{"title":"在有背景横流的起始射流中形成前导涡环","authors":"","doi":"10.1016/j.ast.2024.109590","DOIUrl":null,"url":null,"abstract":"<div><p>The influence of background crossflow on the formation process of leading vortex ring in starting jet has been systematically investigated over the range of <span><math><mn>1</mn><mo>≤</mo><msub><mrow><mi>R</mi></mrow><mrow><mi>v</mi></mrow></msub><mo>≤</mo><mn>6</mn></math></span> and <span><math><mn>0.7</mn><mo>≤</mo><mi>L</mi><mo>/</mo><mi>D</mi><mo>≤</mo><mn>6</mn></math></span>, where <span><math><msub><mrow><mi>R</mi></mrow><mrow><mi>v</mi></mrow></msub></math></span> is the ratio of jet velocity to crossflow velocity and <span><math><mi>L</mi><mo>/</mo><mi>D</mi></math></span> is the ratio of jet column length to diameter. Particular attention is being paid to the unique interaction between the leading vortex ring and the trailing vortex structures. In general, the background crossflow disrupts the normal formation process of leading vortex ring by either stopping its growth prematurely (<span><math><msub><mrow><mi>R</mi></mrow><mrow><mi>v</mi></mrow></msub><mo>≥</mo><mn>2</mn></math></span>) or preventing it from formation entirely (<span><math><msub><mrow><mi>R</mi></mrow><mrow><mi>v</mi></mrow></msub><mo><</mo><mn>2</mn></math></span>). For <span><math><msub><mrow><mi>R</mi></mrow><mrow><mi>v</mi></mrow></msub><mo>≥</mo><mn>2</mn></math></span>, a new line, denoted as the optimal curve, is proposed with the formation number to illustrate the optimal application characteristics. The formation number diminishes with decreasing <span><math><msub><mrow><mi>R</mi></mrow><mrow><mi>v</mi></mrow></msub></math></span>. The mechanisms responsible for the clockwise (<span><math><mi>L</mi><mo>/</mo><mi>D</mi><mo>></mo><mi>L</mi><mo>/</mo><msub><mrow><mi>D</mi></mrow><mrow><mi>t</mi><mi>r</mi><mi>a</mi><mi>n</mi></mrow></msub></math></span>) and anticlockwise (<span><math><mi>L</mi><mo>/</mo><mi>D</mi><mo><</mo><mi>L</mi><mo>/</mo><msub><mrow><mi>D</mi></mrow><mrow><mi>t</mi><mi>r</mi><mi>a</mi><mi>n</mi></mrow></msub></math></span>) rotations of leading vortex ring have been further analyzed via kinematics and vortex dynamics. <span><math><mi>L</mi><mo>/</mo><msub><mrow><mi>D</mi></mrow><mrow><mi>t</mi><mi>r</mi><mi>a</mi><mi>n</mi></mrow></msub></math></span> represents the <span><math><mi>L</mi><mo>/</mo><mi>D</mi></math></span> corresponding to the transition of leading vortex ring from anticlockwise rotation to clockwise rotation. As for the inability to produce a complete leading vortex ring at <span><math><msub><mrow><mi>R</mi></mrow><mrow><mi>v</mi></mrow></msub><mo><</mo><mn>2</mn></math></span>, it is largely due to the fact that the crossflow weakens and directly inhibits the roll-up for the shear layer of starting jet on the windward side.</p></div>","PeriodicalId":50955,"journal":{"name":"Aerospace Science and Technology","volume":null,"pages":null},"PeriodicalIF":5.0000,"publicationDate":"2024-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Formation of leading vortex ring in the starting jet with background crossflow\",\"authors\":\"\",\"doi\":\"10.1016/j.ast.2024.109590\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>The influence of background crossflow on the formation process of leading vortex ring in starting jet has been systematically investigated over the range of <span><math><mn>1</mn><mo>≤</mo><msub><mrow><mi>R</mi></mrow><mrow><mi>v</mi></mrow></msub><mo>≤</mo><mn>6</mn></math></span> and <span><math><mn>0.7</mn><mo>≤</mo><mi>L</mi><mo>/</mo><mi>D</mi><mo>≤</mo><mn>6</mn></math></span>, where <span><math><msub><mrow><mi>R</mi></mrow><mrow><mi>v</mi></mrow></msub></math></span> is the ratio of jet velocity to crossflow velocity and <span><math><mi>L</mi><mo>/</mo><mi>D</mi></math></span> is the ratio of jet column length to diameter. Particular attention is being paid to the unique interaction between the leading vortex ring and the trailing vortex structures. In general, the background crossflow disrupts the normal formation process of leading vortex ring by either stopping its growth prematurely (<span><math><msub><mrow><mi>R</mi></mrow><mrow><mi>v</mi></mrow></msub><mo>≥</mo><mn>2</mn></math></span>) or preventing it from formation entirely (<span><math><msub><mrow><mi>R</mi></mrow><mrow><mi>v</mi></mrow></msub><mo><</mo><mn>2</mn></math></span>). For <span><math><msub><mrow><mi>R</mi></mrow><mrow><mi>v</mi></mrow></msub><mo>≥</mo><mn>2</mn></math></span>, a new line, denoted as the optimal curve, is proposed with the formation number to illustrate the optimal application characteristics. The formation number diminishes with decreasing <span><math><msub><mrow><mi>R</mi></mrow><mrow><mi>v</mi></mrow></msub></math></span>. The mechanisms responsible for the clockwise (<span><math><mi>L</mi><mo>/</mo><mi>D</mi><mo>></mo><mi>L</mi><mo>/</mo><msub><mrow><mi>D</mi></mrow><mrow><mi>t</mi><mi>r</mi><mi>a</mi><mi>n</mi></mrow></msub></math></span>) and anticlockwise (<span><math><mi>L</mi><mo>/</mo><mi>D</mi><mo><</mo><mi>L</mi><mo>/</mo><msub><mrow><mi>D</mi></mrow><mrow><mi>t</mi><mi>r</mi><mi>a</mi><mi>n</mi></mrow></msub></math></span>) rotations of leading vortex ring have been further analyzed via kinematics and vortex dynamics. <span><math><mi>L</mi><mo>/</mo><msub><mrow><mi>D</mi></mrow><mrow><mi>t</mi><mi>r</mi><mi>a</mi><mi>n</mi></mrow></msub></math></span> represents the <span><math><mi>L</mi><mo>/</mo><mi>D</mi></math></span> corresponding to the transition of leading vortex ring from anticlockwise rotation to clockwise rotation. As for the inability to produce a complete leading vortex ring at <span><math><msub><mrow><mi>R</mi></mrow><mrow><mi>v</mi></mrow></msub><mo><</mo><mn>2</mn></math></span>, it is largely due to the fact that the crossflow weakens and directly inhibits the roll-up for the shear layer of starting jet on the windward side.</p></div>\",\"PeriodicalId\":50955,\"journal\":{\"name\":\"Aerospace Science and Technology\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":5.0000,\"publicationDate\":\"2024-09-16\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Aerospace Science and Technology\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S1270963824007193\",\"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}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Aerospace Science and Technology","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S1270963824007193","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}
Formation of leading vortex ring in the starting jet with background crossflow
The influence of background crossflow on the formation process of leading vortex ring in starting jet has been systematically investigated over the range of and , where is the ratio of jet velocity to crossflow velocity and is the ratio of jet column length to diameter. Particular attention is being paid to the unique interaction between the leading vortex ring and the trailing vortex structures. In general, the background crossflow disrupts the normal formation process of leading vortex ring by either stopping its growth prematurely () or preventing it from formation entirely (). For , a new line, denoted as the optimal curve, is proposed with the formation number to illustrate the optimal application characteristics. The formation number diminishes with decreasing . The mechanisms responsible for the clockwise () and anticlockwise () rotations of leading vortex ring have been further analyzed via kinematics and vortex dynamics. represents the corresponding to the transition of leading vortex ring from anticlockwise rotation to clockwise rotation. As for the inability to produce a complete leading vortex ring at , it is largely due to the fact that the crossflow weakens and directly inhibits the roll-up for the shear layer of starting jet on the windward side.
期刊介绍:
Aerospace Science and Technology publishes articles of outstanding scientific quality. Each article is reviewed by two referees. The journal welcomes papers from a wide range of countries. This journal publishes original papers, review articles and short communications related to all fields of aerospace research, fundamental and applied, potential applications of which are clearly related to:
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