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학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
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논문 기본 정보
- 자료유형
- 학술대회자료
- 저자정보
- 발행연도
- 2003.5
- 수록면
- 398 - 403 (6page)
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Entrainment of ambient gas is a crucial characteristics of transient diesel spray. Recently, it was found that the mass flow rate of ambient gas into transient diesel spray increased with the distance from the nozzle, i.e., axial momentum flow rate of entrained gas increased along spray axis. This tendency is different from the turbulent jet whose momentum flow rate is independent from axial positions.
To understand more detailed spray behaviors, it is necessary to quantify the entrainment characteristics of transient diesel sprays under realistic injection and ambient conditions In this study, measured was the entrained velocity of ambient gas into a diesel spray with LDV (Laser Doppler Velocimetry) technlmique. Non-evaporating transient diesel sprays from a common-rail injection system with triangular injection rate profile were observed. The effects of ambient gas density and nozzle hole geometry were assessed with entrainment coefficient.
There appeared a region where entrainment coefficients were remaining almost constant after onset of entrainment while iIjection rates were changing The effect of common-rail pressure, which altered the slope of injection rate curve, was hardly noticed at this region. Entrainment coefficient increased with ambient gas density, that is, the effect of ambient gas density on entrainment of transient diesel spray is larger than that of turbulent jet whose entrainment coefficient remains constant.
Non-dimensional distance was defined to reflect the effect of nozzle hole diameter and ambient gas density together. Mean value of entrnainment coefficient was found to increase with non-dimensional distance from the nozzle.
To understand more detailed spray behaviors, it is necessary to quantify the entrainment characteristics of transient diesel sprays under realistic injection and ambient conditions In this study, measured was the entrained velocity of ambient gas into a diesel spray with LDV (Laser Doppler Velocimetry) technlmique. Non-evaporating transient diesel sprays from a common-rail injection system with triangular injection rate profile were observed. The effects of ambient gas density and nozzle hole geometry were assessed with entrainment coefficient.
There appeared a region where entrainment coefficients were remaining almost constant after onset of entrainment while iIjection rates were changing The effect of common-rail pressure, which altered the slope of injection rate curve, was hardly noticed at this region. Entrainment coefficient increased with ambient gas density, that is, the effect of ambient gas density on entrainment of transient diesel spray is larger than that of turbulent jet whose entrainment coefficient remains constant.
Non-dimensional distance was defined to reflect the effect of nozzle hole diameter and ambient gas density together. Mean value of entrnainment coefficient was found to increase with non-dimensional distance from the nozzle.
목차
ABSTRACT
1.서론
2.실험장치 구성 및 조건
3.결과 및 토의
4.결론
후기
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