• Title/Summary/Keyword: Plasma jet ignition

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A Development of Plasma Jet to Realize Ultra Lean Burn (초희박 연소를 실현하기 위한 플라즈마 제트의 개발)

  • 오병진;박정서;김문헌
    • Transactions of the Korean Society of Automotive Engineers
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    • v.6 no.1
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    • pp.213-221
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    • 1998
  • The investigation regarding the ignition system of a plasma jet explored by using a constant volume vessel. The purpose of this study is to elucidate relation between the characteristics of the configuration and jet ejection of plasma jet plug, when the sub energy were supplied at plasma jet ignition system. From the results of a visualization by the schlieren system, the jut ejection for plasma jet ignition are depended on the jet plug configuration and sub energy, but the configuration of plasma jet plug is more influenced than the sub energy on the plasma jet ejection. And the plasma jet ignition strongly influences upon the combustion enhancement than the conventional spark ignition.

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Combustion Characteristicsof Plasma JetIgnition for Different Swirl Velocity in a Constant Volume Vessel (정적 연소기내의 스월 속도 변화에 따른 플라즈마 제트 점화의 연소특성)

  • 김문헌;박정서;이주환
    • Transactions of the Korean Society of Automotive Engineers
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    • v.9 no.2
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    • pp.75-83
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    • 2001
  • This paper presents the evaluation of combustion characteristics of sing-hole plasma jet ignitions in comparison with conventional spark ignition for variable of swirl velocity. Plasma jet plugs are three types according to ejecting directions : center of chamber, positive and negative swirl flow direction. Experiments are carried out for equivalent ratio 1.0 of LPG-air mixture in a constant volume cylindrical vessel. Not only the flame propagation is photographed at intervals, but the pressure variation in the combustion chamber is also recorded throughout the entire combustion process. The results show that the plasma jet ignitions and spark ignition enhance the overall combustion rate by increasing the swirl velocity. The dependence of the combustion rate swirl velocity leade to the conclusion that the placma jet plug, which ejects plasma jet to the cwnter of combustion chamber is the most desirable ignitor than other plugs.

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Evaluation of Heat Loss by Means of Plasma Jet Ignition during Combustion Duration in the Constant Volume Vessel (정적연소실내에서의 플라즈마 제트 점화에 대한 연소기간중의 열손실산정)

  • 김문헌;문경태;박정서;김홍성
    • Transactions of the Korean Society of Automotive Engineers
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    • v.11 no.2
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    • pp.96-103
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    • 2003
  • In this paper, the heat loss to the constant volume vessel wall was investigated using instantaneous heat flux sensor, schlieren visualization, pressure rise curve. And the heat loss characteristics of plasma jet ignition were compared with conventional spark ignition. In case of plasma jet ignition, the flame kernel moves toward the center of combustion vessel in the initial period of combustion, and the flame surface spread out to the vessel wall. However, in case of conventional spark ignition, the flame surface contact with combustion vessel wall in the initial period of combustion. As a result, heat loss in the combustion duration for conventional spark ignition increase faster than that of plasma jet ignition. And the combustion enhancement rate of plasma jet ignition is higher than that of conventional spark ignition, and it was found that the heat loss rate is inversely proportional to the combustion enhancement rate.

The Experimental Research On The Electrical Characteristics For The Ignition Of Plasma Jet Using The Advance Discharge Of High Frequency Voltage With Attenuation (감쇠파 고주파전압의 선행방전을 이용한 Plasma jet의 전기적 기동특성에 대한 실험적 연구)

  • Choon Saing Jhoun
    • 전기의세계
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    • v.21 no.4
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    • pp.27-38
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    • 1972
  • This paper discusses the characteristics about the ignition of D.C. main discharge is a plasma jet generator, manufactured for trial as non-transferred type, when the electrical energy appropriate to the ignition is supplied to the gap between the electrodes by using advance discharge of attenuating high frequency voltage generated by a high frequency oscillator with mercury spark gap. These characteristics are under the influences of (a) the length of mercury gap in high frequency oscillator and the quantity of hydrogen flow supplied to it, (b) the condenser capacity of the high frequency oscillator circuit, (c) the length of plasma jet torch in D.C. main discharge circuit and the quantity of argon flow supplied to it, (d) the circuit constants of D.C. main discharge circuit. The results for these characteristics, obtained by this research, are considered to be helpful to the designs for the ignition of a plasma jet as well as the welding arc stabilizer by high frequency discharge and the high frequency arc welder.

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PROPAGATION PROCESSES OF NEWLY DEVELOPED PLASMA JET IGNITER

  • Ogawa, Masaya;Sasaki, Hisatoshi;Yosgida, Koji;Shoji, Hideo;Tanaka, Hidenori
    • International Journal of Automotive Technology
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    • v.3 no.1
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    • pp.9-16
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    • 2002
  • In plasma jet ignition, combustion enhancement effects occur toward the plasma jet issuing direction. Therefore, when the igniter is attached at the center of a cylindrically shaped combustion chamber, plasma jet should issue toward the round combustion chamber wall. The plasma jet igniter that had an annular circular orifice has been developed. The purpose of this study is to elucidate the relationship between the newly developed plasma Jet igniter configuration and combustion enhancement effects. In this newly developed plasma Jet igniter, flame front wrinkle appears on the flame front and flame propagates rapidly. Plasma Jet influences on the flame propagation far long period when the plasma jet igniter has issuing angle 90 degrees and large cavity volume, because the plasma jet only lasts several ms. However, in the early stage of combustion, flame front area of issuing angle 45 degrees is larger than that of 90 degrees, because the initial flame kernel is formed by the plasma jet.

Effect of the Configuration of Plasma Jet Plug on Combustion Characteristics in a Constant Volume Vessel (플라즈마 제트 플러그의 형상이 정적연소기내 연소특성에 미치는 영향)

  • Kim, Munheon;Yoo, Hoseon;Oh, Byungjin;Park, Jungseo
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.23 no.5
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    • pp.593-602
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    • 1999
  • This paper presents combustion characteristics of LPG-air mixture ignited by the plasma jet in a cylindrical vessel with constant volume, in which our focus is placed on the multi-hole plug configuration. Four types of the plug configuration depending on the number of orifice and the arranged angle are considered, along with two cases of conventional spark ignition for comparison. Not only the flame propagation is photographed at intervals, but the pressure in the combustion chamber is also recorded through the entire combustion process. The results show that the plasma jet ignition enhances the overall combustion rate remarkably in comparison to the spark ignition by generating irregular flame front and penetrating through the unburned mixture. The combustion enhancement rate agrees favorably with the available data, which supports the validity of our experiment. Synthetically estimating, the two-hole sixty-degree plug appears to be the most desirable, in that the maximum pressure as well as the combustion duration is less affected by the sub-energy level than the others. It is also deduced that there may exist an optimal plug configuration capable of rapid combustion for a specific combustion chamber.

Temperature Field and Emission Spectrum Measurement of High Energy Density Steam Plasma Jet for Aluminum Powder Ignition (알루미늄 분말 점화용 고밀도 스팀 플라즈마 제트 온도장 및 방출 스펙트럼 측정)

  • Lee, Sanghyup;Lim, Jihwan;Lee, Dohyung;Yoon, Woongsup
    • Journal of the Korean Society of Propulsion Engineers
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    • v.18 no.1
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    • pp.26-32
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    • 2014
  • In this study, DC (Direct current) type steam plasma igniter is developed for effective ignition of high-energy density metal aluminum and gas temperature is measured by emission spectrum of OH radical. Because of the ultra-high gas temperature, the DC plasma jet is measured by Boltzmann plot method which is the non-contact optical technique and spectrum comparison-analysis. And both methods were applied to experiment after accurate verification. As a result, we could identify that plasma jet temperature is 2900 K ~ 5800 K in the 30 mm range from the nozzle tip.

Development of a High Energy Ignition System Using Corona Discharge (코로나 방전을 이용한 고에너지 점화 시스템 개발)

  • Park, Kyongseok;Choi, Duwon;Kang, Hyehyun;Lee, Jonghwa;Park, Jinil
    • Transactions of the Korean Society of Automotive Engineers
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    • v.23 no.6
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    • pp.650-655
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    • 2015
  • A high energy ignition system is essential for lean burn or high EGR gasoline engine, which is getting more and more interest to improve fuel economy. The high energy ignition systems comprise plasma jet, laser beam, corona discharge and so on. In this study, a high energy ignition system using corona discharge is developed and tested in a constant volume combustion chamber. The developed system shows extension of lean limit of propane-air mixture and enhencement of combustion speed. Various shape of corona discharge plugs are also tested and compared in this study.

Forced Ignition Characteristics with a Plasma Jet Torch in Supersonic Flow (초음속 유동장 내 플라즈마 토치를 사용한 강제 점화 특성)

  • Kim, Chae-Hyoung;Jeung, In-Secuk;Choi, Byoung-Il;Kouchi, Toshinori;Masuya, Goro
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2011.04a
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    • pp.363-366
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    • 2011
  • Mixing and combustion experiments with a vent slot mixer were performed in Mach 2 supersonic wind tunnel. Helium and hydrogen gases each were used for the mixing and the combustion experiment with a plasma jet (PJ) torch. The vent slot mixer holds plenty of fuel in the downstream mixing region, even though the fuel is transversely injected. In case of the combustion, the injected fuel is ignited by the PJ torch, and then unburned mixture is burned by shock-induced combustion downstream. Thermal choking in the combustor leads to shock trains in the isolator, causing the unstable combustion.

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Combustion Characteristics Study using Hyper-mixer in Low-enthalpy Supersonic Flow (하이퍼 혼합기를 사용한 저엔탈피 초음속 유동장 내연소 특성 연구)

  • Kim, Chae-Hyoung;Jeung, In-Seuck
    • Journal of the Korean Society of Propulsion Engineers
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    • v.17 no.6
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    • pp.75-80
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    • 2013
  • In this study, a forced ignition method with a plasma jet torch is studied in Mach 2 laboratory scaled wind-tunnel. The hyper-mixer is used as a mixer. For two normal injection cases, the one is collided against a wedge plate of the hyper-mixer and the other is directly injected into the cold main flow. For the first case, the hyper-mixer disperses the injected fuel, leading to the mixing enhancement. Furthermore, the fuel-air mixture is provided into the plasma hot gas, which enhances the combustion performance. However, the direct injection into the main flow method spends amount of fuel without ignition in the cold supersonic flow. In the end, for the forced combustion, it is important to supply the fuel-air mixture into the heat source.