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首页> 外文期刊>Combustion and Flame >Counterflow diffusion flames of general fluids: Oxygen/hydrogen mixtures
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Counterflow diffusion flames of general fluids: Oxygen/hydrogen mixtures

机译：普通流体的逆流扩散火焰：氧气/氢气混合物

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A comprehensive framework has been established for studying laminar counterflow diffusion flames for general fluids over the entire regime of thermodynamic states. The model incorporates a unified treatment of fundamental thermodynamic and transport theories into an existing flow solver DMCF to treat detailed chemical kinetic mechanisms and multispecies transport. The resultant scheme can thus be applied to fluids in any state. Both subcritical and supercritical conditions are considered. As a specific example, diluted and undiluted H_2/O_2 flames are investigated at pressures of 1-25 MPa and oxygen inlet temperatures of 100 and 300 K. The effects of pressure p and strain rate ∈_S on the heat release rate q_s, extinction limit, and flame structure are examined. In addition, the impact of cross-diffusion terms, such as the Soret and Dufour effects, on the flame behavior is assessed. Results indicate that the flame thickness δ_f and heat release rate correlate well with the square root of the pressure multiplied by the strain rate as δ_f ～ 1/(P∈_S)~(1/2) and q_s ～( P∈_s)~(1/2), respectively. The strain rate at the extinction limit exhibits a quasi-linear dependence on p. Significant real-fluid effects take place in the transcritical regimes, as evidenced by the steep property variations in the local flowfield. However, their net influence on the flame properties appears to be limited due to the ideal-gas behavior of fluids in the high-temperature zone.
机译：已经建立了用于研究在整个热力学状态范围内的普通流体的层流逆流扩散火焰的综合框架。该模型将对基本热力学和传输理论的统一处理纳入到现有的流量求解器DMCF中，以处理详细的化学动力学机制和多物种传输。因此，所得方案可以应用于任何状态的流体。亚临界和超临界条件都被考虑。作为一个具体示例，研究了在1-25 MPa的压力和100和300 K的氧气入口温度下稀释和未稀释的H_2 / O_2火焰。压力p和应变率∈_S对放热率q_s，消光极限的影响，并检查火焰结构。此外，还评估了交叉扩散项（例如Soret和Dufour效应）对火焰行为的影响。结果表明，火焰厚度δ_f和放热率与压力平方根乘以应变率δ_f〜1 /（P∈_S）〜（1/2）和q_s〜（P∈_s）〜相关性很好。 （1/2）。消光极限处的应变率表现出对p的准线性依赖性。跨临界状态下会发生明显的实际流体效应，这在局部流场中的陡峭特性变化中得到了证明。但是，由于在高温区域中流体的理想气体行为，它们对火焰特性的净影响似乎受到限制。

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