This paper presents a step-forward extension of the well-known chemistry/flow interaction Eddy Dissipation Concept approach for modelling both, non-premixed and premixed, combustion regimes in a Reynolds-Averaged Navier Stokes framework. The Eddy Dissipation Concept approach and its extended versions (e.g. Partially Stirred reactors, PaSR) are widely used for CFD modelling of a variety of combustion systems. This is mainly due to their capability of incorporating chemical kinetic rates in turbulent flows. However, in defining the averaged chemical reaction rates, EDC describes the fine-scale of turbulent reacting flowfield based on the so-called mixing-rate calculated from turbulent velocity field, which consequently makes this model more suitable for diffusion flame/combustion regimes. In a recent study by the present authors, a hybrid Wrinkling-EDC approach is introduced to model fine scales of turbulent reacting flows in MILD combustion regimes based on flame surface density in premixed flame regimes and turbulent intermittency in diffusion flame regimes. In the present study, we study the performance of this newly developed approach for the simulation of conventional turbulent flames. The simulations are performed and validated using well-documented turbulent premixed and predominantly non-premixed flames (e.g. Flame F3 of Chen et al. and Sandia Flame D). In addition, all cases are simulated using a recently developed EDC model (referred to as extended EDC) along with the standard EDC version where both their results are used as a reference. The obtained results reveal better performance of the Wrinkling-EDC approach over the standard and extended versions of EDC model for the simulation of turbulent premixed flame, and a comparable performance between the extended EDC and wrinkling-EDC approach for the predictions of species concentration and temperature fields of turbulent non-premixed flames.

本文介绍了众所周知的化学/流相互作用涡流消散概念方法的逐步扩展，该方法用于在雷诺平均Navier Stokes框架中对非预混和预混燃烧模式进行建模。涡流消散概念方法及其扩展版本（例如部分搅拌反应堆，PaSR）被广泛用于各种燃烧系统的CFD模拟。这主要是由于它们能够将化学动力学速率纳入湍流中。但是，在定义平均化学反应速率时，EDC基于从湍流速度场计算出的所谓混合速率来描述湍流反应流场的精细尺度，因此使该模型更适合于扩散火焰/燃烧状态。在当前作者的最新研究中，引入了一种混合起皱-EDC方法，该模型基于预混合火焰模式下的火焰表面密度和扩散火焰模式下的湍流间歇性，在MILD燃烧模式下对湍流反应流的精细尺度进行建模。在本研究中，我们研究了这种新开发的方法对常规湍流火焰进行仿真的性能。使用已充分记录的湍流预混和主要是非预混火焰（例如Chen等人的Flame F3和Sandia Flame D）进行了仿真并进行了验证。此外，所有情况均使用最近开发的EDC模型（称为扩展EDC）以及标准EDC版本（其中两个结果均用作参考）进行模拟。