Arvid Åkerblom, Martin Passad, Alessandro Ercole, N. Zettervall, E. Nilsson, C. Fureby
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引用次数: 0
摘要
随着人们对可持续民用超音速和高超音速航空的兴趣与日俱增,有必要建立可持续替代喷气燃料的燃烧模型。本研究对层流火焰、点火和喷射火焰等几种相关现象进行了数值模拟。模拟对象包括两种传统喷气燃料--喷气 A 和 JP-5,以及两种替代喷气燃料--C1 和 C5。这些燃料的层燃速度是通过骨架和详细反应机制预测的。在双模式冲压式喷气发动机的背景下预测了点火延迟时间。对航空发动机中的喷雾燃烧进行了大涡流模拟(LES),以研究替代燃料的不同热力学和化学特性如何导致不同的突发行为。为喷雾模型开发了一套新的热力学相关性。层流燃烧速度预测按燃烧热归一化,以揭示更明显的燃料趋势,其中 C1 燃烧速度最慢,C5 燃烧速度最快。点火结果凸显了负温度系数(NTC)效应、等效比和氢气富集在决定双模式冲压式喷气发动机点火时间尺度方面的作用。喷射结果表明,挥发性替代喷气燃料的穿透深度较短,化学性质最不相同的燃料(C1)的火焰在相对靠近喷射点的位置趋于稳定。
Numerical Modeling of Chemical Kinetics, Spray Dynamics, and Turbulent Combustion towards Sustainable Aviation
With growing interest in sustainable civil supersonic and hypersonic aviation, there is a need to model the combustion of alternative, sustainable jet fuels. This work presents numerical simulations of several related phenomena, including laminar flames, ignition, and spray flames. Two conventional jet fuels, Jet A and JP-5, and two alternative jet fuels, C1 and C5, are targeted. The laminar burning velocities of these fuels are predicted using skeletal and detailed reaction mechanisms. The ignition delay times are predicted in the context of dual-mode ramjet engines. Large Eddy Simulations (LES) of spray combustion in an aeroengine are carried out to investigate how the different thermodynamic and chemical properties of alternative fuels lead to different emergent behavior. A novel set of thermodynamic correlations are developed for the spray model. The laminar burning velocity predictions are normalized by heat of combustion to reveal a more distinct fuel trend, with C1 burning slowest and C5 fastest. The ignition results highlight the contributions of the Negative Temperature Coefficient (NTC) effect, equivalence ratio, and hydrogen enrichment in determining ignition time scales in dual-mode ramjet engines. The spray results reveal that the volatile alternative jet fuels have short penetration depths and that the flame of the most chemically divergent fuel (C1) stabilizes relatively close to the spray.
期刊介绍:
Aerospace is a multidisciplinary science inviting submissions on, but not limited to, the following subject areas: aerodynamics computational fluid dynamics fluid-structure interaction flight mechanics plasmas research instrumentation test facilities environment material science structural analysis thermophysics and heat transfer thermal-structure interaction aeroacoustics optics electromagnetism and radar propulsion power generation and conversion fuels and propellants combustion multidisciplinary design optimization software engineering data analysis signal and image processing artificial intelligence aerospace vehicles'' operation, control and maintenance risk and reliability human factors human-automation interaction airline operations and management air traffic management airport design meteorology space exploration multi-physics interaction.