Hybrid RANS/LES of a supersonic combustor
Hybrid RANS/LES of a supersonic combustor
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DOI：
10.2514/6.2008-6923
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发表时间：
2008
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影响因子：
--
通讯作者：
D. Peterson;G. Candler
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文献类型：
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作者：
D. Peterson;G. Candler
介绍了超燃冲压发动机冲壁燃油喷射模拟的初步结果。模拟使用混合雷诺平均Navier-Stokes和大涡模拟方法，其中RANS模式的主要功能是作为大涡模拟的壁模型。该混合方法是基于延迟分离涡模拟制定，并包括作为一个壁建模大涡模拟功能的改进。氢-空气化学的七组分八反应机理与流解器耦合。这里给出的结果不包括次网格的双折射-化学相互作用的影响。本文比较了超声速横流中氢横向喷流的瞬时结构和点火特性与平面激光诱导OH自由基发光。所使用的化学机制导致射流自燃。模拟结果很好地再现了实验中观察到的OH的薄的、褶皱的悲叹。还模拟了一个模型氢动力超燃冲压发动机燃烧室，该燃烧室有温度和组分浓度的内部测量，以及壁面压力测量。在模拟过程中，燃烧室中出现了一个燃烧前缘，并向上游传播.截至本文撰写之时，战线仍在向上游推进。讨论了燃烧前沿的发展，并与实验数据作了初步比较。最初的比较是有希望的，显示出的平均流量是定性类似的实验测量。
Preliminary results from simulations modeling ush wall fuel injection in scramjet engines is presented. The simulations use a hybrid Reynolds-averaged Navier-Stokes and large eddy simulation methodology, where the primary function of the RANS mode is to act as a wall model for the large eddy simulation. The hybrid method is based on the delayed detached-eddy simulation formulation and includes improvements for functioning as a wall-modeled large eddy simulation. A seven species, eight reaction mechanism for hydrogen-air chemistry is coupled with the ow solver. The results presented here do not include the eects of subgrid turbulence-chemistry interaction. The instantaneous structure and ignition characteristics of a transverse jet of hydrogen in a supersonic crossow is compared to planar laser induced uorescence of OH radicals. The chemical mechanism used results in autoignition of the jet. The thin, wrinkled lament of OH observed in the experiment is reproduced well by the simulation. A model hydrogen-powered scramjet combustor for which there are internal measurements of temperature and species concentration, as well as wall pressure measurements, was also simulated. Well into the simulation a combustion front develops within the combustor that propagates upstream. As of the time this paper was written, the front is still moving upstream. The development of the combustion front it discussed and initial comparisons to the experimental data are made. The initial comparisons are promising, showing mean ow quantities that are qualitatively similar to what is measured experimentally.