论文部分内容阅读
为了准确描述湿蒸汽两相流中水滴生长过程,以提高数值模拟的精度和可信度,基于传热传质平衡耦合求解方法提出一种水滴生长模型。将建立的模型与目前湿蒸汽两相流计算中广泛使用的几种水滴生长模型进行了对比分析,结果显示在整个克努森数Kn变化范围内,该模型表现良好,明显优于其他模型,特别是在过渡区内具有很高的精确性。同时为了揭示不同水滴生长模型对两相参数的影响,采用各水滴生长模型对一维拉瓦尔Laval喷管中存在的自发凝结的湿蒸汽流动进行数值模拟。结果表明,不同水滴生长率模型对液相成核率、水滴数、水滴半径的影响非常明显,但对蒸汽湿度影响较小。
In order to accurately describe the water droplet growth process in wet steam two-phase flow, in order to improve the accuracy and reliability of numerical simulation, a droplet growth model was proposed based on coupled heat and mass transfer equilibrium method. The model was compared with several widely used water droplet growth models in the calculation of two-phase flow in wet steam. The results show that the model performs well over the entire Knudsen number range, which is obviously better than other models. Especially in the transition zone with high accuracy. At the same time, in order to reveal the influence of different water droplet growth models on the two-phase parameters, the model of each droplet growth was used to simulate the wet steam flow in one-dimensional Laval nozzle. The results show that the effects of different water droplet growth rate models on nucleation rate, water droplet number and water droplet radius are obvious, but have little effect on steam humidity.