• Title/Summary/Keyword: 가시화염형상

Search Result 8, Processing Time 0.021 seconds

Characteristics of Non-premixed Synthetic Natural Gas-Air Flame with Variation in Fuel Compositions (합성천연가스의 조성변화에 따른 확산화염 연소특성)

  • Oh, Jeongseog;Dong, Sangeun;Yang, Jebok
    • Transactions of the Korean Society of Mechanical Engineers B
    • /
    • v.37 no.9
    • /
    • pp.829-836
    • /
    • 2013
  • The combustion characteristics with variations in synthetic natural gas (SNG) compositions were studied in a lab-scale combustor. The objective of the current study is to investigate the flame stabilization, flame structure, and spectrometry in a non-premixed SNG flame with varying fuel compositions. For the analysis of light emission in SNG flames, we used a spectrometer. As experimental conditions, the fuel jet velocity at the nozzle exit $u_F$ was varied from 5 to 40 m/s and the coaxial air velocity $u_A$ was varies from 0 to 0.43 m/s. The experiments showed that the flame stability increased with the hydrogen component in SNG.

Combustion Characteristics of Methane-Oxygen Diffusion Flame Formed by Swirl-coaxial Injector (스월 동축형 인젝터에 의해 형성되는 메탄-산소 확산화염의 연소특성)

  • Bae, Seong Hun;Hong, Joon Yeol;Kim, Heuy Dong;Kim, Jeong Soo
    • Journal of the Korean Society of Propulsion Engineers
    • /
    • v.21 no.2
    • /
    • pp.1-8
    • /
    • 2017
  • In order to analyze combustion characteristics of methane-oxygen diffusion flame in a model combustor, combustion experiments were carried out under various spray conditions of propellant scrutinizing combustion stability limit and flame shapes. As the propellant approached the theoretical equivalence ratio condition, a stable detached flame was observed even under high oxygen Reynolds number. And the length of the visible flame increased and the lift-off distance of the flame exhibited a tendency toward decrease. Due to the swirl effect of the propellant by the swirl-coaxial injector, a wide and short flame was produced. Thus, it may be appropriate to employ the swirl-coaxial injector in thrusters having a limited physical dimension.

Visualization of the Combustion-field in Ultrasonically-atomized Slit-jet Flame Using a Thermo-graphic Camera (열화상카메라를 이용한 초음파 무화 슬릿제트화염의 연소장 가시화)

  • Kim, Min Sung;Koo, Jaye;Kim, Heuy Dong;Kim, Jeong Soo
    • Journal of the Korean Society of Propulsion Engineers
    • /
    • v.20 no.4
    • /
    • pp.1-8
    • /
    • 2016
  • An experimental study was performed for the combustion-field visualization of the burner which burns the liquid hydrocarbon fuel atomized by an ultrasonic oscillator. Configurations of the flame and combustion-field were caught by both high-speed camera and thermo-graphic camera, and those images were analyzed in detail through a post-processing. As a result, the combustion-field grew and reaction-temperature rose due to the strengthening of combustion reaction with the increasing flow-rate of carrier-gas. In addition, a phenomenon of flame flickering was discussed through the comparative analysis of the variational behaviors between the visible flame and IR (Infrared) flame-field.

Periscope Imaging System Design and Analysis for Flame Front Visualization (화염 정면 가시화를 위한 페리스코프 영상 시스템 설계 및 해석)

  • Shin, Jaeik
    • Journal of Aerospace System Engineering
    • /
    • v.13 no.5
    • /
    • pp.16-23
    • /
    • 2019
  • This paper describes the design and analysis of a periscope imaging system installed at the engine test facility in the Agency for Defense Development. The periscope system is a cylinder-shaped image observation system installed at the rear of the engine and at the top of the diffuser. The periscope system has high risk of breaking because it is directly affected by high temperature (2300 K) and products of combustion. Thus, we used 1D heat transfer calculation, and 2D and 3D CFD analysis to confirm the heat flux and temperature distribution. Also, the cooling performance was verified. In the current design, using the periscope system, we can see flame shapes, control of the nozzle, and stability of the exhaust flow visually.

Fundamental Experiments of a Compression Ignition Engine Using Gaseous Fuel (가스체 연료를 사용하는 압축착화기관에 관한 기초적 연구)

  • ;太田 幹郞
    • Transactions of the Korean Society of Automotive Engineers
    • /
    • v.4 no.2
    • /
    • pp.147-157
    • /
    • 1996
  • Natural gas is gaining more attraction as a future fuel in particular both for environmental protection and energy conservation. In order to bring about more widespread use of gaseous engines, the technology capable of achieving output and efficiency performance equivalent to that of diesel engines needs to be developed. In the present paper, the requirements of the pilot torch from pre-chamber for ensuring ignition and promoting combustion are discussed by means of taking high-speed flame photography and system can run with leaner mixture of various fuels comparing to the electric plug ignition system cause the ignition delay period ignited with the torch and the combustion period are very short in spite of changing A/F of gaseous fuels in the main chamber. However, the suitable piston-cavity design for the use of lower-hydrocarbon fuels such as propane and butane must be discussed increasingly in the mear future.

The Effect of Air and Spray Turbulence on the Progress in a D.I. Diesel Engine(II)-Combustion Chamber Design for the Use of Emulsified Diesel Oil with Water Particles- (직접분사식 디젤기관의 연소실 형상과 화염의 발달 (2)-유화액연료용 연소실의 형상-)

  • ;;Ohta, Motoo
    • Transactions of the Korean Society of Mechanical Engineers
    • /
    • v.19 no.11
    • /
    • pp.3054-3062
    • /
    • 1995
  • Recently, the improvement of fuel economy and the reduction of exhaust smoke and NOx have been successfully achieved by supplying diesel engines with emulsified diesel oil with water particles. In the present paper, the difference between the combustion of injected emulsified fuel and that of diesel oil spray is clarified by means of taking high-speed and color photographs of the flames in the engine cylinder. As the results, the two kinds of fuels show different combustion behavior each other in the growth of initial flame and in the termination of combustion process in the cylinder. Then, suitable combustion chamber design for the use of emulsified fuel is discussed on the basis of experimental data for various distribution of spray in different kinds of piston cavities. Some methods of clearing troubles caused by emulsified fuel injection are also discussed on the basis of performance tests with a remodeling test engine.

Effect of Volatile Matter and Oxygen Concentration on Tar and Soot Yield Depending on Coal Type in a Laminar Flow Reactor (LFR에서 탄종에 따른 휘발분과 산소농도가 타르와 수트의 발생률에 미치는 영향)

  • Jeong, Tae Yong;Kim, Yong Gyun;Kim, Jin Ho;Lee, Byoung Hwa;Song, Ju Hun;Jeon, Chung Hwan
    • Korean Chemical Engineering Research
    • /
    • v.50 no.6
    • /
    • pp.1034-1042
    • /
    • 2012
  • This study was performed by using an LFR (laminar flow reactor), which can be used to carry out different types of research on coal. In this study, an LFR was used to analyze coal flames, tar and soot yields, and structures of chars for two coals depending on their volatile content. The results show that the volatile content and oxygen concentration have a significant effect on the length and width of the soot cloud and that the length and width of the cloud under combustion conditions are less than those under a pyrolysis atmosphere. At sampling heights until 50 mm, the tar and soot yields of Berau (sub-bituminous) coal, which contains a large amount of volatile matter, are less than those of Glencore A.P. (bituminous) coal because tar is oxidized by the intrinsic oxygen component of coal and by radicals such as OH-. On the other hand, at sampling heights above 50 mm, the tar and soot yields of Berau coal are higher than those of Glencore A.P. coal by reacted residual volatile matter, tar and light gas in char and flame. With above results, it is confirmed that the volatile matter content and the intrinsic oxygen component in a coal are significant parameters for length and width of the soot cloud and yields of the soot. In addition, the B.E.T. results and the images of samples (SEM) obtained from the particle separation system of the sampling probe support the above results pertaining to the yields; the results also confirm the pore development on the char surface caused by devolatilization.

Experimental Study on Particle Temperature and CO/CO2 Emission Characteristics of Pulverized Coal Combustion Condition According to Coal Types in Blast Furnace (고로 내 미분탄 연소조건에서 탄종에 따른 입자온도와 CO/CO2 배출 특성에 관한 연구)

  • Cho, Young Jae;Kim, Jin Ho;Kim, Ryang Gyun;Kim, Gyu Bo;Jeon, Chung Hwan
    • Transactions of the Korean Society of Mechanical Engineers B
    • /
    • v.38 no.10
    • /
    • pp.807-815
    • /
    • 2014
  • This study was performed using a laminar flow reactor that could replicate the combustion environment of pulverized coal in a blast furnace. Since a pulverized coal injection system was developed for iron making, the combustion characteristics of pulverized coal have been important in the iron and steel industry. The flame structure, particle temperature, and exhaust gas were investigated for different types of coal. The results of this study demonstrated that the combustion characteristics of coal are influenced by several properties of individual coals. In particular, the CO emission and volatile matter content of individual coals were found to have a strong influence on their combustion characteristics. Thus, this study found the properties of the coals to be significant and focused on the particle temperature and CO and $CO_2$ emissions.