轴向间距对二次水滴运动特性及沉积规律的影响

潘家成 1; 2; 徐亮 1; 高建民 1; 赵世全 2; 漆小兵 2; 王维 1

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轴向间距对二次水滴运动特性及沉积规律的影响

更新时间：2025-07-09

- 轴向间距对二次水滴运动特性及沉积规律的影响
- Influence of Axial Clearance on Movement Characteristic and Deposition of Secondary Droplets
- 西安交通大学学报 2012年46卷第7期页码：1-6+81
- 作者机构：
  
  1. 西安交通大学机械系统工程国家重点实验室,西安,710049
  2. 东方汽轮机有限公司,四川,德阳,618000
- 作者简介：
- 基金信息：
  
  : 2011-12-01. 作者简介: 潘家成(1962-),男,博士生,高级工程师;徐亮(通讯作者),男,博士,讲师. 基金项目: 国家自然科学基金资助项目(51106124);高等学校博士学科点科研基金资助项目(20100201120007)
- DOI：
  中图分类号： TK124
- 网络首发：2012-07-10，
  
  纸质出版：2012
- 稿件说明：
移动端阅览
潘家成 1, 2, 徐亮 1, 等. 轴向间距对二次水滴运动特性及沉积规律的影响[J]. 西安交通大学学报, 2012,46(7):1-6+81.

Influence of Axial Clearance on Movement Characteristic and Deposition of Secondary Droplets[J]. 2012, 46(7): 1-6+81.
潘家成 1, 2, 徐亮 1, 等. 轴向间距对二次水滴运动特性及沉积规律的影响[J]. 西安交通大学学报, 2012,46(7):1-6+81. DOI：

Influence of Axial Clearance on Movement Characteristic and Deposition of Secondary Droplets[J]. 2012, 46(7): 1-6+81. DOI：

摘要

基于有限体积法、计算流体力学研究了某核电大功率汽轮机次末级的二次水滴侵蚀问题

采用Lagrangian方法求解了水滴的离散输运方程

利用Eulerian方法求解了叶栅内蒸汽的流动

并为叶栅通道内的汽相流动与水滴运动建立了数学模型.在定常条件下

通过轴向间距对二次水滴运动特性及沉积规律的影响研究发现:脱离静叶尾缘的水滴在叶栅通道空间中均呈现出向上端壁倾斜的运动趋势

由此获得了叶栅通道中水滴在各固壁面的沉积率; 加大轴向间距可以减小二次水滴对动叶片的撞击速度

增大大颗粒水滴抛落到轴向间距上端壁的沉积率.所以

依据大颗粒水滴的集中沉积区域可以确定动叶表面去湿沟槽的适宜位置

该位置应位于吸力面上半部的前缘至中弦区域之间.

Abstract

Secondary droplet erosion in the penultimate stage of a nuclear power large steam turbine was investigated by CFD on the basis of the finite volume method. The discrete phase transport model of the water droplets was solved using the Lagrangian formulations

and the Eulerian conservation equations were applied to solve the steam flow in blade cascades. The mathematical model of steam flow and droplets movement in the cascade passage was established. The influence of axial clearance on the movement characteristic and deposition of secondary droplets was examined under the steady condition. The results show that the movement of all the water drops from the trailing edges of the stationary blade displays the tendency to slope up to the tip and then the deposition rates of water drops on all the walls in the blade passage can be obtained. The impact velocity of secondary drops on the moving blades decreases and the deposition rate of large droplets dropping onto the top of axial clearance increases if the axial clearance is greater. In addition

the suitable positions of the moisture-removal grooves should be distributed from the leading edge to 50% axial chord of the rotating blades according to the concentrated deposition areas of large droplets.

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