Correlations for Turbulent Flame Speed of Different Syngas Mixtures at High Pressure and Temperature
Correlations for Turbulent Flame Speed of Different Syngas Mixtures at High Pressure and Temperature
复制标题
高压高温下不同合成气混合物湍流火焰速度的相关性
DOI：
10.1115/gt2012-69611
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
P. Jansohn
中科院分区：
文献类型：
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作者：
S. Daniele;P. Jansohn
对于高温高压下湍流火焰的行为，尤其是含氢燃料的行为，显然缺乏数据和理解。在众多有关参数中，湍流火焰速度ST是科学家和工程师最感兴趣的参数之一，本文报道了在类似燃气轮机条件下预混合成气燃烧的实验研究，重点是确定ST/SL，即单位时间总燃料消耗量。在压力高达2.00MPa、入口温度高达773 K、入口速度高达150 m/s、u′/SL大于100的条件下进行了实验。不同的合成气混合物和甲烷之间的比较清楚地表明前者燃料的ST/SL高得多。结果表明，即使在很高的u′/SL下，ST/SL也强烈依赖于与流体动力学效应共同作用的优先扩散热效应（PDT）。ST/SL随着燃料混合物中氢含量的增加和压力的增加而增加。ST/SL的相关性有效的所有调查的燃料混合物，包括甲烷，提出在湍流特性（湍流强度和积分长度尺度），燃烧特性（层流火焰速度和层流火焰厚度）和操作条件（压力和入口温度）。相关性捕获优先扩散热和流体动力学不稳定性的影响。版权所有© 2012 ASME
There is an obvious lack of data and understanding of the behavior of turbulent flames at high temperature and high pressure, especially concerning hydrogen containing fuels. Among the many relevant parameters, the turbulent flame speed “ST” is one of the most interesting for scientists and engineers.This paper reports an experimental investigation of premixed syngas combustion at gas-turbine like conditions, with emphasis on the determination of ST/SL derived as global fuel consumption per unit time. Experiments at pressures up to 2.00 MPa, inlet temperatures and velocities up to 773K and 150 m/s respectively, u′/SL greater than 100 are presented. Comparison between different syngas mixtures and methane clearly show much higher ST/SL for the former fuel. It is shown that ST/SL is strongly dependent on preferential diffusive-thermal (PDT) effects, co-acting with hydrodynamic effects, even for very high u′/SL. ST/SL increases with rising hydrogen content in the fuel mixture and with pressure. A correlation for ST/SL valid for all investigated fuel mixtures, including methane, is proposed in terms of turbulence properties (turbulence intensity and integral length scale), combustion properties (laminar flame speed and laminar flame thickness) and operating conditions (pressure and inlet temperature). The correlation captures effects of preferential diffusive-thermal and hydrodynamic instabilities.Copyright © 2012 by ASME