Hi'/> Numerical study on the influence of turbulence on the pyrolysis of hydrocarbon fuel in mini-channel
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Numerical study on the influence of turbulence on the pyrolysis of hydrocarbon fuel in mini-channel

机译：湍流对微通道碳氢燃料热解影响的数值研究

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Highlights•A layer distribution of reaction rate with great gradient is formed near wall.•Relative rate of reaction rate and mixing presents multi-scale in radial direction.•Pyrolysis is controlled by mixing near wall but by chemical kinetics in core flow.•Increase in turbulent intensity enhances utilization of chemical absorption capacity.AbstractThe turbulent heat convection with pyrolysis is very complicated and occurs in cooling system of hypersonic aircraft with hydrocarbon fuel as the coolant. Since the mixing controlled by turbulence directly affects the reaction and leads to variations in both conversion and selectivity, a 2D numerical model was established to study the influences of turbulence on the pyrolysis of hydrocarbon fuel in mini-channel. The numerical results indicated that the turbulence enhanced the heat and mass transfer in core flow. And turbulence became weak as closing to the wall, which leads to a layer distribution of reaction rate with great gradient forming near the wall. So the distribution of the reaction rate in core flow is more uniform compared with that near the wall. According to analyze the radial distribution of relative rate of that between reaction rate and mixing, the result showed that relative rate presented multi-scale in radial direction under the influence of turbulence. In addition, the increase in turbulent intensity was beneficial to the increase in uniformity of radial distribution of conversion, which was helpful to enhance the utilization level of chemical absorption capacity of fuel.
机译： 突出显示 • 在壁面附近形成了具有较大梯度的反应速率层分布。 • 相对于反应速率和混合速率， • 热解作用是通过在壁附近混合，但通过岩心流中的化学动力学来控制的。 < ce：label>• 湍流强度增加可提高利用率 摘要 带有热解作用的湍流热对流非常复杂，发生在以碳氢燃料为冷却剂的高超音速飞机的冷却系统中。由于湍流控制的混合直接影响反应并导致转化率和选择性的变化，因此建立了二维数值模型来研究湍流对微通道中烃类燃料热解的影响。数值结果表明，湍流增强了岩心流中的传热和传质。湍流随着靠近壁而变弱，这导致反应速率的层分布在壁附近形成大梯度。因此，与壁附近的反应速率相比，堆芯反应速率的分布更加均匀。通过分析反应速率和混合速率之间的相对比例的径向分布，结果表明，在湍流的影响下，相对比例在径向上呈多尺度分布。另外，湍流强度的增加有利于转换径向分布均匀性的提高，有利于提高燃料化学吸收能力的利用水平。

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