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Optical analysis of the liquid layer combustion of paraffin-based hybrid rocket fuels

机译：石蜡基混合火箭燃料液层燃烧的光学分析

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Liquefying hybrid rocket fuels (e.g. paraffin) enable higher regression rates due to the presence of an unstable melt layer on the fuel surface during combustion, which causes entrainment of liquid droplets into the oxidizer gas flow. In order to better understand the mechanism responsible for the droplets entrainment, the combustion behaviour of paraffin-based hybrid rocket fuels in combination with gaseous oxygen (GOX) was investigated in the framework of this research. Tests were performed in a 2D slab burner configuration at atmospheric conditions. High-speed videos were recorded and analysed with two different decomposition techniques, applied to the scalar field of the flame luminosity (the flame front is assumed to follow the liquid layer). The fuel slab composition and configuration and the oxidizer mass flow have been varied in order to study the influence of these parameters on the liquid layer instability process. The main focus of the research is to understand the relation between the unstable waves which enable the droplets entrainment process and the regression rate. The results show that the combustion is dominated by periodic, wave-like structures for all the analysed fuels. The frequencies and the wavelengths characterizing the liquid melt layer depend on the fuel viscosity and geometry and on the oxidizer mass flow. Moreover, a dependency of the regression rate on the most excited frequencies and longitudinal wavelengths was found. This is important to better understand the relation between the increased regression rate and the onset and development of the entrainment process, which is connected to the amplification of longitudinal unstable waves caused by the high velocity gas flow over the fuel surface.
机译：由于燃烧过程中燃料表面上存在不稳定的熔体层，因此液化混合火箭燃料（例如石蜡）能够实现更高的回归率，这会导致液滴夹带进入氧化剂气流。为了更好地理解引起液滴夹带的机理，在此研究的框架内，研究了石蜡基混合火箭燃料与气态氧（GOX）的燃烧行为。在大气条件下以2D平板燃烧器配置进行测试。使用两种不同的分解技术记录并分析了高速视频，并将其应用于火焰光度的标量场（假定火焰前沿跟随液体层）。为了研究这些参数对液层不稳定性过程的影响，改变了燃料板的组成和构型以及氧化剂的质量流量。研究的主要重点是了解使液滴夹带过程的不稳定波与回归速率之间的关系。结果表明，对于所有分析的燃料，燃烧均以周期性的波浪状结构为主。表征液体熔体层的频率和波长取决于燃料的粘度和几何形状以及氧化剂的质量流量。此外，发现了回归速率对最激发的频率和纵向波长的依赖性。这对于更好地了解增加的回归速率与夹带过程的开始和发展之间的关系很重要，该关系与燃料表面上高速气流所引起的纵向不稳定波的放大有关。

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