• 제목/요약/키워드: Pintle injector

검색결과 43건 처리시간 0.018초

레이저 회절법을 이용한 축대칭 분무 구조의 공간 분포 변환에 관한 실험적 연구 (An Experimental Study of Reconstruction from Laser Diffraction Measurement for Axisymmetric Sprays)

  • 양승연;이충훈;구자예;정석호
    • 한국자동차공학회논문집
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    • 제8권1호
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    • pp.10-16
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    • 2000
  • Spatially resolved liquid volume fractions from a set of line-of-sight laser diffraction measurements for axisymmetric sprays generated from a pintle-type gasoline injector have been tomographically reconstructed by Abel transformation, Fourier transformation and onion peeling method. Spatially resolved liquid volume fractions classified into 32 size groups were translated characteristics of SI engine fuel sprays. These data were also obtained from the phase Doppler measurements for the same sprays. The comparison between laser deffraction measurements and transformation reconstructs more reasonable spatially resolved characteristics for axisymmetric sprays as well as for asymmetric sprays.

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디지털 이미지 법을 이용한 가솔린 분무의 유동 특성에 관한 연구 (A Study on the Flow Characteristics of Gasoline Spray using Digital Image Processing)

  • 이창식;이기형;전문수;김영호
    • 한국자동차공학회논문집
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    • 제6권4호
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    • pp.219-227
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    • 1998
  • This paper describes the fuel spray characteristics of gasoline port injectors such as the breakup procedures of liquid fuel, breakup and extinction behaviors of fuel spray at nozzle tip, time history of SMD and velocity distribution of fuel spray in the direction of fuel stream. Pintle-type gasoline fuel injector was used to analyze mentioned spray characteristics. In order to visualize the fuel spray behaviors and to measure the droplet mean diameter and velocities of spray droplets, the Schlieren method, digital image processing and auto-correlation PIV were applied in this study. In addition, the spray characteristics according to the variation of time were considered. The results of fuel spray show that the liquid sheet breakup starts at 10mm downstream actively. The flying time is approximately 4msec between 50mm and 80mm down the nozzle tip. Also, SMD of fuel spray, the number of droplets and fuel velocity distribution at each point of downstream are discussed.

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LPG 연료의 직접 분사를 위한 핀틀타입 인젝터의 비정상 분무 특성에 관한 수치해석 (A Computation study on Characteristics of Transient Injection of Pintle-type Injector for Direct Injection of LPG)

  • 최성훈;황상순
    • 한국분무공학회지
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    • 제4권3호
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    • pp.15-23
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    • 1999
  • The use of LPG as clean fuel for Diesel engine is very attractive way to reduce soot and NOx emission. In this study, a numerical study has been done to know the transient behavior of LPG fuel in chamber pressures which is held at a pressure above (0.37MPa)and below(0.15MPa)the fuel vapor pressure. Results show that the vortex formed within the start of injection at the leading edge of the spray cone and was most apparent for 0.15MPa chamber pressure case. The high speed photographs and model results showed a narrower cone angle during the quasi-steady spray period at the 0.37MPa chamber pressure compared to the 0.15MPa case. And it can be shown that more realistic vaporization process is necessary to predict the spray length well.

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