AI 中文总结
研究预混火焰在二维和圆柱形通道中传播动力学，用直接数值模拟结合传导热传递，考虑不同热损失情况，对比绝热条件模拟结果，再现火焰动力学特征，突出壁热损失和几何限制对火焰动力学的综合影响。
AI 中文摘要
通过对完全可压缩反应性Navier-Stokes方程进行直接数值模拟，并结合通道壁内的传导热传递，研究了预混火焰在二维和圆柱形通道中传播的动力学。模拟采用高阶数值方法、详细化学动力学和化学计量氢-空气燃烧的传输模型。研究了不同纵横比通道中火焰传播早期热损失的影响，特别关注郁金香火焰的形成及其向扭曲郁金香结构的转变。考虑了从热燃烧产物到内壁表面的对流热传递、通过壁的热传导热传递以及外壁表面向周围环境的对流和辐射热损失来模拟热损失。将所得结果与绝热壁边界条件下的相应模拟进行比较。模拟再现了实验观察到的火焰动力学主要特征，突出了壁热损失和几何限制对受限通道中火焰动力学的综合影响。
英文摘要
The dynamics of premixed flames propagating in two-dimensional and cylindrical channels are investigated using direct numerical simulations of the fully compressible reactive Navier-Stokes equations coupled with conductive heat transfer within the channel walls. The simulations employ a high-order numerical method, detailed chemical kinetics and transport models for a stoichiometric hydrogen-air combustion. The influence of heat losses during the early stages of flame propagation is examined for channels of different aspect ratios, with particular focus on tulip flame formation and its subsequent transition to distorted tulip structures. Heat losses are modelled considering convective heat transfer from the hot combustion products to the inner wall surface, thermal conduction heat transfer through the wall, and convective and radiative heat losses from the outer wall surface to the surroundings. The obtained results are compared with corresponding simulations under adiabatic wall boundary conditions. The simulations reproduce the principal features of flame dynamics observed experimentally, highlighting the combined influence of wall heat losses and geometric confinement on flame dynamics in confined channels.
Comments33 pages, 16 figures
