Effect of asymmetric diffuser deflector on even distribution of steam leaving blade section of steam turbine: comparative computational study

IF 6.4 2区工程技术 Q1 THERMODYNAMICS

Case Studies in Thermal Engineering Pub Date : 2025-06-09 DOI:10.1016/j.csite.2025.106490

Marek Bobčík , Jiří Pospíšil , Jan Fiedler

引用次数: 0

Abstract

This study presents a computational analysis comparing two designs of steam turbine diffuser deflectors: a conventional axisymmetric design and an innovative asymmetric design. The computational comparison is carried out for a real turbine with a power output of 1.090 MW. Utilizing ANSYS CFX simulations based on the finite volume method, the innovative deflector demonstrates extending the steam expansion, which is directly related to the up to 5 % increase in the output power of the turbine last stage blades. The asymmetric steam turbine diffuser deflector geometry promotes a more uniform static pressure distribution and reduces flow separation and recirculation zones, leading to decreased pressure losses between the turbine's inner and outer casings.

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非对称扩散导流板对汽轮机汽叶截面均匀分布影响的对比计算研究

本文对汽轮机扩散导流板的两种设计进行了计算分析，比较了传统轴对称设计和创新的非对称设计。以输出功率为1.090 MW的实际水轮机为例进行了计算比较。利用基于有限体积法的ANSYS CFX仿真，创新的偏转板扩展了蒸汽膨胀，这与涡轮末级叶片输出功率增加高达5%直接相关。不对称的汽轮机扩散导流板几何形状促进了更均匀的静压分布，减少了流动分离和再循环区域，从而降低了涡轮机内外壳之间的压力损失。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Case Studies in Thermal Engineering Chemical Engineering-Fluid Flow and Transfer Processes

CiteScore

8.60

自引率

11.80%

发文量

812

审稿时长

76 days

期刊介绍： Case Studies in Thermal Engineering provides a forum for the rapid publication of short, structured Case Studies in Thermal Engineering and related Short Communications. It provides an essential compendium of case studies for researchers and practitioners in the field of thermal engineering and others who are interested in aspects of thermal engineering cases that could affect other engineering processes. The journal not only publishes new and novel case studies, but also provides a forum for the publication of high quality descriptions of classic thermal engineering problems. The scope of the journal includes case studies of thermal engineering problems in components, devices and systems using existing experimental and numerical techniques in the areas of mechanical, aerospace, chemical, medical, thermal management for electronics, heat exchangers, regeneration, solar thermal energy, thermal storage, building energy conservation, and power generation. Case studies of thermal problems in other areas will also be considered.