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| Temperature Measurements of Inductively Coupled Plasma Spheroidization by Using Argon Emission Spectroscopy |
| ZENG Hui, OU Dong-bin |
| Beijing Key Laboratory of Arc Plasma Application Equipment, China Academy of Aerospace Aerodynamics, Beijing 100074, China |
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Abstract Inductively coupled plasma (ICP) reactor is able to generate pure thermal plasma and realize sphericalization process of irregular powder particles by joule heating, demonstrating great application prospect in the aerospace industry. Gas temperature is a crucial parameter 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. Spatial-resolved gas temperature in the radial coordinate was measured at a cross section under the powder feed gun by combining argon emission spectroscopy and electric-driving scanning technique. The measured results show that gas temperatures in the radial coordinate showed a saddle-shape trend under no powder-in conditions and the temperature value in the center was (10 120±240) K, while the maximum temperature zone was positioned close to the core with specific values of (10 500±240) and (10 620± 240) K, respectively. There existed obvious temperature difference at the measured cross section under powder -in and no powder-in conditions. A maximum temperature difference under the two conditions was observed to be nearly 500 K and 400 K in the core and the maximum temperature zone respectively, indicating temperature drop of plasma flow when the injected particles were heated. The developed technique in this paper provide a mature method to quantitatively understand the two-dimensional spatial distribution of gas temperature in the inductively plasma spheroidization reactor.
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Received: 2019-05-16
Accepted: 2019-09-18
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