• Title/Summary/Keyword: Arc plasma

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Supersonic Mach Disk Characteristics in a Plasma Wind Tunnel (플라즈마 풍동의 초음속 마하 디스크 특성)

  • Chinnaraj, Rajesh Kumar;Oh, Philyong;Choi, Seongman
    • Journal of the Korean Society of Propulsion Engineers
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    • v.23 no.1
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    • pp.61-70
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    • 2019

  • A primary investigation on the underexpanded flow generated in a 0.4 MW class high enthalpy supersonic arc-heated plasma wind tunnel is conducted experimentally. The diameter and the position of the Mach disk from the nozzle exit is measured for overall pressure ratios ranging from 200 to 30. The empirical correlations for Mach disk diameter and position are determined which show very good agreement with experimental results.

  • https://doi.org/10.6108/KSPE.2019.23.1.061 인용 PDF KSCI

Stabilization of Plasma in a Three-Phase AC Plasma Generator (삼상 교류 플라즈마 발생의 안정화)

  • Lee, K.H.;Kim, K.S.;Lee, H.S.;Rim, G.H.
    • Proceedings of the KIEE Conference
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    • 2002.11a
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    • pp.209-211
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    • 2002

  • A simple-structured thermal plasma generator for waste gas treatment has been studied. The thermal plasma technology applied to waste treatment has undoubtedly gained high importance owing to its outstanding properties such as flexibility, compact reactor, and clean treatment. Moreover, the thermal plasma generated by ac power has some additional advantages such as simple electrode system and easy maintenance. A prototype 200kW class plasma generator with specifications of 10-30m/sec gas velocity and 3000-5000K temperature on the center just outside of the nozzle has been designed and tested. Case studies on heat transfer, heat flow, velocity distribution, and temperature distribution using a commercial simulation package show lots of flexibility in design. The experimental results from theprototype generator show that the ac thermal plasma is easily controlled by working gas flow once it is ignited. A stabilization condition is discussed with the data from monitoring arc voltage drops with respect to gas flow rate during the test.

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Separation Technology of Pure Zirconia from Zirconsand by the Ar-H2 Arc Plasma Fusion and Sulfuric Acid Leaching with Microwave Irradiation (Ar-H2플라즈마 건식제련과 마이크로웨이브침출을 통한 지르콘샌드로부터 고순도 지르코니아 분리)

  • Lee, Jeong-Han;Hong, Sung-Kil
    • Resources Recycling
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    • v.25 no.3
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    • pp.49-54
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    • 2016

  • In this study, zircon sand is separated into zirconia and silica by using the Ar-$H_2$ arc plasma refining. And then silica is removed from it by the microwave leaching method to produce a high pure zirconia. Plasma melting consist of two sequential processes; reduction process with Ar gas only followed by refining process with Ar-$H_2$ gas. After cooling in chamber. The solid phase obtained at $240^{\circ}C$ were found to be composed of 20% sulfuric acid solution. The solution was used as a leaching solution with microwave irradiation to obtain a high purity zirconia.

  • https://doi.org/10.7844/kirr.2016.25.3.49 인용 PDF KSCI

A Study on the Wear Behavior of Tetrahedral Amorphous Carbon Coatings Based on Bending Angles of the Filtered Cathodic Vacuum Arc with Different Arc Discharge Currents (자장여과아크소스의 자장필터 꺾임 각도와 아크방전전류에 따라 증착된 ta-C 코팅의 마모 거동 연구)

  • Kim, Won-Seok;Kim, Songkil;Jang, Young-Jun;Kim, Jongkuk
    • Tribology and Lubricants
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    • v.38 no.3
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    • pp.101-108
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    • 2022

  • The structure and properties of tetrahedral amorphous carbon (ta-C) coatings depend on the main process parameters and bending angles of the magnetic field filter used in the filtered cathodic vacuum arc (FCVA). During the process, it is possible to effectively control the plasma flux of carbon ions incident on the substrate by controlling the arc discharge current, thereby influencing the mechanical properties of the coating film. Furthermore, we can control the size and amount of large particles mixed during carbon film formation while conforming with the bending angle of the mechanical filter mounted on the FCVA; therefore, it also influences the mechanical properties. In this study, we consider tribological characteristics for filtered bending angles of 45° and 90° as a function of arc discharge currents of 60 and 100 A, respectively. Experiment results indicate that the frictional behavior of the ta-C coating film is independent of the bending angle of the filter. However, its sliding wear behavior significantly changes according to the bending angle of the FCVA filter, unlike the effect of the discharge current. Further, upon changing the bending angle from 45° to 90°, abrasive wear gets accelerated, thereby changing the size and mixing amount of macro particles inside the coating film.

  • https://doi.org/10.9725/kts.2022.38.3.101 인용 PDF KSCI HTML