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Evaluation of reduced-order kinetic models for HTPB-oxygen combustion using LES

机译：使用LES评估HTPB氧气燃烧的降阶动力学模型

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摘要

This investigation analyses three finite-rate chemistry mechanisms of 2, 4 and 6 steps to simulate the combustion process in hybrid propellant rockets of HTPB-based (solid fuel) and gaseous oxygen. Computational Fluid Dynamics is used to compare the predictions with the available experimental data of a small channel-like burner intended for reactive flow characterisation, hence to assess the pros and cons of accepting extra complexity into the chemistry model in practical engineering computations. To better isolate the effect of modelling reacting flow with different chemistry models, the frame of Large Eddy Simulation (LES) of FLUENT has been used to resolve the time-spatial evolution of the gas mixture of pyrolysed fuel (modelled as polybutadiene, which is the major species of the thermal decomposition) and a stream of oxygen injected at the head-end of the combustor. The flow exhibits a mixing layer which evolves over and downstream the solid fuel block as a result of the interaction with the vortical structures. The LES methodology is affordable because of the small Reynolds number of the conducted experiments, which corresponds to the range Re similar to 2000 to 8000. A set of simulations have been accomplished for each chemical mechanism with oxygen inflow velocities of 2 to 10 m/s. Being the focus to assess the behaviour of the finite-rate mechanisms, fuel regression rate has been prescribed accordingly to available empirical data. Radiation effects are not taken into account, justified by the small scale of the combustion region.
机译：这项研究分析了2、4和6步的三种有限速率化学机理，以模拟HTPB基（固体燃料）和气态氧混合动力火箭的燃烧过程。计算流体动力学用于将预测结果与旨在进行反应性流量表征的小通道状燃烧器的可用实验数据进行比较，从而评估在实际工程计算中将额外复杂性纳入化学模型的利弊。为了更好地隔离使用不同化学模型对反应流进行建模的效果，FLUENT的大涡模拟（LES）框架已用于解决热解燃料（建模为聚丁二烯）的气体混合物随时间的演变。主要的热分解物质）和在燃烧器前端注入的氧气流。该流表现出混合层，该混合层由于与涡旋结构的相互作用而在固体燃料块上方和下游演化。 LES方法可负担得起，因为进行的实验的雷诺数小，其对应的Re范围类似于2000到8000。对于每种化学机理，已经完成了一组模拟，氧气流入速度为2至10 m / s。 。作为评估有限速率机制行为的重点，已根据可得的经验数据对燃料回归速率进行了规定。没有考虑到辐射效应，因为燃烧区域的规模很小。

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