• Title/Summary/Keyword: 화상해석장치

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A Study on Diesel Spray and Flame by Rapid Compression Machine (급속압축장치에 의한 디이젤 분무 , 화염의 연구)

  • 안수길
    • Journal of the Korean Society of Fisheries and Ocean Technology
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    • v.19 no.1
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    • pp.40-45
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    • 1983
  • The paper describes an experimental investigation of axisymmetric diesel spray and flame which is held in rapid compression machine (RCM) with electromagnetic single injection nozzle. The axisymmetric diesel spray and flame are taken with high speed photograph and analysis it with image processor. The data presented include fuel concentration of spray, flame temperature, soot concentration of flame in axial and radial direction at a moment and compared it with each other.

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An Estimation of the Temperature Distribution and the Soot Density in Diesel Flame with the Two-Color Method using Image Analysis System (화상 2색법에 의한 디젤화염의 온도분포 및 매연농도의 평가)

  • 방중철;최익수
    • Transactions of the Korean Society of Automotive Engineers
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    • v.11 no.5
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    • pp.60-69
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    • 2003
  • The simplified two-color method is proposed which can estimate the temperature distribution and the soot density of the whole flame with the image analysis of the high-speed photographs. The factors influenced on its processing were examined, for example, the selection of the wave length, the kind of films, the preparation of the calibration curve between the radiance of flame and the luminance temperature. The simplified two-color method reported in this paper can be used as a tool for the improvement of the combustion process in direct injection diesel engine.

Characteristics on the Motion of Purse Seine(II) -An Analysis on the Sinking Characteristics of Model Purse Seine by Different Netting Material- (건착망의 운동특성(II) -그물감이 다른 건착망의 침강특성 해석-)

  • Kim, Suk-Jong;Park, Jeong-Sik
    • Journal of the Korean Society of Fisheries and Ocean Technology
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    • v.31 no.4
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    • pp.372-378
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    • 1995
  • This study describes an analysis on the sinking characteristics in purse seine. The experiment was carried out using three simplified model seines in a flume tank under still water condition. The densities($\rho$) of netting materials were 0.91g/$cm^3$ for PP seine, 1.14g/$cm^3$ for PA seine and 1.38g/$cm^3$ for PES seine. Differential equations were derived from the conservation of momenta of the model seines and used to determine the sinking speeds of the depths of leadline and the other portions of seines. An analysis carried out by simultaneous differential equations for numerical method by subroutine Runge-Kutta-Gill. The results obtained were as follows: 1) Sinking speed of net margin was fastest for PP seine, followed by PA and PES seines. 2) The coefficient of resistance for netting of seine was estimated to be $K_D=0.061({\frac{\rho}{{\rho}_w}})^4$. 3) The coefficient of resistance for netting bundle of seine was estimated to be $C_R=0.91({\frac{\rho}{{\rho}_w}}$. 4) In all seines, the calculated depths of leadline closely agreed with the measured ones(meas.=0.99cal.).

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A Study on the Strain Analysis of Cracked Plate by Electronic Speckle Pattern Interferometry (전자처리 Speckle Pattern 간섭법에 의한 균열평판의 Strain 해석에 관한 연구)

  • 김경석;양승필
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.19 no.6
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    • pp.1382-1390
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    • 1995
  • Electronic Speckle Pattern Interferometry (ESPI) with a CW laser, a video system and an image processor was utilized to measure the in-plane displacement. Unlike traditional strain gauges or Moire method. ESPI method measure the in-plane displacement on real time with out any surface preparation on surface attachment. The specimen has a crack of 10*0.1 mm in the middle of plate and strain gauge was also attached on that surface to compare with ESPI method. This study reveled the ESPI method to measure the displacement and distribution of strain in the specimen. It was shown in tensile tests that the measurement by ESPI method was comparable with strain gauge.

Jitter Due to Stuffing Synchronization for Synchronous Network (동기식통신망을 위한 스타핑동기방식에서 발생되는 지터에 관한 연구)

  • 최승국
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.17 no.5
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    • pp.433-441
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    • 1992
  • The new synchronous hierarchy with abase signal near 150Mbit/s will become the international standards. An asynchronous video signal will be transmitted in the synchronous network with stuffing synchronization technique. In this study an estimate of power spectrum and effective values of the stuffing jitter signals under the influence of system parameters were obtained. The results show that the real stuffing jitter is greater than the ideal stuffing jitter.

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A Study on the Fuel Spray and Atomization Characteristics of MPI Gasoline Injector (MPI 가솔린 기관용 인젝터의 분무 거동 및 미립화 특성에 관한 연구)

  • Seo, Y.H.;Lee, C.S.;Lee, K.H.
    • Journal of ILASS-Korea
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    • v.1 no.4
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    • pp.32-39
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    • 1996
  • Fuel spray in the MPI gasoline injector and its atomization characteristics are investigated with both macroscopic and microscopic visualization systems. The Bosch injector is inserted into an air-assist spray adapter which is designed to be fabricated and assembled easily. particle motion analysis system is used to measure the SMD of injector, where the assistant air pressure is varied from 0.0 to 1.5bar with fuel pressure 2.8bar. Droplet size decreased with higher air pressure and fine fuel spray with below $60{\mu}m$ of SMD is acquired at the assistant air pressure over 0.5bar.

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The Effect of the Air Temperature and Air-assisted Pressure on the Fuel Droplet Atomization (분무 공간의 공기온도와 보조공기의 공급압력이 연료입자의 미립화에 미치는 영향)

  • Kim, Y.S.;Lee, J.S.;Yoon, S.H.;Chung, S.S.;Ha, J.Y.
    • Journal of ILASS-Korea
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    • v.3 no.4
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    • pp.16-24
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    • 1998
  • The fuel injection type, in the gasoline engines of atomization of fuel droplet and its distribution hae influenced directly on the decision of engine performance and harmful emission. In this paper, atomization characteristics of fuel spray is investigated with microscopic visualization system. Particle motion analysis system is used to measure the SMD from fuel spray of air-assisted injector by initial factors such as temperature of ambient air and air-assisted pressure. As air-assist pressure and ambientair temperature increase, the SMD is decreased, and its variation is more stable.

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A Study on the Diesel Flame by Means of Image Analysis ofn Shadow Photographs (음영사진의 화상해석에 의한 디젤화염에 관한 연구)

  • 장영준;박호준;신본무정
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.14 no.5
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    • pp.1222-1233
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    • 1990
  • The formation and oxidation processes of soot particles in a diesel flame were investigated with a rapid compression machine. A cloud of soot particles was successfully visualized by means of the instantaneous laser shadow photographs technique and the equivalence ratio of the soot formation zone was estimated from a measured fuel concentration distribution in a nonevaporating spray. The temporal and spatial variation of soot concentration in the flame was also correlated with the rate of heat release. Soot particles appears first in a region near the flame tip when diffusion combustion period starts, and its concentration is a maximum at about the end of injection, then decreases due to oxidation. The reason for soot being formed in a fuel lean region near the flame tip is the evaporated fuel requires time to be pyrolized as it travels through the burning fuel rich zone towards the flame tip.

A Study of Spray Characteristics of Injector on the Air-assisted Pressure Variation (보조 공기 압력 변화에 따른 인젝터의 분무 특성에 관한 연구)

  • Yoon, S.H.
    • Journal of ILASS-Korea
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    • v.3 no.4
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    • pp.58-64
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    • 1998
  • In the gasoline engine of fuel injection type, atomization of fuel droplet and its distribution has directly influenced the performance of engine and harmful emission. To investigate atomization characteristics of fuel spray, in this paper fuel spray of air-assisted injector is observed at the various initial conditions of ambient air temperature and air assisted pressure. Behavior of fuel spray is photographed with microscopic visualization system. The SMD of fuel droplet is measured with PMAS (Particle Motion Analysis System). The effect of air-assisted pressure and temperature of ambient air resulted in the decrement of SMD and its variation. Finally, It was found that It was found that from spray angle at the two-hole injector had measured $20{\pm}4$ degree the result of photographs by shadow graphy. The mean diameter of suns decreased and the of droplets increased with increasing the temperature in the spray fields by the results of PMAS measurement. It was found that the characteristics of sprays became finer by increasing the temperature of spray fields about 373K without the delivery of air-assistance.

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An Experimental Study on the Spray Characteristics by Twin-Fluid Atomizer for Wide Band Spray (광폭면 분무를 위한 2유체 노즐의 분무 특성에 관한 연구)

  • Lee, Joong-Soon
    • Journal of ILASS-Korea
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    • v.13 no.4
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    • pp.212-219
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    • 2008
  • To develop the twin-fluid atomizer having the excellent performance of painting, the spray characteristics of how a wide area can be painted efficiently by one time spraying were studied in this paper. Spray phenomena are affected by the many factors determining the spray field such as the spraying pressure of gas, the spraying pressure and viscosity of liquid paints, the opening duration of needle valve, the design dimension of nozzle, and so on. As the results of experiments, these factors affecting on spray characteristics were suggested as followings; 1) The optimum spraying pressure of gas was $0.015{\sim}0.02\;kPa$, and the appropriate spraying pressure of liquid paint was 0.01kPa, In these situations, the setting up pressures must be compensated as much as the losing amount of pressure because a decompression occurred when operating valves. 2) The duration of opening the needle valve must be sustained for $1{\sim}2$ seconds to inject gas after spraying the liquid paint. This operating of the needle valve was necessary to avoid the affect on the changing of liquid column length, and to prevent the droplet deposit at the initial time of spraying. 3) The spray tip penetration was gained form the experimental equation, and the effective spraying angle was $85^{\circ}{\pm}5^{\circ}$ just at he appropriate spraying pressure of gas. The distribution of the area sprayed had the variation in $350{\pm}50\;mm$ because of the spraying pressure of gas, the its distance from the spray tip, and the lift of the needle valve.

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