LES/CMC Simulations of Swirl-Stabilised Ethanol Spray Flames Approaching Blow-Off.
LES/CMC Simulations of Swirl-Stabilised Ethanol Spray Flames Approaching Blow-Off.
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DOI：
10.1007/s10494-016-9762-1
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
Mastorakos E
中科院分区：
文献类型：
--
作者：
Giusti A;Kotzagianni M;Mastorakos E
大涡模拟（LES）与条件矩封闭（CMC）燃烧模型的旋流乙醇喷雾火焰已进行了接近吹离的条件下，一个广泛的数据库的实验测量火焰和喷雾特性。CMC方程的解利用了具有化学源项的一阶封闭的三维非结构化代码。结果表明，LES/CMC是能够正确地捕捉在不同的条件下的火焰结构，并同意合理以及与测量的平均火焰形状和动态行为的火焰评价方面的局部反射和统计的抬离高度。实验测量的整体（液体加气体）的混合物馏分，使用激光诱导击穿光谱技术，也包括允许进一步评估和验证的数值方法。模拟结果的各种边界条件的敏感性进行了讨论。
Large Eddy Simulations (LES) with the Conditional Moment Closure (CMC) combustion model of swirling ethanol spray flames have been performed in conditions close to blow-off for which a wide database of experimental measurements is available for both flame and spray characterization. The solution of CMC equations exploits a three-dimensional unstructured code with a first order closure for chemical source terms. It is shown that LES/CMC is able to properly capture the flame structure at different conditions and agrees reasonably well with the measurements both in terms of mean flame shape and dynamic behaviour of the flame evaluated in terms of local extinctions and statistics of the lift-off height. Experimental measurements of the overall (liquid plus gaseous) mixture fraction, performed using the Laser-Induced Breakdown Spectroscopy technique, are also included allowing further assessment and validation of the numerical method. The sensitivity of the simulation results to the various boundary conditions is discussed.
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