free jet downstream of the nozzle. Experimental surveys of arc-jet test flow with pitot pressure and heat flux probes were also performed at these arc-heater conditions, providing assessment of the flow uniformity and valuable data for the flow characterization. Two different sets of pitot pressure and heat probes were used: 9.1-mm sphere-cone probes (nose radius of 4.57 mm or 0.18 in) with null-point heat flux gages, and 15.9-mm (0.625 in) diameter hemisphere probes with Gardon gages. The probe survey data clearly show that the test flow in the TP3 facility is not uniform at most conditions (not even axisymmetric at some conditions), and the extent of non-uniformity is highly dependent on various arc-jet parameters such as arc current, mass flow rate, and the amount of cold-gas injection at the arc-heater plenum. The present analysis comprises computational fluid dynamics simulations of the nonequilibrium flowfield in the facility nozzle and test box, including the models tested. Comparisons of computations with the experimental measurements show reasonably good agreement except at the extreme low pressure conditions of the facility envelope.
Document ID
20180001513
Document Type
Conference Paper
Authors
Goekcen, Tahir (Analytical Mechanics Associates, Inc. Moffett Field, CA, United States)
Alunni, Antonella I. (Analytical Mechanics Associates, Inc. Moffett Field, CA, United States)
Date Acquired
February 27, 2018
Publication Date
June 13, 2016
Subject Category
Aeronautics (General)
Fluid Mechanics and Thermodynamics
Report/Patent Number
ARC-E-DAA-TN32374
Meeting Information
AIAA Thermophysics Conference(Washington, DC)
Funding Number(s)
CONTRACT_GRANT: NNA15BB15C
Distribution Limits
Public
Copyright
Public Use Permitted.

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IDRelationTitle20190000376See AlsoFlow Characterization Studies of the 10-MW TP3 Arc-Jet Facility: Probe Sweeps