Gas temperature are crucial parameters for inductively coupled plasma spheroidization. Spatial resolved temperature measurement of the high-temperature flow field in the plasma reactor provide quantitatively basis and evidence for theoretical study of plasma spheroidization and industrial methodology optimization. It leads to research gap in flow diagnostics for high-temperature inductively plasma flow owing to the inapplicability of conventional diagnostic techniques. This paper presents in-situ and non-intrusive diagnostics for argon plasma flow in the inductively coupled plasma spheroidization based on optical emission spectroscopy and electric scanning technique. Two-dimensional spatial temperature in the radial direction was measured at a cross section under the powder feed gun. Gas temperature in the center was 10120 K±240K, while the maximum temperature zone was positioned close to the core with specific values of 10500 K±240K and 10620 K±240K, respectively
Multi-species measurements of N2O, CO, NO within an ammonium dinitramide (ADN) based thruster are presented using quantum cascade lasers, while gas temperature are obtained using near-infrared H2O two-line thermometry. ADN monopropellant represents a new generation of green propellant for spacecraft propulsion. Measurements using the developed mid-infrared diagnostic system provide an access to characterize the combustion process inside the ADN based thruster, while theoretical study of ADN monopropellant combustion is still under study. Both steady-state firing and pulse-mode firing for ADN based thruster operation are measured in the present experiments. Results of multispecies concentration agree well with the mechanism of the combustion process and divide the whole process into decomposition stage and combustion stage. Reaction (R1, NH4N( NO2)2→ NH3+N2O+HNO3 ) is the primary reaction branch as N2O generation is much higher and faster than NO generation in decomposition stage at the measured position. To the author’s knowledge, this work represents the first multispecies simultaneous measurements in an actual ADN based thruster using mid-infrared laser absorption spectroscopy. The time-resolved multispecies results aid in an improved understanding of the ADN monopropellant combustion and demonstrate mid infrared diagnostic technique’s practicality for small-sized ADN based thruster.
This paper reports the laser absorption measurements of atomic oxygen in the FD04 arc-heater at China Academy of Aerospace Aerodynamics (CAAA). An atomic oxygen absorption line at 777.19 nm is utilizied for detecting the population of electronically excited oxygen atom in an air plasma flow. A scanned-wavelength direct absorption mode is used in this study. The laser is scanned in wavelength across the absorption feature at a rate of 200 Hz. Under the assumption of thermal equilibrium, time-resolved temperature measurements are obtained on one line-of-sight in the arc-heater. The good agreement of the temperature inferred from the sonic throat method suggests the equilibrium assumption is valid. These results illustrate the feasibility of the diode laser sensors for flow parameters in high enthalpy arc-heated facilities.
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