• Title/Summary/Keyword: 로그-쌍곡선 확률밀도함수

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Measurements of Droplet Sizes and Velocities with Optimum Probability Density Function in a Transient Liquefied Butane Spray (액상부탄 간헐분무의 액적 크기 및 속도 측정과 최적 확률분포 연구)

  • Kim, J.H.;Kim, J.W.;Koo, J.Y.
    • Journal of ILASS-Korea
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    • v.5 no.1
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    • pp.30-40
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    • 2000

  • The characteristics of liquefied butane spray are expected to be different from conventional diesel fuel spray, because a kind of flash boiling spray is expected when the back pressure is below the saturated vapor pressure of the butane(0.23MPa at 298K). The ambient pressure was held at a pressure above(0.37MPa) and below(0.15MPa) the fuel vapor pressure. The axial velocities, radial velocities, and size distributions in butane sprays were measured with PDPA(Phase Doppler Particle Analyzer) system. The PDPA measurement showed a smaller SMD at the 0.15MPa chamber pressure, compared to the 0.37MPa case. Log-hyperbolic density function for the droplets size distribution can be fitted to the experimental results of a liquefied butane spray.

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