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针对高温气流中燃料液滴的受热蒸发过程,以正十二烷液滴为例,建立了考虑液滴受热膨胀、表面张力及气流热物性变化的分析模型。采用移动网格法,并通过温度插值减小网格移动产生的偏差,编制了计算程序。在与文献结果对比验证的基础上,数值模拟了高温对流环境中的液滴蒸发过程;探讨了高温气流加热条件下,液滴表面张力变化对液滴蒸发的影响。结果表明,是否考虑液滴表面张力及其随温度变化,对液滴内压和蒸发过程的影响不大。
Aiming at the evaporation process of fuel droplets in high temperature gas flow, taking n-dodecane as an example, an analytical model considering the thermal expansion, surface tension and physical properties of the gas flow was established. Using the moving grid method, and through the temperature interpolation to reduce the deviation caused by grid movement, the calculation program has been prepared. Based on the comparison with the literatures, the droplet evaporation in the high temperature convection environment was numerically simulated. The influence of the droplet surface tension on the droplet evaporation was also discussed. The results show that whether or not the surface tension of droplet and its variation with temperature is considered has little effect on the droplet pressure and the evaporation process.