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학술저널
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대한기계학회 대한기계학회 논문집 B권 대한기계학회논문집 B권 제28권 제10호
발행연도
2004.10
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1,193 - 1,201 (9page)

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The effect of equivalence ratio and fuel/air mixing quality on the phase-resolved gas temperatures at different phases of the oscillating pressure cycle was experimentally investigated An atmospheric pressure, optically accessible and laboratory-scale dump combustor operating on methane With heat release rate of 1 59㎾ was used Temperature measurements were made using coherent anti-Stokes Raman spectroscopy (CARS) at several spatial locations for typical unstable combustion conditions Analysis was conducted using parameters such as phase-resolved averaged temperature, normalized standard deviation and temperature probability distribution functions (PDFs). Also the probability on the occurrence of high temperature (over 1900K) was investigated to get the information on the perturbation of equivalence ratio and NOx emission characteristics It was shown that most of temperature histograms exhibit Gaussian profile which has short breadth of temperature fluctuation at equivalence ratio of 0 6, while beta profile was predominant for the cases of other equivalence ratios (φ=0.55, 0 50) It was also shown that phase-resolved averaged temperature oscillated In phase with pressure cycle, while normalized standard deviations which represent temporal turbulent intensity of temperature showed nearly constant value around 0 1 The characteristics on the occurrence of high temperature also displayed periodic wave form which was very smilar to the pressure signal And the amplitude of this profile went larger as the fuel/air mixing quality became poorer These also provided additional information on the perturbation of equivalence ratio at flame as well as NOx emission characteristics.

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UCI(KEPA) : I410-ECN-0101-2009-550-014426520