Experimental and numerical study on ethanol and dimethyl ether lifted flames in a hot vitiated co-flow
Experimental and numerical study on ethanol and dimethyl ether lifted flames in a hot vitiated co-flow
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乙醇和二甲醚在热污染共流中起火的实验和数值研究
DOI：
10.1016/j.fuel.2016.07.064
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发表时间：
2016-11
期刊：
影响因子：
7.4
通讯作者：
Hu Zongjie
中科院分区：
文献类型：
--
作者：
Wu Zhijun;Zhang Qing;Bao Tangtang;Li Liguang;Deng Jun;Hu Zongjie
喷入热同向流动的乙醇和二甲醚(DME)升起的火焰被高速相机记录下来。在966~1149℃的同向流动温度范围内，在1atm的环境压力下，研究了两种燃料在433℃时的火焰。实验结果表明，同向流动温度对射流火焰特性有很大影响。结果表明，升程高度主要由点火延迟期控制，而起升高度的波动主要受点火延迟期对同向流动温度的敏感性控制。采用详细的反应机理，建立了雷诺平均N-S方程(RANS)和涡耗散概念模型(EDC)的耦合数值模拟，与实验结果得到的火焰结构和升空高度基本一致。重要参数的径向分布和轴向分布揭示了放热反应对混合过程的加速作用，反映了简单燃料(H_2和CH_4)与现有燃料在稳定点混合分数上的差异。讨论了化学反应对低、高同向流动温度下稳定化机理的影响。
Lifted flames of gaseous ethanol and dimethyl ether (DME) issuing into a hot co-flow are recorded with a high-speed camera. The flames of the two fuels at 433 K are studied in a co-flow temperature range from 966 K to 1149 K and at an ambient pressure of 1 atm. The experimental results show that the co-flow temperature has a substantial influence on the jet flame characteristics. It is concluded that the lift-off height is controlled by the ignition delay, whereas the fluctuation is mainly controlled by the sensitivity of the ignition delay to the co-flow temperature. A numerical study coupling the Reynolds averaged Navier-Stokes (RANS) equation with the eddy-dissipation-concept model (EDC) employing detailed reaction mechanisms is established and is consistent with the previous flame structure and lift-off height obtained by the experimental results. The radial profiles and axial distribution of important parameters reveal the acceleration of the mixing process caused by exothermic reactions and indicate the differences in the mixture fraction at the stabilization points between simple fuel (H2and CH4) and the present fuels. The influences of the chemical reaction on the stabilization mechanism at low and high co-flow temperatures are also discussed.
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