Comprehensive Characterization of Test Flows in 110-kW Inductively-Coupled-Plasma Heater

Fujita, Kazuhisa; Suzuki, Toshiyuki; Mizuno, Masahito; Fujii, Keisuke

doi:10.2514/6.2008-1254

Cited by 5 publications

(8 citation statements)

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“…The present analysis method to predict the freestream conditions of the ICP wind tunnel was validated against experimental data obtained by Fujita et al [4]. In their work [4], the emission spectra from the flows in the test chamber of the ICP wind tunnel were measured.…”

Section: Flowfield Analysismentioning

confidence: 98%

“…Two cases are considered for this purpose: In case 2, 1% molecular oxygen is included by mole. The amount of molecular oxygen so included is determined to give the same level of the atomic oxygen near the graphite rod as the one measured by Fujita et al [4]; In case 3, 21% molecular oxygen is given by mole. This case represents a hypothetical one in which no replacement of the ambient gas inside the test chamber is made.…”

Section: Effect Of Atomic Oxygen Remaining In Test Chambermentioning

confidence: 99%

“…Accordingly, in our previous study, the amount of atomic oxygen remaining in the test section was assumed to be negligibly small. However, based on the radiation emission spectroscopic data [4] taken in the test chamber with the same replacement technique, the mole fraction of the atomic oxygen remaining in the test section was found to be a maximum of 0.1%. Because whether such an amount of atomic oxygen could affect the amount of mass loss of graphite is unknown, a coupled calculation will be made additionally by accounting for the presence of atomic oxygen in the test chamber.…”

Section: Experimental Configurationsmentioning

confidence: 99%

“…In their work [4], the emission spectra from the flows in the test chamber of the ICP wind tunnel were measured. The measurements were made at 372 mm from the coil center (at 5 mm away from the graphite test piece surface).…”

Section: Flowfield Analysismentioning

confidence: 99%

“…In addition, the surface oxidation process is incorporated to examine a possible impact on the mass loss due to the impurities included in the ICP freestream flows. Based on the spectroscopic measurement made by Fujita et al [4], a small amount of impurities (e.g., O and H 2 O) was observed in the high-temperature nitrogen flows even if the test chamber was evacuated before the wind-tunnel operation. Thus, the measured mass loss of graphite in the ICP wind-tunnel operation might be attributed not only to the nitridation but also to the oxidation by atomic oxygen, leading to an erroneous probability value for nitridation reaction.…”

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confidence: 99%

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Experimental Study of Graphite Ablation in Nitrogen Flow, Part II: Further Numerical Analysis

Suzuki

Fujita

Sakai

2010

Journal of Thermophysics and Heat Transfer

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The ablative behavior of graphite heated in an inductively coupled plasma wind tunnel is analyzed using an integrated computational method to examine the probability value of nitridation reaction occurring at graphite surface. In this method, the plasma torch freestream condition at the entrance of the test chamber is evaluated by calculating the flows in the plasma torch. The thermal response of the graphite test piece is calculated by loosely coupling the thermochemical nonequilibrium fluid dynamics code and two-dimensional heat conduction equation solver using the freestream condition so valuated. Using a computational tool, surface contours of the graphite test piece at several time steps are calculated by varying the probability value of nitridation reaction and are compared with those measured in the heating test. The effect of impurities remaining in the test chamber is also taken into account. As a result of the study, it is suggested that a probability value of 0.003 for nitridation reaction is reasonable to explain the amount of mass loss of the graphite test piece in the heating test. Nomenclature c p = specific heat at constant pressure, J=kg K J s = mass flux of species, kg=m 2 s k = surface reaction velocity, m=s M s = molecular weight of species s, kg=mol R = universal gas constant, 8:314 J=mol K r = mass-loss rate, kg=s S = recession, m s = mass-loss rate, m=s T = temperature, K = reaction probability = density, kg=m 3 Subscripts g = graphite nit = nitridation reaction oxi = oxidation reaction

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Section: Flowfield Analysismentioning

confidence: 98%

Section: Effect Of Atomic Oxygen Remaining In Test Chambermentioning

confidence: 99%

Section: Experimental Configurationsmentioning

confidence: 99%

Section: Flowfield Analysismentioning

confidence: 99%

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confidence: 99%

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