Kun Du , Xiangpeng Pei , Cunliang Liu , Bengt Sunden
{"title":"隔热涂层造成的孔洞堵塞对涡轮叶片端壁薄膜冷却性能的影响","authors":"Kun Du , Xiangpeng Pei , Cunliang Liu , Bengt Sunden","doi":"10.1016/j.ijthermalsci.2024.109491","DOIUrl":null,"url":null,"abstract":"<div><div>Thermal barrier coating (TBC) is extensively employed to protect hot components in modern gas turbines due to its high thermal resistance. Laser spraying is used to apply ceramic coating powder onto the target surface. However, when coating the junction region between the endwall and vane, the angle of the sprayer cannot face the surface directly. As a result, excessive spraying in a specific direction will result in hole blockages. Such blockages can disrupt cooling jet outflow, impacting downstream film cooling performance. This study investigated the adiabatic effectiveness of turbine nozzle guide vane endwalls, considering hole blockages. The experiments utilizing pressure sensitive paint (PSP) technique and simulations were both conducted, and the numerical turbulence model was validated. For a turbine cascade vane endwall, the blockage mainly occurred on the film holes near the boundary. These blockages significantly altered film flow direction, and increased the cooling jet momentum. For the endwall with cylindrical holes, the impact of blockages on the endwall cooling performance varied with blowing ratios. For the endwall with fan-shaped holes, blockages enhanced the cooling performance. In contrast, blockages reduced the cooling performance of endwall with converging slot holes.</div></div>","PeriodicalId":341,"journal":{"name":"International Journal of Thermal Sciences","volume":"208 ","pages":"Article 109491"},"PeriodicalIF":4.9000,"publicationDate":"2024-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Influence of hole blockage caused by thermal barrier coatings on the turbine vane endwall film cooling performance\",\"authors\":\"Kun Du , Xiangpeng Pei , Cunliang Liu , Bengt Sunden\",\"doi\":\"10.1016/j.ijthermalsci.2024.109491\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>Thermal barrier coating (TBC) is extensively employed to protect hot components in modern gas turbines due to its high thermal resistance. Laser spraying is used to apply ceramic coating powder onto the target surface. However, when coating the junction region between the endwall and vane, the angle of the sprayer cannot face the surface directly. As a result, excessive spraying in a specific direction will result in hole blockages. Such blockages can disrupt cooling jet outflow, impacting downstream film cooling performance. This study investigated the adiabatic effectiveness of turbine nozzle guide vane endwalls, considering hole blockages. The experiments utilizing pressure sensitive paint (PSP) technique and simulations were both conducted, and the numerical turbulence model was validated. For a turbine cascade vane endwall, the blockage mainly occurred on the film holes near the boundary. These blockages significantly altered film flow direction, and increased the cooling jet momentum. For the endwall with cylindrical holes, the impact of blockages on the endwall cooling performance varied with blowing ratios. For the endwall with fan-shaped holes, blockages enhanced the cooling performance. In contrast, blockages reduced the cooling performance of endwall with converging slot holes.</div></div>\",\"PeriodicalId\":341,\"journal\":{\"name\":\"International Journal of Thermal Sciences\",\"volume\":\"208 \",\"pages\":\"Article 109491\"},\"PeriodicalIF\":4.9000,\"publicationDate\":\"2024-10-21\",\"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/S1290072924006136\",\"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}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"International Journal of Thermal Sciences","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S1290072924006136","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}
Influence of hole blockage caused by thermal barrier coatings on the turbine vane endwall film cooling performance
Thermal barrier coating (TBC) is extensively employed to protect hot components in modern gas turbines due to its high thermal resistance. Laser spraying is used to apply ceramic coating powder onto the target surface. However, when coating the junction region between the endwall and vane, the angle of the sprayer cannot face the surface directly. As a result, excessive spraying in a specific direction will result in hole blockages. Such blockages can disrupt cooling jet outflow, impacting downstream film cooling performance. This study investigated the adiabatic effectiveness of turbine nozzle guide vane endwalls, considering hole blockages. The experiments utilizing pressure sensitive paint (PSP) technique and simulations were both conducted, and the numerical turbulence model was validated. For a turbine cascade vane endwall, the blockage mainly occurred on the film holes near the boundary. These blockages significantly altered film flow direction, and increased the cooling jet momentum. For the endwall with cylindrical holes, the impact of blockages on the endwall cooling performance varied with blowing ratios. For the endwall with fan-shaped holes, blockages enhanced the cooling performance. In contrast, blockages reduced the cooling performance of endwall with converging slot holes.
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.
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