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首页> 外文期刊>Combustion Science and Technology >Numerical Investigation of High Pressure CO_2-Diluted Combustion Using a Flamelet-based Approach
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Numerical Investigation of High Pressure CO_2-Diluted Combustion Using a Flamelet-based Approach

机译：使用基于燧发燧石的高压CO_2稀释燃烧的数值研究

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Direct-fired oxy-fuel combustion as a heat source is utilized in supercritical carbon dioxide (sCO(2)) power cycles, such as the Allam cycle, which has shown promise in delivering higher efficiencies while achieving the complete capture of combustion products in future generation carbon-neutral power plants. The design of dedicated burners for such cycles is key in determining their overall efficiency and viability. We present a series of numerical simulations on a prototype burner, currently in development, operating in an essentially non-premixed regime with a high pressure gaseous fuel, burning in the presence of a hot oxidant flow containing a mixture of recycled CO(2)and pure oxygen. Simulations rely on a turbulent combustion model based on a simplified approach for diluted steady laminar flamelets. We investigate the effect of the degree of dilution as well as pressure on the flame structure, revealing a concurrent change in stoichiometric mixture fraction and quenching scalar dissipation. We also assess the effect of injector recess and of swirl in the oxidizer stream.
机译：作为热源的直接烧制的氧燃料燃烧用于超临界二氧化碳（SCO（2））功率循环，例如Allam循环，这在促进了较高的效率时，在未来实现了燃烧产品的完全捕获一代碳中性发电厂。用于此类周期的专用燃烧器的设计是确定其整体效率和可行性的关键。我们在目前在开发的原型燃烧器上展示了一系列数值模拟，以高压气体燃料在基本上未预混的状态下操作，在含有再循环CO（2）的混合物的热氧化剂流动存在下燃烧纯氧。基于稀释稳态层挥体的简化方法依赖于湍流燃烧模型。我们研究了稀释程度以及压力对火焰结构的影响，揭示了化学计量分数和淬火标量耗散的同时变化。我们还评估喷射器凹槽和旋流在氧化剂流中的效果。

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