Effects of Transverse Distance and Cross Section Shape on Aerodynamic Performance of Tangential Admission Volute of Steam Turbine

doi:10.7652/xjtuxb202007012

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Effects of Transverse Distance and Cross Section Shape on Aerodynamic Performance of Tangential Admission Volute of Steam Turbine

更新时间：2025-07-09

- Effects of Transverse Distance and Cross Section Shape on Aerodynamic Performance of Tangential Admission Volute of Steam Turbine
- Vol. 54, Issue 7, Pages: 94-103+128(2020)
- 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/xjtuxb202007012
  CLC： TK269
- Online First：10 July 2020，
  
  Published：2020
- 稿件说明：
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Effects of Transverse Distance and Cross Section Shape on Aerodynamic Performance of Tangential Admission Volute of Steam Turbine[J]. 2020, 54(7): 94-103+128.
DOI：

Effects of Transverse Distance and Cross Section Shape on Aerodynamic Performance of Tangential Admission Volute of Steam Turbine[J]. 2020, 54(7): 94-103+128. DOI： 10.7652/xjtuxb202007012.

摘要

为了降低蜗壳总压损失并提高出口气流均匀性

对影响切向进汽蜗壳的气动特性和流场形态的因素进行了研究。采用数值方法求解了三维RANS方程和SST湍流模型

分析了横向间距和截面形状对汽轮机切向进气蜗壳气动性能的影响。数值模拟得到的部分切向进气蜗壳的质量流量和出口马赫数与实验测量数据一致

验证了数值方法的可靠性。对比分析了不同进口总压下5种切向进气蜗壳耦合静叶结构的气动性能参数和流场型态

结果表明:5种进气蜗壳耦合静叶结构的出口气流角基本不随进气总压的增加而改变; 5种进气蜗壳耦合静叶结构的总压损失系数和质量流量会随着进气总压的增加而增加; 进气蜗壳出口气流角随着横向间距的增加而增加

圆特征截面进气蜗壳出口气流角大于类多边形特征截面进气蜗壳的; 随着横向间距的增加

5种进气蜗壳耦合静叶结构的蜗壳总压损失系数增加

静叶总压损失系数减小

进气蜗壳耦合静叶结构的总压损失系数先减小后增加; 进气蜗壳截面形状对总压损失系数的影响明显大于横向间距的

类多边形特征截面蜗壳的总压损失系数明显大于圆特征截面蜗壳的; 静叶出口气流角几乎不受横向间距和特征截面的影响; 圆特征截面切向进气蜗壳耦合静叶结构具有最低的总压损失系数

圆特征截面完全切向进气蜗壳耦合静叶结构在蜗壳出口具有最佳的出口气流角周向分布均匀性。

Abstract

To reduce the total pressure loss of the tangential admission volute and improve the uniformity of outlet air flow

the factors affecting the aerodynamic characteristics and flow field of the tangential admission volute are investigated. The effects of transverse distance and cross section shape on the aerodynamic performance of the tangential admission volute of steam turbine are numerically evaluated with the three-dimensional RANS equations and SST turbulence model. The obtained numerical mass flow rate and outlet Mach number of the partial alignment tangential admission volute coincide well with the experimental data to verify the accuracy of the numerical approach. The flow fields and aerodynamic parameters of five kinds of tangential admission volutes coupled with stationary vanes are compared and discussed under different inlet total pressure conditions. The results show that the outlet flow angles of five kinds of tangential admission volutes with stationary vanes almost remain

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