Burning velocity correlation of methane/air turbulent premixed flames at high pressure and high temperature
Burning velocity correlation of methane/air turbulent premixed flames at high pressure and high temperature
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DOI：
10.1016/j.proci.2004.08.098
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发表时间：
2005-01-01
影响因子：
3.4
通讯作者：
Ogami, Y
中科院分区：
文献类型：
--
作者：
Kobayashi, H;Seyama, K;Ogami, Y
测量了甲烷/空气混合物在从大气压到1.0 MPa的压力范围和300和573 K的混合物温度下的湍流燃烧速度，这涵盖了预混型燃气轮机燃烧室的典型操作条件。使用在高压室中稳定的本生型火焰，并且在压力和混合物温度保持恒定的情况下进行OH-PLIF可视化。除了用于高压实验的出口直径为20 mm的燃烧器之外，还在大气压力下使用出口直径为60 mm的大型燃烧器，以基于泰勒微尺度R-gimel的湍流雷诺数作为比较压力和温度效应的常用参数。证实了即使在大气压下，R-gimel也可以达到100以上，并且u ′/SL可以延长。基于使用OH-PLIF图像确定的平均进展变量（c）= 0.1的轮廓，测量湍流燃烧速度。在573 K下，压力对预热混合物的S-T/S-L也有很大影响。S-T/S-L曲线随U '/S-L的弯曲趋势与压力和混合物温度无关，发生弯曲的R-gimel区域与火焰扰动的最小尺度（作为分形内截止测量）接近特征火焰不稳定尺度并变得几乎恒定的区域很好地对应。当用（c）= 0.1的等值线确定S-T时，可以清楚地看到S-T/S-L与（P/P-0）（u ′/S-L）的幂律关系，指数接近0.4，表明与以前用平均火焰锥法的结果一致，以及压力对湍流燃烧速度的显著影响。(c)2004年，在燃烧研究所。爱思唯尔公司出版All rights reserved.
Turbulent burning velocities for methane/air mixtures at pressures ranging from atmospheric pressure up to 1.0 MPa and mixture temperatures of 300 and 573 K were measured, which covers the typical operating conditions of premixed-type gas-turbine combustors. A bunsen-type flame stabilized in a high-pressure chamber was used, and OH-PLIF visualization was performed with the pressure and mixture temperature being kept constant. In addition to a burner with an outlet diameter of 20 mm for the high-pressure experiments, a large-scale burner with an outlet diameter of 60 mm was used at atmospheric pressure to extend the turbulence Reynolds number based on the Taylor microscale, R-gimel, as a common parameter to compare the pressure and temperature effects. It was confirmed that R-gimel over 100 could be attained and that u'/SL could be extended even at atmospheric pressure. Based on the contours of the mean progress variable (c) = 0.1 determined using OH-PLIF images, turbulent burning velocity was measured. S-T/S-L was also found to be greatly affected by pressure for preheated mixtures at 573 K. The bending tendency of the S-T/S-L curves with U'/S-L was seen regardless of pressure and mixture temperature and the R-gimel region where the bending occurs corresponded well to the region where the smallest scale of flame wrinkling measured as a fractal inner-cutoff approaches the characteristic flame instability scale and becomes almost constant. A power law Of S-T/S-L with (P/P-0)(u'/S-L) was clearly seen when S-T was determined using (c) = 0.1 contours, and the exponent was close to 0.4, indicating agreement with the previous results using the mean flame cone method and the significant pressure effects on turbulent burning velocity. (c) 2004 The Combustion Institute. Published by Elsevier Inc. All rights reserved.