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Numerical investigation of vibrational relaxation coupling with turbulent mixing

机译：湍流耦合的振动松弛耦合数值研究

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In flows where the relaxation rate of vibrational motion of the molecules to equilibrium is comparable to the flow through time scales, the presence of turbulence can alter the mixing and equilibration process. To understand the coupling between mixing and vibrational relaxation, a novel state-specific species model is solved in a background turbulent flow. The method is applied to mixing of two nitrogen streams at different static temperatures. The relaxation rates for each state are computed using quasi-classical trajectory analysis. For the flow conditions considered, the first ten vibrational levels are computed in the flow solver.The direct numerical simulation shows that population in different vibrational levels are significantly affected by turbulence and that the local distribution becomes non-Boltzmann. In certain locations in the jet, the population from the direct calculation can be several orders of magnitude different than the local-temperature based Boltzmann level. Last, while the bulk vibrational energy is inferior to its local equilibrium value throughout the mixing layer, the high energy level populations (levels 3 to 8) are on the opposite always over-populated. As chemical reactions are affected by these high vibrational energy populations, a simple temperature model would under-estimate the impact of nonequilibrium on combustion.
机译：在分子的振动运动达到平衡的弛豫速率与通过时间尺度的流相当的流中，湍流的存在会改变混合和平衡过程。为了理解混合和振动弛豫之间的耦合，在背景湍流中求解了一个新的特定于状态的物种模型。该方法适用于在不同的静态温度下混合两种氮气流。使用准经典轨迹分析计算每种状态的弛豫率。对于考虑的流动条件，在流动求解器中计算了前十个振动水平。直接数值模拟表明，不同振动水平下的总体受湍流的影响很大，并且局部分布变为非玻耳兹曼状态。在喷气机的某些位置，直接计算得出的总体可能与基于局部温度的玻尔兹曼能级相差几个数量级。最后，虽然整个振动层的整体振动能均低于其局部平衡值，但相反，高能级总体（3至8级）却总是人口过多。由于化学反应受这些高振动能量的影响，因此简单的温度模型会低估非平衡对燃烧的影响。

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