THERMAL SCIENCE

International Scientific Journal

Yan Ping

,

Xiaoyuan Wen

,

Xiaodan Hu

,

Shuo Chen

,

Qi Sun

,

Zhuhai Zhong

,

Pengfei Han

,

Cun Wang

,

Wei Jiang

INVESTIGATION OF ENHANCED HEAT TRANSFER IN HOLLOW BLADE BY DIAMOND-INSPIRED STRUCTURE FOR DEHUMIDIFICATION IN STEAM TURBINE

ABSTRACT
Wet steam erosion plays a pivotal role in influencing the efficient and safe operation of steam turbines. The dehumidification technique, which combines hollow blade heating and purging, exhibits significant performance in the low pressure, long-blade stages. However, the hollow structure has a pronounced impact on blade strength and often results in low heat transfer efficiency. In this study, we introduce a turbulence generator inspired by the diamond lattice bonding to modify the internal channel structure of hollow long blades. This diamond-inspired structure aims to enhance turbulence within the blades, thereby increasing surface area and heat transfer coefficients, ultimately reducing erosion caused by secondary water droplets on downstream blades. Our findings indicate that incorporating a diamond-inspired structure as a framework within the conventional slot cavity blades results in a notable temperature increase on the blade surfaces. Specifically, at 100% rated flow conditions, the average blade surface temperature rises from 352-357 K. The diamond-inspired structure enhances heat transfer without significantly compromising the blades’ power output. Furthermore, reducing the bond length from 30-20 mm leads to an additional temperature increase from 357- 359 K. This suggests that a denser diamond lattice structure is more favorable for heating the stator blades.
KEYWORDS
heat transfer, dehumidification, steam turbine, Diamond-inspired Structure
PAPER SUBMITTED: 2024-08-12
PAPER REVISED: 2024-11-05
PAPER ACCEPTED: 2024-11-06
PUBLISHED ONLINE: 2024-12-07
DOI REFERENCE: https://doi.org/10.2298/TSCI240812265P
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2025, VOLUME 29, ISSUE Issue 3, PAGES [2491 - 2506]
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Investigation of enhanced heat transfer in hollow blade by diamond-inspired structure for dehumidification in steam turbine

2025 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence