Baseline characterization of the 30kW miniature arc jet facility mARC at NASA Ames

Nawaz, Anuscheh; Ho, Thanh S.; Philippidis, Daniel; MacDonald, Megan E.; McGlaughlin, Mark; Driver, David M.

doi:10.2514/6.2016-3819

Cited by 8 publications

(2 citation statements)

References 7 publications

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“…More importantly, the mass blowing effect and the gas-surface interaction of an ablating heat-shield are largely neglected as the heat is introduced volumetrically into the test model rather then by a surface heat flux. Regarding this, recent developments of small-scale arcjets [25][26][27][28][29][30] motivated their use as a preheating device for the sub-scale test models before being exposed to the hypersonic flow. This dual-facility concept was originally discussed in a reference [31].…”

Section: Introductionmentioning

confidence: 99%

Integration of Arc-jet in Impulse Facility for Hypervelocity Aerothermal Testing with Ablation

Chang

Joglekar

McGilvray

et al. 2023

AIAA SCITECH 2023 Forum

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Arc-jets and impulse facilities have been extensively used to investigate the flow physics of planetary re-entry, but they each address different aspects of re-entry flow-fields. This work presents a conceptual design of a dual-facility setup, utilising an arc-jet as a model preheating device in the impulse test facility. This novel preheating apparatus will replicate realistic ablation coupling effects in hypervelocity flows. This paper outlines the major challenges and key considerations for the system integration of arc-jet in the T6 Stalker Tunnel. A small-scale arc-jet facility, OPG1, is currently being developed at the University of Oxford to test the plasma generator, model movement system, and sub-components for the expansion tube testing. Analyses were performed to examine the thermal and structural loads on the model movement system exposed to both plasma and hypervelocity flow. The results showcased that the model movement system will effectively serve dual-facility operations.

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Section: Introductionmentioning

confidence: 99%

Integration of Arc-jet in Impulse Facility for Hypervelocity Aerothermal Testing with Ablation

Chang

Joglekar

McGilvray

et al. 2023

AIAA SCITECH 2023 Forum

View full text Add to dashboard Cite

show abstract

“…They also require a high cost of operation and often have restricted availability for testing that isn't supported by a large research project, as pointed out in Ref [9]. Small-scale arc-jets allow for testing of new diagnostics or preliminary screening for material samples before their respective application in a large facility [10][11][12]. Small-scale facilities can achieve fast turn-around and relatively low cost operation and can be operated with fewer personnel.…”

Section: Introductionmentioning

confidence: 99%

Development of Small Scale Arc-jet Facility OPG1

Hermann

Chang

Schaefer

et al. 2023

AIAA SCITECH 2023 Forum

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A small-scale thermal arc-jet facility based on a 21.5 kW tungsten inert gas welding power supply has been developed. The design and simulations are presented here. The plasma generator is situated inside a vacuum vessel forming an Argon plasma with a mass flow rate of approximately 0.2 g/s. The vessel is evacuated by a series of pumps providing sufficient suction to keep the vessel below 125 Pa during continuous operation. The system is designed with regards to heat transfer and vacuum performance with the goal of keeping component temperatures pressures below critical values to prevent material failure and enable adequate vacuum. The thermal design of the plasma generator includes a water cooling circuit which keeps the copper anode below melting temperatures. A viscous reacting 2D axisymmetric simulation is carried out using Eilmer4 simulating the nozzle flow including the stagnation chamber and the free jet impinging onto a 40 mm diameter sphere-cone model. The simulations predict a maximum heat flux on the model surface of approximately 800 kW/m 2 when a plasma total temperature of 7400 K is assumed.

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Uncertainty Analysis of Slug Calorimeters in the NASA HyMETS Arc-Jet Facility

Brune,

Morrow

2024

Journal of Thermophysics and Heat Transfer

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The objective of this work is to perform an uncertainty analysis of the deduced stagnation heat flux environment on a slug calorimeter in the Hypersonic Materials Environmental Test System arc-jet facility located at NASA Langley Research Center. Analytical solutions are developed for boundary-value problems on the slug sensor accounting for nonideal effects, including spatial variation in the slug heat flux, multidimensional thermal conduction, and backface losses, which depart from the state-of-the-art method derived from the American Society of Testing and Materials. The analytical solutions are compared and optimized to experimental backface slug thermocouple data for a high- and low-enthalpy test condition. The results indicate that the epistemic uncertainty of the deduced stagnation heat flux on the slug calorimeter is at most [Formula: see text] for both conditions. Using a numerical approach to evaluate the aleatory uncertainty component in the slug stagnation heat flux, there is a compromise between the sample size and filter frequency of slug backface thermal data points when evaluating the deduced stagnation heat flux standard deviation. The total (mixed) uncertainty in the deduced stagnation heat flux is determined to be up to [Formula: see text], which is at least a 60% reduction from the standard uncertainty used in the state-of-the-art method.

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Baseline characterization of the 30kW miniature arc jet facility mARC at NASA Ames

Cited by 8 publications

References 7 publications

Integration of Arc-jet in Impulse Facility for Hypervelocity Aerothermal Testing with Ablation

Integration of Arc-jet in Impulse Facility for Hypervelocity Aerothermal Testing with Ablation

Development of Small Scale Arc-jet Facility OPG1

Uncertainty Analysis of Slug Calorimeters in the NASA HyMETS Arc-Jet Facility

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