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<p>To improve the understanding of combustion dynamics in large industrial systems, two hot blast stove designs, C1 and C2, are analysed on their linear thermoacoustic stability. In the first part, the Flame Transfer Function (FTF) is computed using Scale Adaptive Simulations, with a flamelet generated manifold model for the combustion. The fuel mass flows of the non-premixed flames are forced using a superposition of sine waves, with 16 points throughout the frequency range. The results show large differences in flame shape between the two burner designs. Most notably, the larger number of reactant ports reduces the flame length in C2. The convective time delay describes the lag between forcing at the fuel inlet and response in the total flame. Due to the smaller flame length this reduces form 95 ms in C1 to 40 ms in C2. The gain generally shows low-pass behaviour with local maxima and minima. It is shown the response of flame surface area quickly vanishes for higher frequencies, while mass burning rate fluctuations are thought to govern the overall response. Next, the FTF is applied in an acoustic network model to compute the linear stability of the complete system. The model predicts unstable modes for C1 but (marginally) stable modes for C2. This mode prediction is in good agreement with experimental pressure measurements.</p>

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Linear Thermoacoustic Stability Prediction for Two Hot Blast Stove Burner Designs Using a CFD-Based Flame Transfer Function

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年9月8日

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  • Jesse W. Hofsteenge,
  • Jim B. W. Kok

摘要

To improve the understanding of combustion dynamics in large industrial systems, two hot blast stove designs, C1 and C2, are analysed on their linear thermoacoustic stability. In the first part, the Flame Transfer Function (FTF) is computed using Scale Adaptive Simulations, with a flamelet generated manifold model for the combustion. The fuel mass flows of the non-premixed flames are forced using a superposition of sine waves, with 16 points throughout the frequency range. The results show large differences in flame shape between the two burner designs. Most notably, the larger number of reactant ports reduces the flame length in C2. The convective time delay describes the lag between forcing at the fuel inlet and response in the total flame. Due to the smaller flame length this reduces form 95 ms in C1 to 40 ms in C2. The gain generally shows low-pass behaviour with local maxima and minima. It is shown the response of flame surface area quickly vanishes for higher frequencies, while mass burning rate fluctuations are thought to govern the overall response. Next, the FTF is applied in an acoustic network model to compute the linear stability of the complete system. The model predicts unstable modes for C1 but (marginally) stable modes for C2. This mode prediction is in good agreement with experimental pressure measurements.