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首页> 外文期刊>Combustion theory and modelling >Effects of pressure and fuel dilution on coflow laminar methane-air diffusion flames: Acomputational and experimental study
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Effects of pressure and fuel dilution on coflow laminar methane-air diffusion flames: Acomputational and experimental study

机译：压力和燃料稀释对CoFlow层层甲烷 - 空气扩散火焰的影响：亚马库特和实验研究

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摘要

In this study, the influence of pressure and fuel dilution on the structure and geometry of coflow laminar methane-air diffusion flames is examined. A series of methane-fuelled, nitrogen-diluted flames has been investigated both computationally and experimentally, with pressure ranging from 1.0 to 2.7atm and CH4 mole fraction ranging from 0.50 to 0.65. Computationally, the MC-Smooth vorticity-velocity formulation was employed to describe the reactive gaseous mixture, and soot evolution was modelled by sectional aerosol equations. The governing equations and boundary conditions were discretised on a two-dimensional computational domain by finite differences, and the resulting set of fully coupled, strongly nonlinear equations was solved simultaneously at all points using a damped, modified Newton's method. Experimentally, chemiluminescence measurements of CH* were taken to determine its relative concentration profile and the structure of the flame front. A thin-filament ratio pyrometry method using a colour digital camera was employed to determine the temperature profiles of the non-sooty, atmospheric pressure flames, while soot volume fraction was quantified, after evaluation of soot temperature, through an absolute light calibration using a thermocouple. For a broad spectrum of flames in atmospheric and elevated pressures, the computed and measured flame quantities were examined to characterise the influence of pressure and fuel dilution, and the major conclusions were as follows: (1) maximum temperature increases with increasing pressure or CH4 concentration; (2) lift-off height decreases significantly with increasing pressure, modified flame length is roughly independent of pressure, and flame radius decreases with pressure approximately as P-1/2; and (3) pressure and fuel stream dilution significantly affect the spatial distribution and the peak value of the soot volume fraction.
机译：在该研究中，检查了压力和燃料稀释对CoFlow层流甲烷 - 空气扩散火焰结构和几何形状的影响。一系列甲烷燃料，氮稀释的火焰已经在计算上和实验上进行研究，压力范围为1.0至2.7ATM，CH4摩尔分数范围为0.50至0.65。计算地，采用MC光滑的涡流 - 速度制剂来描述反应性气态混合物，并且通过截面气溶胶方程模拟烟灰进化。通过有限差异，在二维计算领域上离散地定向方程和边界条件，并且使用阻尼的改进的牛顿方法在所有点同时解决得到的完全耦合的完全耦合强烈的非线性方程。通过实验，采用CH *的化学发光测量来确定其相对浓度曲线和火焰前部的结构。采用薄灯丝比使用彩色数码相机的薄丝比率方法来确定非烟灰，大气压火焰的温度曲线，而使用热电偶的绝对光校准在评估烟灰温度后量化烟灰体积分数。 。对于大气和升高的压力中的广谱，检查和测量的火焰量被检查以表征压力和燃料稀释的影响，并且主要结论如下：（1）最高温度随着压力或CH 4浓度的增加而增加; （2）升降高度随着压力的增加而显着降低，改进的火焰长度大致与压力无关，并且火焰半径随压力大约为P-1/2而减小; （3）压力和燃料流稀释显着影响烟灰体积分数的空间分布和峰值。

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