Modifications of balancing slots in drum rotor arrangement of steam turbine stages and their influence on efficiency

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21220%2F25%3A00390616" target="_blank" >RIV/68407700:21220/25:00390616 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.1115/GT2025-151556" target="_blank" >https://doi.org/10.1115/GT2025-151556</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1115/GT2025-151556" target="_blank" >10.1115/GT2025-151556</a>

Result language

angličtina

Original language name

Modifications of balancing slots in drum rotor arrangement of steam turbine stages and their influence on efficiency

Original language description

An analysis of the industrial steam turbine market shows that many customers require steam turbines with relatively small output and high inlet steam pressures and temperatures, causing small nominal mass flows of steam through the turbine flow parts. As a result, the blades of the first stages tend to be relatively short, which is connected with the high energy losses. This problem can be partially alleviated when the drum rotor arrangement is used. In order to increase efficiency further, the balancing slots, which are created on the rotor blades, can be used. These slots can be of different shapes, dimensions, and positions. Doosan Skoda Power has investigated this issue using measurements on an experimental turbine as well as numerical simulations. Some results of this study have already been presented. However, many details regarding the influence on efficiency have not been presented yet. This paper presents several possible balancing slots shape modifications. These modifications influence both the mass flow through the balancing slots and the torque of these slots. It can lead to an efficiency drop or an increase. A numerical model based on the experimental turbine was created to simulate several balancing slot designs. It represents the turbine flow-through part with two drum stages, including adjacent seals and investigated balancing slots. The numerical simulations were carried out using an Ansys software tools package. The computed flow fields and important integral results are shown. The influence of each design change is discussed. The resulting rules for designing the balancing slots are presented.

Czech name

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Czech description

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Type

D - Article in proceedings

CEP classification

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OECD FORD branch

20303 - Thermodynamics

Project

—

Continuities

N - Vyzkumna aktivita podporovana z neverejnych zdroju

Publication year

2025

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection

Proceedings of ASME Turbo Expo 2025: Turbomachinery Technical Conference and Exposition

ISBN

978-0-7918-8883-4

ISSN

—

e-ISSN

—

Number of pages

12

Pages from-to

1-12

Publisher name

The American Society of Mechanical Engineers

Place of publication

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Event location

Memphis, Tennessee, USA

Event date

Jun 16, 2025

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

001562003400047