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首页> 外文会议>New beginnings: challenges for aerospace innovation >THEORETICAL INVESTIGATION OF THE PERFORMANCE OF ALTERNATIVE AVIATION FUELS IN AN AERO-ENGINE COMBUSTION CHAMBER
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THEORETICAL INVESTIGATION OF THE PERFORMANCE OF ALTERNATIVE AVIATION FUELS IN AN AERO-ENGINE COMBUSTION CHAMBER

机译：航空发动机燃烧室替代航空燃料性能的理论研究

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When considering alternative fuels for aviation, factorsrnsuch as the overall efficiency of the combustion process and thernlevels of emissions emitted to the atmosphere, need to berncritically evaluated. The physical and chemical properties of arnfuel influence the combustion efficiency and emissions andrntherefore need to be considered. The energy content of arnbiofuel, which is influenced negatively by the presence ofrnoxygen in the molecular structure (I.e. oxygenated chemicalrncompounds), is relatively low when compared with that ofrnconventional jet fuel. This means that the overall efficiency ofrnthe process will be different. In this paper two possible scenariosrnhave been investigated in order to assess the potential torndirectly replace conventional jet fuel with Methyl Buthanoate -rnMB (a short chain FAME representing biofuel) and a syntheticrnjet fuel (FT fuel) using Computational Fluid Dynamics (CFD)rnmodelling in a typical Modern Air-Spray Combustor (MAC). Inrnaddition the impact of fuel blending on the combustionrnperformance has been investigated.rnComputational Fluid Dynamics (CFD) has been verified andrnvalidated over past decades to be a powerful design tool inrnindustries where experimental work can be costly, hazardousrnand time consuming, to support the design and developmentrnprocess. With recent developments in processor speeds andrnsolver improvements, CFD has been successfully validated andrnused as a tool for optimizing combustor technology. Combustionrnof each fuel is calculated using a mixture fraction/pdf approachrnand the turbulence-chemistry interaction has been modelledrnusing the Laminar Flamelet approach. Detailed chemicalrnreaction mechanisms, developed and validated recently by thernauthors for aviation fuel including kerosene, synthetic fuel andrnbio-aviation fuel have been employed in the CFD modelling. Arndetailed comparison of kerosene with alternative fuelrnperformance has been made.
机译：在考虑航空替代燃料时，需要严格评估诸如燃烧过程的整体效率和向大气排放的排放水平等因素。无核燃料的物理和化学性质影响燃烧效率和排放，因此需要考虑。与分子式喷气燃料相比，在分子结构中被氮氧（即氧化的化学化合物）存在不利影响的生物燃料的能量含量相对较低。这意味着该过程的整体效率将有所不同。在本文中，已经研究了两种可能的情况，以评估使用丁烷酸甲酯-rnMB（代表生物燃料的短链FAME）和合成喷气燃料（FT燃料）直接在飞机中使用计算流体动力学（CFD）模型进行建模的可能性。典型的现代空气喷雾燃烧器（MAC）。此外，还研究了燃料混合对燃烧性能的影响。在过去的几十年中，计算流体动力学（CFD）已得到验证和验证，是一种功能强大的设计工具，在工业中，实验工作可能是昂贵，危险且费时的，以支持设计和开发过程。随着处理器速度的最新发展和求解器的改进，CFD已被成功验证并用作优化燃烧器技术的工具。使用混合分数/ pdf方法计算每种燃料的燃烧率，并使用层流小火焰方法对湍流-化学相互作用进行建模。最近，由作者开发并验证的航空燃料（包括煤油，合成燃料和生物航空燃料）的详细化学反应机制已用于CFD模拟中。进行了煤油与替代燃料性能的详细比较。

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