Gotoda Hiroshi, Shinoda Yuta, Kobayashi Masaki, Okuno Yuta, Tachibana Shigeru
Department of Mechanical Engineering, Ritsumeikan University, 1-1-1 Nojihigashi, Kusatsu-shi, Shiga 525-8577, Japan.
Propulsion Systems Research Group, Institute of Aeronautical Technology, Japan Aerospace Exploration Agency, 7-44-1 Jindaiji-Higashii, Chofu, Tokyo 182-8522, Japan.
Phys Rev E Stat Nonlin Soft Matter Phys. 2014 Feb;89(2):022910. doi: 10.1103/PhysRevE.89.022910. Epub 2014 Feb 11.
We propose an online method of detecting combustion instability based on the concept of dynamical system theory, including the characterization of the dynamic behavior of combustion instability. As an important case study relevant to combustion instability encountered in fundamental and practical combustion systems, we deal with the combustion dynamics close to lean blowout (LBO) in a premixed gas-turbine model combustor. The relatively regular pressure fluctuations generated by thermoacoustic oscillations transit to low-dimensional intermittent chaos owing to the intermittent appearance of burst with decreasing equivalence ratio. The translation error, which is characterized by quantifying the degree of parallelism of trajectories in the phase space, can be used as a control variable to prevent LBO.
我们提出了一种基于动态系统理论概念的在线燃烧不稳定性检测方法，包括对燃烧不稳定性动态行为的表征。作为与基础和实际燃烧系统中遇到的燃烧不稳定性相关的一个重要案例研究，我们研究了预混燃气轮机模型燃烧室中接近贫燃熄火（LBO）的燃烧动力学。由于随着当量比降低，爆燃间歇性出现，热声振荡产生的相对规则的压力波动转变为低维间歇性混沌。以相空间中轨迹平行度量化为特征的平移误差可作为防止贫燃熄火的控制变量。
