Influence of Auto-Ignition on the Driving Mechanisms Leading to High Frequency Combustion Instabilities in Premixed Turbulent Flames

在充分利用两级稀薄再热燃烧进一步减少污染物排放的潜力之前，必须开发出避免这种燃烧系统中高频（HF）燃烧不稳定性的合适策略。在这种情况下，基础研究的挑战是确定机制，导致损失的稳定性和关闭目前的差距，在高频不稳定性的建模，通过提供失踪的模型，声学火焰反馈和有效的稳定性分析方法。拟议的研究旨在提供数据，从一个新的测试设备的独特的声学设计，这是专门设计的高频不稳定性研究（部分）自动点火稳定火焰。迄今为止，该平台已成功投入使用，并首次在拟议项目中使用。实验数据将用于进一步开发模拟方法，特别是用于推导适合于线性建模框架的稳定性分析的火焰动力学模型。

Before the full potential of two-stage lean reheat combustion for further reduction of pollutant emissions can be exploited, suitable strategies for avoiding high frequency (HF) combustion instabilities in such combustion systems must be developed. In this context the challenge for basic research is to identify the mechanisms leading to loss of stability and to close the current gap in modelling of HF-instabilities by providing the missing models on acoustic flame feedback and effective stability analysis methods. The proposed research aims at providing data from a novel test facility of unique acoustic design, which has been particularly designed for HF instability research of (partially) auto-ignition stabilized flames. This platform has been successfully commissioned so far and it is operational for being used in the proposed project for the first time. The experimental data will be employed for the further development of simulation methods and in particular for the derivation flame dynamics models suited for stability analyses with linear modelling frameworks.