• 제목/요약/키워드: High Pressure Injection Nozzle

검색결과 140건 처리시간 0.019초

고압 분사노즐의 최적형상에 관한 연구 (A Study on the Optimum Shape of High-Pressure Injection Nozzle)

  • 이종선;김형철
    • 한국공작기계학회논문집
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    • 제12권2호
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    • pp.37-43
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    • 2003
  • This study makes to flow analysis of computational fluid dynamics(CFD) according to the basic theory of turbulent flow regarding high-pressure injection nozzle. It also makes structural analysis to find out the structural validity of the optimum shape of high-pressure injection nozzle. It divides to two areas such as plunger areas and high-pressure injection nozzle area including plunger.

고압 분사노즐의 구조해석 (Structural Analysis of High Pressure Injection Nozzle)

  • 원종진;이종선;윤희중;김형철
    • 한국공작기계학회:학술대회논문집
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    • 한국공작기계학회 2002년도 추계학술대회 논문집
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    • pp.69-74
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    • 2002
  • This study is object to structural analysis of high pressure injection nozzle. The finite element model was developed to compute the stress, strain for high pressure injection nozzle. For structural analysis using result from FEM code. This structural analysis results, many variables such as internal pressure, boundary condition, constraint condition and load condition are considered.

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증발 조건에서 초고압 분사와 노즐 홀 직경이 디젤 유량 및 분무 특성에 미치는 영향에 대한 연구 (Influence of Ultra-high Injection Pressure and Nozzle Hole Diameter on Diesel Flow and Spray Characteristics under Evaporating Condition)

  • 조원규;박영수;배충식;유준;김영호
    • 한국분무공학회지
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    • 제20권1호
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    • pp.43-52
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    • 2015
  • Experimental study was conducted to investigate the effects of ultra-high injection pressure and nozzle hole diameter on diesel flow and spray characteristics. Electronically controlled ultra-high pressure fuel injection system was made to supply the fuel of ultra-high pressure consistently. Three injection pressures, 80, 160, and 250MPa were applied. Four type of injectors with identical eight nozzle holes were used. The four injectors have nozzle hole diameters of 115, 105, 95, and $85{\mu}m$ respectively. Injection quantity and rate were measured to investigate flow characteristics according to injection pressures and nozzle hole diameters. Mie-scattering and shadowgraph were performed to visualize liquid and vapor phases of diesel spray in a constant volume combustion chamber (CVCC). Ambient conditions of high pressure and high temperature in a diesel engine were simulated by using CVCC.

디젤기관의 연소에 미치는 분사계의 영향 (Effects of the fuel injection system on combustion in a diesel engine)

  • 권순익;김완
    • 오토저널
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    • 제15권1호
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    • pp.37-44
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    • 1993
  • Fuel injection system is an important tool in the exhaust emission and performance of a diesel engine. Effects of the fuel injection system in diesel combustion was investigated experimentally by measuring the performance and analyzing the combustion phenomena in a D.I. diesel engine. The selected injection parameters were nozzle opening pressure, nozzle projection length, and nozzle spray angle. From the measured results, it is shown that the fuel injection pipe diameter is an effective means to improve engine performance in a middle and high speed range and the 2 stage spring nozzle holder has the advantage of increasing the engine performance due to the initial injection pressure in a low speed range. It has been also shown that increasing nozzle opening pressure resulted in decrease in smoke, but increase in NO$_{x}$ from the engine.e.

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직접분사식 가솔린엔진용 고압 스월분무의 액막두께 측정 및 해석 (Measurement and Analysis of Liquid Film Thickness of Pressure-Swirl Spray for Direct-Injection Gasoline-Engines)

  • 문석수;;오희창;배충식
    • 한국분무공학회지
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    • 제12권4호
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    • pp.211-219
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    • 2007
  • The liquid film thickness inside a pressure-swirl nozzle was measured, and then the measured liquid film thickness was compared with the results from previous empirical equations. The liquid film inside the nozzle was visualized using extended transparent nozzles and a microscopic imaging system, and then the measurement error was evaluated using optical geometry analysis. The high injection pressures up to 7MPa were adopted to simulate the injection conditions of the direct-injection spark-ignition engines. The totally different two injectors with different fuels, nozzle lengths, nozzle diameters and swirlers were utilized to obtain the comprehensive equations. The results showed that the liquid film thickness very slightly decreased at high injection pressures and the empirical equations overestimated the effect of injection pressure. Most of empirical equations did not include the effect of nozzle length and swirler angle, although it caused significant change in liquid film thickness. A new empirical equation was suggested based on the experimental results with the effects of fuel properties, injection pressure, nozzle diameter, nozzle length and swirler angle.

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고압 분사노즐의 구조해석 (Structural Analysis of High-Pressure Injection Nozzle)

  • 이종선;김형철
    • 한국산학기술학회:학술대회논문집
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    • 한국산학기술학회 2002년도 춘계학술발표논문집
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    • pp.155-159
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    • 2002
  • 본 논문에서는 균질기에서 사용되고 있는 고안 균질기용 분사노즐에 대하여 구조적 안정성을 평가할 수 있는 구조해석을 수행하였다. 구조해석을 수행하기 위하여 상용 유한요소해석 코드인 ANSYS를 활용하였으며 내압조건, 경계조건, 구속조건 등을 고려하여 고압 분사노즐내의 응력과 변형률을 구하였다.

전자유압식 분사계에 의한 초고압 디젤분무의 입경분포에 관한 연구 (A Study on the Droplet Size Distribution of Ultra High Pressure Diesel Spray on Electronic Hydraulic Fuel Injection System)

  • 장세호;안수길
    • 동력기계공학회지
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    • 제2권1호
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    • pp.25-30
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    • 1998
  • In order to investigate the droplet size distribution and Sauter Mean Diameter in a ultra high pressure diesel spray, fuel was injected with ultra high pressure into the environments of high pressure and room temperature by an Electronic Hydraulic Fuel Injection System. Droplet size was measured with the immersion liquid sampling technique. The immersion liquid was used a mixture of water-methycellulose solution and ethanol. The Sauter Mean Diameter decreased with increasing injection pressure, with a decrease environmental pressure (back pressure) and nozzle diameter. Increasing the injection pressure makes the fuel density distribution of the spray more homogeneous. An empirical correlation was developed among injection pressure, air density, nozzle diameter and the Sauter Mean Diameter of spray droplets.

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공기보조식 와류 노즐의 저압 분무특성 (Spray Characteristics of Air-assisted Vortex Nozzle at Low Pressure Condition)

  • 김우진;비멀;최장수
    • 한국분무공학회지
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    • 제20권2호
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    • pp.82-87
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    • 2015
  • A nozzle with vortex generator was used to develop the low pressure nozzle with high atomization performance and the nozzle atomized the liquid by centrifugal shear forces. In order to analyze the atomization characteristics, a shadowgraphy method was used and the measurement of droplet size was performed by using laser diffraction analyzer. The liquid injection pressure was fixed as 0.03 bar which is very low pressure and the gas injection pressures were changed from 0 bar to 2.0 bar. As a result, the breakup was achieved at the air injection pressure of 0.25 bar and over. The nozzle with the orifice diameter of 0.4 mm and the orifice gap of 0.25 mm presented small droplet diameters under 50 at the air injection pressure of 0.75 bar.

디젤엔진 연료계통의 유동 및 압력 변동특성에 관한 이론적 연구 (A Theoretical Study on Flow and Pressure Variation Characteristics of Fuel Supply System in Diesel Engine)

  • 송치성
    • Journal of Advanced Marine Engineering and Technology
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    • 제17권3호
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    • pp.12-23
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    • 1993
  • Combustion phenomenon in diesel engine is mainly governed by characteristics of fuel injection and fuel spray system affected by its dimensions and operating condition. Fuel supply system is consisted of fuel injection pump, high pressure pipe and injection nozzle. In order to develope the more economical diesel fuel injection system, it is in need to carryout the fairly wide range experiments, which is quite impossible. Therefore, theoretical analysis for the numberous parameters is powerful method in this case. In the present study, equations of continuity of fuel oil in fuel injection system are solved to obtain the flow and pressure variation in diesel fuel system affected by injection pump speed, plunger diameter, pipe length and nozzle opening pressure.

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절삭가공용 고압분사 홀더 개발에 관한 연구 (A Study on the Development of High Pressure Holder for Machining)

  • 이중섭;정인국;서정세;정상완
    • 한국기계가공학회지
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    • 제11권6호
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    • pp.55-61
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    • 2012
  • In this study, it was grasped to the flow characteristics of injection nozzle installed in high pressure holder for improving productivity. Chip curling occurred during cutting process for difficult-to-cut material detracts product qualities and productivity. Among of method preventing the phenomenon, high pressure injecting cutting oil is an alterative. In this study, the optimal nozzle was designed by CFD method and it was conducted to analyse on the effect of high pressure injection on chip shape generated during cutting process and wear of insert by experimental method. As the result, it could be confirmed that high pressure injection is favorable for preventing chip curling and insert from wearing.