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Two-point OH time-series statistics for turbulent partially premixed jet flames

机译:湍流部分预混射流火焰的两点OH时间序列统计

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Two-point time-series measurements of OH are reported in a series of turbulent partially premixed H_2/ CH_4 -air flames by employing two-point picosecond time-resolved laser-induced fluorescence (PITLIF). Spatial and temporal autocorrelation functions, and corresponding integral length and time scales, are computed from the time series, permitting a detailed investigation of [OH] structures within the partially premixed flames. By varying Reynolds numbers and fuel-stream equivalence ratios, we examine the effects of these parameters on the integral length and time scales. Interpretation of these results draws upon knowledge of turbulent nonpremixed jet flames and partially premixed combustion, which highlights turbulence-chemistry interactions.
机译:通过使用两点皮秒时间分辨的激光诱导荧光(PITLIF),在一系列湍流的部分预混H_2 / CH_4-空气火焰中报告了OH的两点时间序列测量。从时间序列中计算出空间和时间自相关函数,以及相应的积分长度和时间尺度,从而可以详细研究部分预混火焰中的[OH]结构。通过改变雷诺数和燃料流当量比,我们检查了这些参数对积分长度和时间尺度的影响。这些结果的解释基于对湍流非预混喷射火焰和部分预混燃烧的了解,这突出了湍流-化学相互作用。

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