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为了获得燃料液滴对压力变化得到响应特性,从微观上对压力振荡环境下的液滴蒸发过程进行了分析。结果表明压力振荡会导致流场内部力的不平衡,从而会使液滴周围边界层内气体产生周期性流动,以及液滴周围边界层内蒸气质量分数的振荡,最终会使液滴蒸发速率的产生与压力振荡周期相同的振荡。在此基础上,根据流动边界层理论,提出了饱和蒸气边界层的概念,建立了压力振荡环境下静止液滴蒸发的准稳态模型并进行了数值求解,获得了静止液滴蒸发速率对压力振荡的响应特性。
In order to obtain response characteristics of fuel droplets to pressure changes, the evaporation process of droplets under pressure oscillation was analyzed microscopically. The results show that the pressure oscillations lead to unbalanced internal forces in the flow field, resulting in the periodic flow of gas in the boundary layer around the droplet and the oscillation of the vapor mass fraction in the boundary layer around the droplet. Eventually, the droplet evaporation rate The same oscillation as the pressure oscillation period is generated. On this basis, according to the theory of flow boundary layer, the concept of saturated vapor boundary layer is proposed and a quasi-steady state model of stationary droplet evaporation under pressure oscillation is established and numerically solved. The effect of static droplet evaporation rate on pressure Oscillation response characteristics.