Impact of the Inflow Conditions on the Heavy-Duty Gas Turbine Exhaust Diffuser Performance

被引：20

作者：

Vassiliev, Vladimir ^{[1
,4
]}

Irmisch, Stefan ^{[1
]}

Abdel-Wahab, Samer ^{[2
]}

Granovskiy, Andrey ^{[3
]}

机构：

[1] Alstom Switzerland Ltd, Testing & Validat, CH-5401 Baden, Switzerland

[2] Alstom Power, Jupiter, FL 33458 USA

[3] Alstom Power Uniturbo, Aerodynam Dept, Moscow 129626, Russia

[4] Alstom Switzerland Ltd, Alstom Power Expert, CH-5401 Baden, Switzerland

来源：

JOURNAL OF TURBOMACHINERY-TRANSACTIONS OF THE ASME | 2012年 / 134卷 / 04期

关键词：

Channel geometry - Diffuser performance - Exhaust loss - Field measurement - Heavy-duty gas turbines - Inflow conditions - Optimal conditions - Uniform inflow;

D O I：

10.1115/1.4003714

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

The flow in exhaust diffusers along with the channel geometry strongly depends on the inflow conditions, including Mach number level, total pressure distribution, flow angle, and turbulence. In the first part of this paper, the impact of these parameters is analyzed using computational fluid dynamics, experimental data from the test rig, and field measurements. A widespread opinion is that the optimal condition for the diffuser is an axial uniform inflow. However, it is shown in this paper that nonuniform pressure distribution compared with a uniform one can lead to better diffuser performance and that a moderate residual swirl can improve the performance as well. In the second part of this paper, the minimization of exhaust losses in heavy-duty gas turbines is discussed and illustrated by two practical examples. [DOI: 10.1115/1.4003714]

引用

页数：9