摘要 :
Inductively coupled plasma wind tunnels accurately replicate the harsh conditions that hypersonic vehicles experience during the atmospheric reentry phase. With the ability to reproduce aerothermal heating and the chemistry of hyp...
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Inductively coupled plasma wind tunnels accurately replicate the harsh conditions that hypersonic vehicles experience during the atmospheric reentry phase. With the ability to reproduce aerothermal heating and the chemistry of hypersonic flight, phenomena such as gas-surface interactions, heat shield ablation response, aero-optics, and non-equilibrium plasma can be investigated in a pristine and flexible test environment. This paper describes the new Plasmatron X inductively coupled plasma (ICP) facility developed by the Center for Hypersonics & Entry Systems Studies (CHESS) at the University of Illinois Urbana-Champaign. At 350 kW, Plasmatron X is currently the largest ICP facility in the United States, which allows near-continuous operation, dedicated to aerothermal testing for hypersonic flight and reentry environments. A description of the facility's unique capabilities, characterization of the operating conditions, and a survey of the aerothermal test environment are provided, focusing on cold-wall stagnation-point heat flux and stagnation pressure characterization, as well as plasma jet unsteadiness through high-speed imaging under different operating conditions.
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摘要 :
During atmospheric re-entry, carbon microstructures evolve due to exposure to rapidly oxidizing environments. The evolution of these structures can fundamentally change intrinsic material properties and therefore performance. In t...
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During atmospheric re-entry, carbon microstructures evolve due to exposure to rapidly oxidizing environments. The evolution of these structures can fundamentally change intrinsic material properties and therefore performance. In this study, we use molecular dynamics to investigate the sensitivity of carbon fiber and amorphous carbon thermal conductivities to defects introduced as a consequence of these environmental factors. Pristine microstructures are first evaluated, followed by counterparts with the presence of impurities, oxygen, and etch pitting. Findings indicate diminished thermal transport capabilities of these materials for all defect types studied, and differences in conductivity of up to 50% as compared to pristine counterparts. We also conclude that etch pitting has a meaningful impact on these materials1 thermal response from the early stages of formation. Results found in this study act to advance fundamental understanding of these materials and serve as a basis for larger scale simulations.
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摘要 :
Characterization of the inductively coupled plasma (ICP) torch at the Plasmatron X facility developed by the Center for Hypersonics & Entry Systems Studies (CHESS) was performed by means of optical emission spectroscopy (OES). OES provides a noninvasive method of identifying both atomic and molecular species within the plasma jet without physically perturbing the flow. Additionally, experimental spectra can be compared to simulated spectra to provide estimates of the gas temperature. In this work, we present the preliminary results of a spectroscopic characterization campaign of the newly commissioned 350 kW ICP wind tunnel, identifying the chemical composition and determining the gas temperatures as a function of the tunable parameter spaces (i.e., applied power and static pressure)....
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Characterization of the inductively coupled plasma (ICP) torch at the Plasmatron X facility developed by the Center for Hypersonics & Entry Systems Studies (CHESS) was performed by means of optical emission spectroscopy (OES). OES provides a noninvasive method of identifying both atomic and molecular species within the plasma jet without physically perturbing the flow. Additionally, experimental spectra can be compared to simulated spectra to provide estimates of the gas temperature. In this work, we present the preliminary results of a spectroscopic characterization campaign of the newly commissioned 350 kW ICP wind tunnel, identifying the chemical composition and determining the gas temperatures as a function of the tunable parameter spaces (i.e., applied power and static pressure).
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摘要 :
Characterization of the inductively coupled plasma (ICP) torch at the Plasmatron X facility developed by the Center for Hypersonics & Entry Systems Studies (CHESS) was performed by means of optical emission spectroscopy (OES). OES provides a noninvasive method of identifying both atomic and molecular species within the plasma jet without physically perturbing the flow. Additionally, experimental spectra can be compared to simulated spectra to provide estimates of the gas temperature. In this work, we present the preliminary results of a spectroscopic characterization campaign of the newly commissioned 350 kW ICP wind tunnel, identifying the chemical composition and determining the gas temperatures as a function of the tunable parameter spaces (i.e., applied power and static pressure)....
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Characterization of the inductively coupled plasma (ICP) torch at the Plasmatron X facility developed by the Center for Hypersonics & Entry Systems Studies (CHESS) was performed by means of optical emission spectroscopy (OES). OES provides a noninvasive method of identifying both atomic and molecular species within the plasma jet without physically perturbing the flow. Additionally, experimental spectra can be compared to simulated spectra to provide estimates of the gas temperature. In this work, we present the preliminary results of a spectroscopic characterization campaign of the newly commissioned 350 kW ICP wind tunnel, identifying the chemical composition and determining the gas temperatures as a function of the tunable parameter spaces (i.e., applied power and static pressure).
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