Investigation of rail inclination effects on the aerothermal performance of turbine blade squealer tips with crown holes

IF 4.9 2区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Thermal Sciences Pub Date : 2025-03-04 DOI:10.1016/j.ijthermalsci.2025.109808

Haimeng Zhou , Lei Luo , Fei Zeng , Han Yan , Wei Du , Songtao Wang

{"title":"Investigation of rail inclination effects on the aerothermal performance of turbine blade squealer tips with crown holes","authors":"Haimeng Zhou , Lei Luo , Fei Zeng , Han Yan , Wei Du , Songtao Wang","doi":"10.1016/j.ijthermalsci.2025.109808","DOIUrl":null,"url":null,"abstract":"<div><div>The purpose of the rail crown-holed blade squealer tip in heavy-duty gas turbine is to improve tip cooling and decrease gap leakage. By effectively interacting with the gap flow, the cooling air from the rail crown holes considerably lowers the leakage flow rate (LFR). Furthermore, this cooling system guarantees complete thermal protection for the cavity floor (CF) and rail crown surface (RCS). To evaluate the possible improvements of the squealer tip with rail crown holes, the pressure-side rail is inclined in this study. Heat transfer, cooling efficiency, and aerodynamic performance are assessed for two squealer tip designs (conventional and novel) and five inclined distances (−3.0 mm, −1.5 mm, 0 mm, 1.5 mm, and 3.0 mm). Results indicate that inclining the rail outward increases the coolant coverage on the CF in the novel tip, reducing heat transfer but lowering the cooling intensity. The novel configuration provides robust protection for the rail crown surface, and both inward and outward inclinations negatively impact rail cooling. In terms of aerodynamics, the LFR decreases linearly with greater inclination distances for both tip designs, and the rail crown holes are more effective in LFR control when the rail is inclined towards the inner side of the cavity.</div></div>","PeriodicalId":341,"journal":{"name":"International Journal of Thermal Sciences","volume":"213 ","pages":"Article 109808"},"PeriodicalIF":4.9000,"publicationDate":"2025-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"International Journal of Thermal Sciences","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S1290072925001310","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, MECHANICAL","Score":null,"Total":0}

引用次数: 0

Abstract

The purpose of the rail crown-holed blade squealer tip in heavy-duty gas turbine is to improve tip cooling and decrease gap leakage. By effectively interacting with the gap flow, the cooling air from the rail crown holes considerably lowers the leakage flow rate (LFR). Furthermore, this cooling system guarantees complete thermal protection for the cavity floor (CF) and rail crown surface (RCS). To evaluate the possible improvements of the squealer tip with rail crown holes, the pressure-side rail is inclined in this study. Heat transfer, cooling efficiency, and aerodynamic performance are assessed for two squealer tip designs (conventional and novel) and five inclined distances (−3.0 mm, −1.5 mm, 0 mm, 1.5 mm, and 3.0 mm). Results indicate that inclining the rail outward increases the coolant coverage on the CF in the novel tip, reducing heat transfer but lowering the cooling intensity. The novel configuration provides robust protection for the rail crown surface, and both inward and outward inclinations negatively impact rail cooling. In terms of aerodynamics, the LFR decreases linearly with greater inclination distances for both tip designs, and the rail crown holes are more effective in LFR control when the rail is inclined towards the inner side of the cavity.

查看原文本刊更多论文

求助全文

约1分钟内获得全文求助全文

来源期刊

International Journal of Thermal Sciences 工程技术-工程：机械

CiteScore

8.10

自引率

11.10%

发文量

531

审稿时长

55 days

期刊介绍： The International Journal of Thermal Sciences is a journal devoted to the publication of fundamental studies on the physics of transfer processes in general, with an emphasis on thermal aspects and also applied research on various processes, energy systems and the environment. Articles are published in English and French, and are subject to peer review. The fundamental subjects considered within the scope of the journal are: * Heat and relevant mass transfer at all scales (nano, micro and macro) and in all types of material (heterogeneous, composites, biological,...) and fluid flow * Forced, natural or mixed convection in reactive or non-reactive media * Single or multi–phase fluid flow with or without phase change * Near–and far–field radiative heat transfer * Combined modes of heat transfer in complex systems (for example, plasmas, biological, geological,...) * Multiscale modelling The applied research topics include: * Heat exchangers, heat pipes, cooling processes * Transport phenomena taking place in industrial processes (chemical, food and agricultural, metallurgical, space and aeronautical, automobile industries) * Nano–and micro–technology for energy, space, biosystems and devices * Heat transport analysis in advanced systems * Impact of energy–related processes on environment, and emerging energy systems The study of thermophysical properties of materials and fluids, thermal measurement techniques, inverse methods, and the developments of experimental methods are within the scope of the International Journal of Thermal Sciences which also covers the modelling, and numerical methods applied to thermal transfer.