汽轮机中湿汽损失的定量计算

李瑜 1; 宁德亮 2; 李亮 1; 李军 1

doi:10.7652/xjtuxb201401005

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汽轮机中湿汽损失的定量计算

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- 汽轮机中湿汽损失的定量计算
- Quantitative Evaluation of Wetness Losses in Steam Turbine
- 西安交通大学学报 2014年48卷第1期页码：25-30
- 作者机构：
  
  西安交通大学叶轮机械研究所,西安,710049
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb201401005
  中图分类号： TK262
- 网络首发：2014-01-10，
  
  纸质出版：2014
- 稿件说明：
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李瑜 1, 宁德亮 2, 李亮 1, 等. 汽轮机中湿汽损失的定量计算[J]. 西安交通大学学报, 2014,48(1):25-30.

Quantitative Evaluation of Wetness Losses in Steam Turbine[J]. 2014, 48(1): 25-30.
李瑜 1, 宁德亮 2, 李亮 1, 等. 汽轮机中湿汽损失的定量计算[J]. 西安交通大学学报, 2014,48(1):25-30. DOI： 10.7652/xjtuxb201401005.

Quantitative Evaluation of Wetness Losses in Steam Turbine[J]. 2014, 48(1): 25-30. DOI： 10.7652/xjtuxb201401005.

摘要

为了提高湿汽损失的计算精度

在湿蒸汽非平衡凝结流动计算结果的基础上

采用Fortran语言发展了湿汽损失的定量计算程序

即利用多级透平内湿蒸汽非平衡凝结流动的三维计算方法获得各透平级的气动参数和一次水滴的三维分布

再对三维计算结果进行周向平均

从而获得了圆柱坐标系下子午面内的流场参数

并以此为基础进行湿汽损失的定量计算。对某核电汽轮机低压缸中的湿汽损失进行了分析

结果表明:湿汽损失中热力学损失主要产生于发生非平衡凝结的中间级和末级; 水滴阻力损失在末级中较大

其余各级中较小; 制动损失沿着流动方向逐级增加

是湿汽损失最主要的组成部分; 疏水损失及离心损失在湿汽损失中所占比例较小; 总的湿汽损失占该核电汽轮机低压缸总功率的3.1%。与Baumann公式3.9%的计算结果相比

该定量计算得到的湿汽损失更小

定量计算方法可为核电汽轮机的设计和优化提供参考。

Abstract

In order to improve the evaluation accuracy of wetness losses

a quantitative evaluation program of wetness losses was developed using the Fortran language from the calculation results of wet steam flow with non-equilibrium condensation. A three-dimensional(3D)simulation of the wet steam flow with non-equilibrium condensation in a multi-stage turbine was performed to obtain the aerodynamic parameters and 3D distribution of the fine droplets. Then the 3D results were circumferentially averaged to obtain the flow field in the meridian plane

and the parameters of the flow field were used to quantitatively evaluate the wetness losses. The wetness losses in the low pressure(LP)cylinder of a nuclear steam turbine were calculated. The results show that the thermodynamic loss is mainly generated in the intermediate and last stages where the non-equilibrium condensation occurs. The droplet drag loss has a greater proportion in the last stage

and lower proportion in other stages. The brake loss is the most important component of the wetness losses

and it increases stage by stage. The collected water loss and the centrifugal loss have small proportions in the total losses. The total wetness losses in the LP cylinder under consideration account for 3.1% of the total output power of the LP cylinder

less than 3.9% predicted by the Baumann rule.

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