Numerical Analysis of Dynamic and Heat Transfer Characteristics of Droplet Sprayed in Pressurizer
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摘要: 建立单颗粒球形液滴在饱和蒸汽相中的动力模型及其与饱和蒸汽之间的非稳态传热模型,并根据特性方程,用fortran语言编写计算机程序。对不同尺寸、不同初始速率、不同喷射角的球形液滴的动力参数和传热特性参数进行数值计算。计算结果表明,雾化液滴在饱和蒸汽相中的滞空时间取决于喷雾头与气液分界面之间的垂直距离;雾化液滴与饱和蒸汽之间的传热绝大部分在很短的时间内完成;雾化特性中喷射角和初始速率对液滴单位质量的换热量影响很小,液滴单位质量换热量由液滴初始尺寸决定。Abstract: This paper established the dynamic model of the single droplet and the model of unsteady heat transfer between the droplet and steam,and compiled the computer program according to the characteristics formulation by Fortran language.And the dynamic and heat transfer parameters of single droplet are calculated according to various initial velocities,dimensions and injection angles.Calculation results indicate that the hang time of the droplet is determined by the vertical distance between the spray head and the steam-liquid interface.The most heat is accomplished shortly after the droplet leaving the spray head.The initial velocity and the injection angle hardly affect the droplet-steam heat transfer quantity,and heat transfer quantity between the droplet and steam is decided by the droplet dimension.
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