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首页> 外文期刊>Thermal engineering >Numerically Simulating the Formation and Motion of Water Films and Erosion-Hazardous Droplets in Flow-Through Parts of Steam Turbines
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Numerically Simulating the Formation and Motion of Water Films and Erosion-Hazardous Droplets in Flow-Through Parts of Steam Turbines

机译：数值上模拟水膜和腐蚀 - 危险液滴在汽轮机流通件中的形成和运动

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Abstract A model for the process of coarse liquid particle formation in the flow-through parts of steam turbines is considered. A numerical approach is proposed to describe the formation and development of a water film on the surface of the interblade channels, and the main factors affecting the distribution of the film parameters along the curvilinear walls of the blades are presented. It is assumed that the only source of the water film is represented by liquid-phase particles deposited on the blade surfaces. The process of film detachment from the exit edge of the blade together with its subsequent destruction and the formation of large erosion-hazardous droplets is considered. The developed model has been integrated into the earlier proposed numerical approach to the description of the motion of liquid-phase particles and their interaction with solid surfaces. At the same time, an amendment has been introduced therein taking into account the presence of a water film when a liquid phase particle collides with a solid wall. The developed numerical method makes it possible to describe all the main gas-dynamic processes occurring in the course of motion for erosion-hazardous droplets in the interblade channels. This method has been tested using experimental studies on streaming wet-steam flow in a flat nozzle grating at different initial humidity of the working medium. Using the laser flux diagnostics system, velocities and sizes inherent in droplets beyond the grating along its spacing have been determined. The developed model provides a good agreement of these parameters with the experimental data in the places of the maximum concentration of coarse droplets. However, there is a significant discrepancy for some areas of the flow in the obtained results concerning the velocity distribution. The effect that the initial steam moisture exert on the characteristics of the water film on the blade surface is considered. It is established that the film thickness significantly affects the interaction between the droplets and the blade surface in the areas wherein the collision energy is small. These areas are characterized by a large angle between the velocity vector of the projectile droplet and that normal to the surface at the collision site.
机译：摘要考虑了蒸汽轮机流通件中粗液体颗粒形成方法的模型。提出了一种数值方法来描述互通通道表面上的水膜的形成和开发，并且呈现了影响叶片的曲线壁的薄膜参数分布的主要因素。假设水膜的唯一来源由沉积在刀片表面上的液相颗粒表示。考虑了从叶片的出口边缘的薄膜脱离的过程及其随后的破坏和形成大的侵蚀 - 危险液滴。开发的模型已被整合到较早的提出的数值方法中，以描述液相颗粒的运动及其与固体表面的相互作用的描述。同时，在其中引入了修正案，考虑到液相颗粒与固体壁碰撞时的水膜存在。开发的数值方法使得可以描述在互换通道中的侵蚀危险液滴的运动过程中发生的所有主要气体动力学过程。已经使用关于在工作介质的不同初始湿度下的平坦喷嘴光栅中流湿蒸汽流动的实验研究来测试该方法。使用激光磁通诊断系统，已经确定了沿着其间距的光栅超出液滴固有的速度和尺寸。开发的模型在最大粗液液体浓度的位置提供了这些参数的良好一致性。然而，对于具有速度分布的所获得的结果中的一些区域，存在显着的差异。考虑了初始蒸汽水分对叶片表面上的水膜特性的影响。建立膜厚度显着影响液滴和叶片表面之间的相互作用，其中碰撞能量很小。这些区域的特征在于射弹液滴的速度向量之间的大角度，并且碰撞部位的表面正常。

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