A nonlinear model for ducted flame combustion instabilities
A nonlinear model for ducted flame combustion instabilities
复制标题
管道火焰燃烧不稳定性的非线性模型
DOI：
--
复制
发表时间：
1988
期刊：
影响因子：
--
通讯作者：
S. Candel
中科院分区：
文献类型：
--
作者：
T. Poinsot;S. Candel
摘要本文对预混湍流燃烧室的低频燃烧不稳定性进行了直接模拟。仿真是基于Marble和Candel在研究冲压发动机和加力燃烧室不稳定性时提出的薄火焰片（TFS）模型。对该模型进行了数值求解，以便对任何激励下的火焰响应进行预测。数值计算是用原始的隐式扩展的两相行TRAC方法进行的。通过与声波在等温管道中传播的精确解的比较，得到了该格式的数值性质（色散、耗散）。反应排的结果表明，稳定性主要取决于定常流动结构和用来表示压力对局部法向火焰速度影响的相互作用参数。四分之一波激发引起的不稳定性最强的当对流扰动在火焰前传播时与…
Abstract This paper presents a direct simulation of low frequency combustion instabilities in premixed turbulent combustors. The simulation is based on the thin flame sheet (TFS) model proposed by Marble and Candel in their investigation of ramjet and afterburner instabilities. This model is solved numerically to allow the prediction of the flame response to any excitation. The numerical calculations are performed with an original implicit extension of a two phase Row TRAC method. The numerical properties of the scheme (dispersion, dissipation) are obtained by comparison with exact solutions in the case of acoustic wave propagations in isothermal ducts. Results obtained for reactive Rows show that stability is mainly determined by the steady flow configuration and by the interaction parameter introduced to represent the effects of pressure on the local normal flame speed. Quarter-wave excitations induce the strongest instabilities when convective perturbations travelling on the flame front couple with the...