标题： 铁尘本生火焰稳定性的数值分析 显示英文标题

标题： Numerical Analysis of the Stability of Iron Dust Bunsen Flames

摘要： 本文介绍了铁尘Bunsen火焰对粒子播种变化的响应的数值模拟。使用经过验证的数值模型研究了粒子播种波动对火焰稳定性的影响。在正置和倒置配置下对Bunsen装置进行了模拟。在正置和倒置配置之间，火焰稳定性方面的火焰响应没有显著差异。我们发现Bunsen火焰对粒子负载的突然变化表现出令人惊讶的鲁棒性。粒子负载的突然变化不会激发火焰中的任何固有不稳定性。根据我们的结果，铁尘火焰对施加的波动具有鲁棒性。我们假设这是由于燃烧温度和产热率之间缺乏反馈机制。这种机制存在于传统的、由化学驱动的气体火焰中。然而，这种机制在铁尘火焰中缺失，因为单个铁颗粒的燃烧受氧气扩散限制，而氧气扩散对温度不敏感。 显示英文摘要

摘要： This article presents numerical simulations of the response of an iron dust Bunsen flame to particle seeding changes. A validated numerical model is used to study the impact of particle seeding fluctuations on flame stability. Simulations are conducted for the Bunsen setup in the right-side up and up-side down configuration. No significant differences in flame response are identified in flame stability between the right-side up and up-side down configurations. We find that the Bunsen flame is surprisingly robust to abrupt changes in particle loading. The sudden change in particle loading does not excite any intrinsic instabilities in the flame. Based on our results, the iron dust flames are robust to imposed fluctuations. We hypothesize that this is due to the lack of a feedback mechanism between the burned temperature and the heat release rate. This mechanism is present in conventional, chemistry-driven, gaseous flames. However, such a mechanism is absent in iron dust flames because the combustion of individual iron particles is limited by oxygen diffusion, which is insensitive to temperature.