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首页> 外文期刊>Journal of Heat Transfer >A Semi-Analytical Model for Evaporating Fuel Droplets
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A Semi-Analytical Model for Evaporating Fuel Droplets

机译：蒸发燃料液滴的半分析模型

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摘要

An algorithm for solution of a model for heating and evaporation of a fuel droplet has been developed. The objective of the work is to develop a computationally economic solution module for simulating droplet evaporation that can be incorporated in spray combustion CFD model that handles a large number of droplets. The liquid-phase transient diffusive equation has been solved semi-analytically, which involves a spatially closed-form and temporally discretized solution procedure. The model takes into account droplet surface regression, nonunity gas-phase Lewis number and variation of latent heat with temperature. The accuracy of the model is identical to a Finite Volume solution obtained on a very fine nonuniform grid, but the computational cost is significantly less, making this approach suitable for use in a spray combustion code. The evaporation of isolated heptane droplet in a quiescent ambient has been investigated for ambient pressures of 1 to 5 bar.
机译：已经开发出用于求解燃料液滴的加热和蒸发的模型的算法。这项工作的目的是开发一种用于模拟液滴蒸发的计算经济的解决方案模块，该模块可并入处理大量液滴的喷雾燃烧CFD模型中。液相瞬态扩散方程已半解析求解，涉及空间封闭形式和时间离散的求解过程。该模型考虑了液滴表面回归，气相不均匀路易斯数和潜热随温度的变化。该模型的准确性与在非常细的非均匀网格上获得的有限体积解决方案相同，但是计算成本明显较低，这使该方法适合用于喷雾燃烧法。已经研究了在1至5 bar的环境压力下在静态环境中分离出的庚烷液滴的蒸发情况。

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