Recent Advances in Understanding of Thermal Expansion Effects in Premixed Turbulent Flames
Recent Advances in Understanding of Thermal Expansion Effects in Premixed Turbulent Flames
复制标题
DOI：
10.1146/annurev-fluid-010816-060104
复制
发表时间：
2017-01
影响因子：
27.7
通讯作者：
V. Sabelnikov;A. Lipatnikov
中科院分区：
文献类型：
--
作者：
V. Sabelnikov;A. Lipatnikov
当预混火焰在湍流中传播时，湍流不仅影响燃烧速率（例如，通过燃烧火焰和增加其表面积），而且火焰中的热释放扰动压力场，并且这些压力扰动影响湍流和标量输运。例如，后者的影响表现在所谓的反梯度湍流标量通量，这已被记录在各种火焰，并已挑战燃烧社区约35年。在过去的十年中，在研究（a）预混火焰中的热膨胀对火焰刷内湍流流动和湍流标量输运的影响，以及（B）反梯度标量输运对湍流燃烧速率的反馈影响方面取得了实质性进展。本文综述了这一领域的最新进展，并概述了未来研究中有待解决的问题。
When a premixed flame propagates in a turbulent flow, not only does turbulence affect the burning rate (e.g., by wrinkling the flame and increasing its surface area), but also the heat release in the flame perturbs the pressure field, and these pressure perturbations affect the turbulent flow and scalar transport. For instance, the latter effects manifest themselves in the so-called countergradient turbulent scalar flux, which has been documented in various flames and has challenged the combustion community for approximately 35 years. Over the past decade, substantial progress has been made in investigating (a) the influence of thermal expansion in a premixed flame on the turbulent flow and turbulent scalar transport within the flame brush, as well as (b) the feedback influence of countergradient scalar transport on the turbulent burning rate. The present article reviews recent developments in this field and outlines issues to be solved in future research.