• Title/Summary/Keyword: Plasma Wind Tunnel

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Wind Tunnel Test of 2D Model for Plasma Flow Control using DBD Plasma Actuator (DBD 플라즈마 구동기를 이용한 2차원 모델의 플라즈마 유동제어 풍동시험)

  • Yun, Su-Hwan;Kim, Tae-Gyu
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2012.05a
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    • pp.527-528
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    • 2012
  • DBD (Dielectric Barrier Discharge) plasma actuator was designed for aerodynamic drag reduction using plasma flow control, and the drag reduction was measured by wind-tunnel tests using 2D test model. At the zero wind velocity, the plasma flow control had no effect on the drag reduction because the flow separation and surface friction drag were not occurred. At the wind velocity of 2m/s, 9.7% of drag was reduced by the flow separation control. The drag reduction decreased as the wind velocity increased.

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Performance Characteristics of 0.4 MW Class Arc-Heated Plasma Wind Tunnel (0.4 MW 급 아크가열 플라즈마 풍동의 성능특성)

  • Oh, Philyong;Chinnaraj, Rajesh Kumar;Hong, Seong Min;Shin, Eui Sup;Choi, Seong Man
    • Journal of the Korean Society of Propulsion Engineers
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    • v.22 no.5
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    • pp.115-124
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    • 2018
  • Thermal protection materials (TPMs) are very crucial for the survival of any re-entry space vehicles. One of the systems used for rigorous validation of TPMs is an enhanced Huel type segmented arc-heated plasma wind tunnel. A 0.4 MW class arc-heated plasma wind tunnel has been constructed at Chonbuk National University which is capable of producing high enthalpy supersonic flow. In this paper we have studied the characteristics of plasma flow according to power and mass flow parameters.

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.

A Study on Improvement of the Ablation Resistance of Two Types of the Carbon/Carbon Composites by HfC Coating (하프늄카바이드 코팅을 통한 2종형상의 탄소/탄소복합재의 내삭마성 향상연구)

  • Kang, Bo-Ram;Kim, Ho-Seok;Oh, Phil-Yong;Choi, Seong-Man
    • Composites Research
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    • v.33 no.4
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    • pp.205-212
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    • 2020
  • In this study, HfC was coated on two types of carbon/carbon composites coated with SiC by vacuum plasma spraying(VPS). The experiment was performed using a plasma wind tunnel with heat flux of 5.06 MW/㎡ for 120 s heat flux before and after the coating. The mass ablation rate was calculated through the mass change before and after the test, and the length change was measured by using calipers and high speed camera. The oxidation/ablation behavior were observed by FE-SEM with EDS analysis of the specimens cross section. The plasma wind tunnel test results showed that the coated specimens had low weight loss and length change, and high oxidation/ablation resistance. However, two types of the specimens tested under the same conditions were different in the ablation behavior and ablation rate, and it was evaluated that the cylindrical type had higher oxidation/ablation resistance.

Conceptual design of electrical, water and gas utilities for MW class plasma wind tunnel in CBNU (전북대학교 MW급 플라즈마 풍동용 공통지원설비 개념설계)

  • Choi, Chea-Hong;Seo, Jun-Ho;Hong, Bong-Guen;Choi, Seong-Man
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2010.11a
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    • pp.784-785
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    • 2010
  • The high enthalpy plasma research center in Chonbuk national university is under construction for MW class plasma wind tunnel. Four types of plasma equipment will be installed in the research center. The equipments are 1set of 0.4 MW class enhanced Huels type plasma equipment, 1 set of 2.4 MW class enhanced Huels type plasma quipment, 1 set of 60 kW RF plasma equipment and 1 set of 200 kW RF plasma equipment. And electrical, water and gas utilities to assistant plasma equipments are under construction.

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Aerodynamic Drag Reduction in Cylindrical Model Using DBD Plasma Actuator (DBD 플라즈마 구동기를 이용한 원통모델의 공기저항저감)

  • Lee, Changwook;Sim, Ju-Hyeong;Han, Sunghyun;Yun, Su Hwan;Kim, Taegyu
    • Journal of the Korean Society of Propulsion Engineers
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    • v.19 no.1
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    • pp.25-32
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    • 2015
  • Dielectric barrier discharge (DBD) plasma actuator was designed to reduce aerodynamic drag in a cylindrical model and wind tunnel test was performed at various wind velocities. In addition, computational fluid dynamics (CFD) analysis and flow visualization were used to investigate the effect of the plasma on the flow stream in the cylinderical model. At low wind velocity, the plasma actuator had no effects because flow separation did not appear. The aerodynamic drag was reduced by 14% at 14 m/s and by 27% at 17 m/s, respectively. It was confirmed by CFD analysis and flow visualization that the DBD plasma actuator decreased in pressure difference around the cylindrical model, thus decreasing the magnitude of wake vortex.

Study of microstructure of carbon-based materials in plasma wind tunnel testing

  • Kang, Bo-Ram;Lim, Hyeon-Mi;Oh, Phil-Yong;Hong, Bong Guen
    • Proceedings of the Korean Vacuum Society Conference
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    • 2016.02a
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    • pp.200.2-200.2
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    • 2016
  • Carbon-based materials have been known as ablative material and have been used for thermal protection systems. Ablation is an erosive phenomenon that results in thermochemical and thermomechanical changes on materials. Ablation resistance is one of the key properties that determines performance and life-time of the thermal protection material under ablative conditions. In this study, ablation properties of graphite, 3-dimensional (C/C) composites (needle-punched type and rod type) were investigated byusing a plasma wind tunnel which produce a supersonic plasma flow from a segmented arc heater with the power level of 0.4 MW. The mass losses and surface roughness changes which contain main result of the ablation are measured. A morphological analysis ofthe carbon-based materials, before and after the ablation test, are performed through field emission scanning electron microscopy (FE-SEM) and non-contact 3D surface measuring system. Electronic balance and a portable surface roughness tester were used for evaluation of the recession and mass loss of the test samples.

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Experimental Analysis of a Supersonic Plasma Wind Tunnel Using a Segmented Arc Heater with the Power Level of 0.4 MW (0.4 MW 급 분절형 아크 히터를 이용한 초음속 플라즈마 풍동 특성 실험)

  • Kim, Min-Ho;Lee, Mi-Yeon;Kim, Jeong-Soo;Choi, Chea-Hong;Seo, Jun-Ho;Moon, Se-Yeon;Hong, Bong-Guen
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.41 no.9
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    • pp.700-707
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    • 2013
  • Experimental analyses on a supersonic plasma wind tunnel of CBNU (Chonbuk National University) were carried out. In these experiments, a segmented arc heater was employed as a plasma source and operated at the gas flow rates of 16.3 g/s and the total currents of 300 A. The input power reached ~350 kW with the torch efficiency of 51.4 %, which is defined as the ratio of total exit enthalpy to the input power. The pressure of plasma gas in the arc heater was measured up to 4 bar while it was down to ~45 mbar in a vacuum chamber through a Laval nozzle. During this conversion process, the generated supersonic plasma was expected to have a total enthalpy of ~11 MJ/kg from the measured input power and torch efficiency. In addition to the measurement of total enthalpy, a cone type probe was inserted into the supersonic plasma flow in order to estimate the angle between shock layer and surface of the probe. From these measurements, the temperature and the Mach number of the supersonic plasma were predicted as ~2,950 K and ~3.7, respectively.

Analysis of the Effects of SD Plasma on Aerodynamic Drag Reduction of a High-speed Train

  • Lee, Hyung-Woo;Kwon, Hyeok-Bin
    • Journal of Electrical Engineering and Technology
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    • v.9 no.5
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    • pp.1712-1718
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    • 2014
  • Experimental analysis according to the plasma actuator design variables was performed in order to verify the effects of sliding discharge plasma on aerodynamic drag reduction of a high-speed train. For the study, sliding discharge plasma actuator and high-frequency, high-voltage power supply were developed and experimented to figure out the best design variables for highest ionic wind velocity which could reduce the drag force. And then, 5% reduced-scale model of a high-speed train was built for wind tunnel test to verify it. From the results, it was confirmed that sliding discharge plasma had contribution to reduce the drag force and it had the potential to be applied to real-scale trains.

A Study on Surface Properties of Ablative Materials from 0.4MW Arc-Heated Wind Tunnel Test (0.4MW 아크 가열 풍동 시험을 통한 삭마 재료의 표면 특성 연구)

  • Kim, Nam Jo;Oh, Philyong;Shin, Eui Sup
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.43 no.12
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    • pp.1048-1053
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    • 2015
  • Ablative materials in a thermal protection system for atmospheric re-entry suffers from the most severe heat fluxes and temperatures, which induces surface recession in the thickness direction. In this paper, a 0.4MW arc-heated wind tunnel is operated to test for ablative materials, and a non-contact three-dimensional surface measuring system is used to evaluate the different surface characteristics of them. In particular, by postprocessing the three-dimensional image data, the surface roughness and recession of ablative materials can be calculated before and after the wind tunnel test. Moreover, the surface properties are analyzed quantitatively by comparing volume and mass losses of the test specimens.