A 5-D Implementation of FGM for the Large Eddy Simulation of a Stratified Swirled Flame with Heat Loss in a Gas Turbine Combustor.
A 5-D Implementation of FGM for the Large Eddy Simulation of a Stratified Swirled Flame with Heat Loss in a Gas Turbine Combustor.
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DOI：
10.1007/s10494-016-9777-7
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
H de Goey LP
中科院分区：
文献类型：
--
作者：
Donini A;M Bastiaans RJ;van Oijen JA;H de Goey LP
预计数值模拟将在不久的将来大大提高燃气轮机燃烧器的效率。随着数值方法、湍流模型和计算能力的不断提高，大涡模拟（LES）已被应用于真实的冷态流动工业中。然而，燃气轮机燃烧过程的详细模拟仍然是禁止的，因为其巨大的计算成本。为了降低工程应用中火焰模拟的成本，已经开发了几种数值模型。在本文中，小火焰产生的歧管（FGM）化学还原技术的实施和逐步扩展，包括所有的燃烧功能，通常观察到在固定的燃气轮机燃烧。这些包括分层效应、热损失和湍流。化学表示包括三个控制变量：反应演化由反应进程变量描述，热损失由焓描述，分层效应由混合分数表示。化学和湍流之间的相互作用被认为是通过一个假定的β形概率密度函数（PDF）的方法，这是考虑的进展变量和混合分数，最终获得一个5-D流形。目前还没有将功能梯度材料与热损失、燃料分层和湍流相结合应用的文献。为此，在燃气涡轮机燃烧室中的高度湍流和旋转火焰计算通过本5-D FGM实现耦合到LES湍流模型，并与实验数据的结果进行了比较。在一般情况下，该模型给出了一个相当好的协议与实验数据。结果表明，列入热损失大大提高了在整个燃烧器的温度预测，并导致大大改善NO的预测。FGM作为燃烧模型的使用表明，在燃气涡轮机条件下的燃烧特征可以令人满意地再现与合理的计算工作。所实施的燃烧模型保留了详细模拟的大部分物理准确性，同时大大减少了计算时间，为更清洁，更高效的燃烧中替代燃料的新发展铺平了道路。
Numerical simulations are foreseen to provide a tremendous increase in gas-turbine burners efficiency in the near future. Modern developments in numerical schemes, turbulence models and the consistent increase of computing power allow Large Eddy Simulation (LES) to be applied to real cold flow industrial applications. However, the detailed simulation of the gas-turbine combustion process remains still prohibited because of its enormous computational cost. Several numerical models have been developed in order to reduce the costs of flame simulations for engineering applications. In this paper, the Flamelet-Generated Manifold (FGM) chemistry reduction technique is implemented and progressively extended for the inclusion of all the combustion features that are typically observed in stationary gas-turbine combustion. These consist of stratification effects, heat loss and turbulence. Three control variables are included for the chemistry representation: the reaction evolution is described by the reaction progress variable, the heat loss is described by the enthalpy and the stratification effect is expressed by the mixture fraction. The interaction between chemistry and turbulence is considered through a presumed beta-shaped probability density function (PDF) approach, which is considered for progress variable and mixture fraction, finally attaining a 5-D manifold. The application of FGM in combination with heat loss, fuel stratification and turbulence has never been studied in literature. To this aim, a highly turbulent and swirling flame in a gas turbine combustor is computed by means of the present 5-D FGM implementation coupled to an LES turbulence model, and the results are compared with experimental data. In general, the model gives a rather good agreement with experimental data. It is shown that the inclusion of heat loss strongly enhances the temperature predictions in the whole burner and leads to greatly improved NO predictions. The use of FGM as a combustion model shows that combustion features at gas turbine conditions can be satisfactorily reproduced with a reasonable computational effort. The implemented combustion model retains most of the physical accuracy of a detailed simulation while drastically reducing its computational time, paving the way for new developments of alternative fuel usage in a cleaner and more efficient combustion.
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