Enhanced cooling effectiveness of diffuser-type multi-column holes in a double-wall cooling structure

IF 6.4 2区工程技术 Q1 MECHANICS

International Communications in Heat and Mass Transfer Pub Date : 2025-07-12 DOI:10.1016/j.icheatmasstransfer.2025.109356

Deokhyeong Kim , Sajan Tamang , Heesung Park

{"title":"Enhanced cooling effectiveness of diffuser-type multi-column holes in a double-wall cooling structure","authors":"Deokhyeong Kim , Sajan Tamang , Heesung Park","doi":"10.1016/j.icheatmasstransfer.2025.109356","DOIUrl":null,"url":null,"abstract":"<div><div>Modern gas turbines increase efficiency by using fuels with a higher number of lower heat values to generate higher temperatures. However, a high temperature raises thermal stress and creep, reducing durability and increasing maintenance costs. Therefore, double-wall cooling technology is adopted in aerospace and power generation, particularly in combustor cooling and other components exposed to combusted gases. This investigation presents an experimental analysis of cooling performances by comparison between the conventional cylinder and diffuser-type holes. A double-wall cooling structure for combustor liners in high-temperature gas turbine applications has been considered. The injection angle of the effusion hole is fixed at 30°, and two distinct outlet hole shapes have been manufactured in the 711.2 × 300 mm<sup>2</sup> plate, including the impingement plate. The total pressure and temperature distribution were measured under different blowing ratios from 3 to 6. The flow characteristics and cooling performance through the designated cooling structure were evaluated using the two-dimensional contour representations under the different blowing ratios. The experimental results reveal that using a diffuser-type hole enhances cooling efficiency by 45.02 % ∼ 57.71 % compared to a cylindrical hole. This is due to the increased exit area, which reduces the jet lift-up from a diffuser-type hole and encourages lateral expansion.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"167 ","pages":"Article 109356"},"PeriodicalIF":6.4000,"publicationDate":"2025-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"International Communications in Heat and Mass Transfer","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0735193325007821","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MECHANICS","Score":null,"Total":0}

引用次数: 0

Abstract

Modern gas turbines increase efficiency by using fuels with a higher number of lower heat values to generate higher temperatures. However, a high temperature raises thermal stress and creep, reducing durability and increasing maintenance costs. Therefore, double-wall cooling technology is adopted in aerospace and power generation, particularly in combustor cooling and other components exposed to combusted gases. This investigation presents an experimental analysis of cooling performances by comparison between the conventional cylinder and diffuser-type holes. A double-wall cooling structure for combustor liners in high-temperature gas turbine applications has been considered. The injection angle of the effusion hole is fixed at 30°, and two distinct outlet hole shapes have been manufactured in the 711.2 × 300 mm² plate, including the impingement plate. The total pressure and temperature distribution were measured under different blowing ratios from 3 to 6. The flow characteristics and cooling performance through the designated cooling structure were evaluated using the two-dimensional contour representations under the different blowing ratios. The experimental results reveal that using a diffuser-type hole enhances cooling efficiency by 45.02 % ∼ 57.71 % compared to a cylindrical hole. This is due to the increased exit area, which reduces the jet lift-up from a diffuser-type hole and encourages lateral expansion.

查看原文本刊更多论文

双壁冷却结构中扩散型多柱孔冷却效果的提高

现代燃气轮机通过使用具有更多低热值的燃料来产生更高的温度来提高效率。然而，高温会增加热应力和蠕变，降低耐久性并增加维护成本。因此，在航空航天和发电中，特别是在燃烧室冷却和其他暴露于燃烧气体的部件中，采用双壁冷却技术。本文通过对传统圆柱型孔和扩散型孔的比较，对其冷却性能进行了实验分析。研究了高温燃气轮机燃烧室内衬的双壁冷却结构。在711.2 × 300 mm2板（包括撞击板）内，将渗出孔的注入角固定为30°，并制造出两种不同的出口孔形状。测量了3 ~ 6倍吹气比下的总压和温度分布。采用二维轮廓表示法对不同吹气比下指定冷却结构的流动特性和冷却性能进行了评价。实验结果表明，与圆柱孔相比，扩压孔的冷却效率提高了45.02% ~ 57.71%。这是由于出口面积的增加，减少了扩散器型井眼的射流升力，促进了横向膨胀。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

International Communications in Heat and Mass Transfer 工程技术-力学

CiteScore

11.00

自引率

10.00%

发文量

648

审稿时长

32 days

期刊介绍： International Communications in Heat and Mass Transfer serves as a world forum for the rapid dissemination of new ideas, new measurement techniques, preliminary findings of ongoing investigations, discussions, and criticisms in the field of heat and mass transfer. Two types of manuscript will be considered for publication: communications (short reports of new work or discussions of work which has already been published) and summaries (abstracts of reports, theses or manuscripts which are too long for publication in full). Together with its companion publication, International Journal of Heat and Mass Transfer, with which it shares the same Board of Editors, this journal is read by research workers and engineers throughout the world.