Characteristics of penetration and distribution of a liquid jet in a divergent cavity-based combustor

IF 5.3 1区工程技术 Q1 ENGINEERING, AEROSPACE

Chinese Journal of Aeronautics Pub Date : 2023-12-01 DOI:10.1016/j.cja.2023.03.006

Yaozhi ZHOU , Zun CAI , Qinglian LI , Chenyang LI , Mingbo SUN , Shaotian GONG

{"title":"Characteristics of penetration and distribution of a liquid jet in a divergent cavity-based combustor","authors":"Yaozhi ZHOU , Zun CAI , Qinglian LI , Chenyang LI , Mingbo SUN , Shaotian GONG","doi":"10.1016/j.cja.2023.03.006","DOIUrl":null,"url":null,"abstract":"<div><p>The atomization process of a liquid jet in a divergent cavity-based combustor was investigated experimentally using high-speed photography and schlieren techniques under a Mach number 2.0 supersonic crossflow. Gas-liquid flow field was studied at different divergent angles and injection schemes. It is found that complex wave structures exist in the divergent cavity-based combustor. The spray field can be divided into three distinct zones: surface wave-dominated breakup zone, rapid atomization zone and cavity mixing zone. A dimensionless spray factor is defined to describe the concentration of spray inside the cavity qualitatively. As a result, it is revealed that for the large divergent angle cavity, the injection scheme near the upstream inlet has a higher penetration depth but a lower spray distribution, where the injection scheme near the cavity has a more spray distribution. For the small divergent angle cavity, the injection scheme near the upstream inlet also has a higher penetration depth and the injection scheme near the start point of the divergent section has a more sufficient spray distribution. The small divergent angle cavity-based combustor with the upstream wall transverse injection is an optimized injection scheme to improve both penetration and spray distribution inside the cavity. Finally, a penetration depth formula is proposed to explain the spray and distribution behaviors in the divergent cavity-based combustor.</p></div>","PeriodicalId":55631,"journal":{"name":"Chinese Journal of Aeronautics","volume":"36 12","pages":"Pages 139-150"},"PeriodicalIF":5.3000,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1000936123000626/pdfft?md5=7ef01c8b6f5b2c9b9fd9e0bac950f9c8&pid=1-s2.0-S1000936123000626-main.pdf","citationCount":"1","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Chinese Journal of Aeronautics","FirstCategoryId":"1087","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S1000936123000626","RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, AEROSPACE","Score":null,"Total":0}

引用次数: 1

Abstract

The atomization process of a liquid jet in a divergent cavity-based combustor was investigated experimentally using high-speed photography and schlieren techniques under a Mach number 2.0 supersonic crossflow. Gas-liquid flow field was studied at different divergent angles and injection schemes. It is found that complex wave structures exist in the divergent cavity-based combustor. The spray field can be divided into three distinct zones: surface wave-dominated breakup zone, rapid atomization zone and cavity mixing zone. A dimensionless spray factor is defined to describe the concentration of spray inside the cavity qualitatively. As a result, it is revealed that for the large divergent angle cavity, the injection scheme near the upstream inlet has a higher penetration depth but a lower spray distribution, where the injection scheme near the cavity has a more spray distribution. For the small divergent angle cavity, the injection scheme near the upstream inlet also has a higher penetration depth and the injection scheme near the start point of the divergent section has a more sufficient spray distribution. The small divergent angle cavity-based combustor with the upstream wall transverse injection is an optimized injection scheme to improve both penetration and spray distribution inside the cavity. Finally, a penetration depth formula is proposed to explain the spray and distribution behaviors in the divergent cavity-based combustor.

查看原文本刊更多论文

液体射流在发散腔燃烧室中的穿透和分布特性

在马赫数为 2.0 的超音速交叉流下，使用高速摄影和雪莲光技术对基于发散腔的燃烧器中液体射流的雾化过程进行了实验研究。研究了不同发散角和喷射方案下的气液流场。研究发现，发散型空腔燃烧器中存在复杂的波浪结构。喷雾场可分为三个不同的区域：表面波主导的破裂区、快速雾化区和空腔混合区。定义了一个无量纲喷雾系数，用于定性描述空腔内的喷雾浓度。结果表明，对于大发散角空腔，靠近上游入口的喷射方案穿透深度较大，但喷雾分布较少，而靠近空腔的喷射方案喷雾分布较多。对于小发散角空腔，靠近上游入口的喷射方案也具有较高的穿透深度，而靠近发散段起点的喷射方案具有更充分的喷雾分布。上游壁横向喷射的小发散角空腔式燃烧器是一种优化的喷射方案，既能提高穿透深度，又能改善空腔内的喷雾分布。最后，提出了一个穿透深度公式来解释发散型空腔燃烧器中的喷雾和分布行为。

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

Chinese Journal of Aeronautics 工程技术-工程：宇航

CiteScore

10.00

自引率

17.50%

发文量

3080

审稿时长

55 days

期刊介绍： Chinese Journal of Aeronautics (CJA) is an open access, peer-reviewed international journal covering all aspects of aerospace engineering. The Journal reports the scientific and technological achievements and frontiers in aeronautic engineering and astronautic engineering, in both theory and practice, such as theoretical research articles, experiment ones, research notes, comprehensive reviews, technological briefs and other reports on the latest developments and everything related to the fields of aeronautics and astronautics, as well as those ground equipment concerned.