Article(id=1320167405108703251, tenantId=1146029695717560320, journalId=1301849854269554754, issueId=1320124753134862378, articleNumber=null, orderNo=null, doi=10.11729/syltlx20240010, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1713369600000, receivedDateStr=2024-04-18, revisedDate=1715702400000, revisedDateStr=2024-05-15, acceptedDate=1717430400000, acceptedDateStr=2024-06-04, onlineDate=1792682036902, onlineDateStr=2026-10-22, pubDate=1771948800000, pubDateStr=2026-02-25, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1792682036902, onlineIssueDateStr=2026-10-22, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1792682036902, creator=13701087609, updateTime=1792682036902, updator=13701087609, issue=Issue{id=1320124753134862378, tenantId=1146029695717560320, journalId=1301849854269554754, year='2026', volume='40', issue='1', pageStart='1', pageEnd='160', issueExtLink='null', onlineDate='null', pubDate='1771948800000', pubDateStr='2026-02-25', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1792671867879, creator='13701087609', updateTime=1792671867879, updator='13701087609', preIssue=null, nextIssue=null, articleTotal=null, ext=null, issueFiles=null, downloadFileDto=null}, startPage=68, endPage=78, ext={EN=ArticleExt(id=1320167405310029844, articleId=1320167405108703251, tenantId=1146029695717560320, journalId=1301849854269554754, language=EN, title=Hypersonic boundary-layer instability measurement using multi-point focused laser differential interferometry, columnId=1301954871368904982, journalTitle=Journal of Experiments in Fluid Mechanics, columnName=Measuring Technique, runingTitle=null, highlight=null, articleAbstract=
Focused Laser Differential Interferometer (FLDI) has been widely used in the spatial measurement of hypersonic boundary layer instability. However, at present, the FLDI system used in China can only measure the density change of one or two spatial points at a time, and the experimental measurement along the streamwise direction or normal direction in the boundary layer cannot be carried out efficiently, and the correlation of the density fluctuation signal between the two measuring points obtained from two wind tunnel runs is poor. In this work, a setup of multi-point FLDI measurement system is designed and built, which can simultaneously obtain the second mode instability waves characteristics of multiple measuring points in the hypersonic boundary layer in a single wind tunnel operation period. Based on the Φ0.25 m low noise Mach 6 hypersonic Ludwieg tube wind tunnel in Huazhong University of Science and Technology (HUST), the instability waves measurement experiment of a sharp cone’s boundary layer with a freestream Reynolds number of 1.19 × 107 m−1 is carried out by using the multi-point FLDI measurement system. The experimental results show that the multi-point FLDI system successfully captures the typical second mode instability waves with the main frequency in the range of 316.4−322.3 kHz, which is agree with the main frequency 319.3 kHz of those measured by a PCB sensor at almost the same measuring point. Furthermore, through the cross-correlation analysis of the density fluctuation data obtained based on the multi-point FLDI system, it is found that the phase velocity of the instability waves between the adjacent measuring points is the same, which is consistent with the propagation velocity characteristics of the second mode instability waves in the boundary layer. The experimental results verify the data obtained by multi-point FLDI are quiet reliable. Above all, the multi-point FLDI system has the advantages of high efficiency, low cost, high accuracy and high spatial resolution, so it is expected to be applied to the basic research investigation in the future, such as hypersonic boundary layer instability and receptivity mechanism.
, authors=Xueliang LI, Yahan ZHANG, Chuang LÜ, Tao XUE, Jie WU
*, authorsList=Xueliang LI, Yahan ZHANG, Chuang LÜ, Tao XUE, Jie WU, authorCompany=null, correspAuthors=Jie WU, authorNote=null, correspAuthorsNote=null, copyrightStatement=Copyright ©2026 Journal of Experiments in Fluid Mechanics. All rights reserved., copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=null, magXml=null, pdfUrl=null, pdf=null, pdfFileSize=null, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=null, mapNumber=null, fund=null), CN=ArticleExt(id=1320167414415863878, articleId=1320167405108703251, tenantId=1146029695717560320, journalId=1301849854269554754, language=CN, title=多通道聚焦激光差分干涉法测量高超声速边界层不稳定性研究, columnId=1301954871549260056, journalTitle=实验流体力学, columnName=测量技术, runingTitle=null, highlight=null, articleAbstract=
聚焦激光差分干涉法(Focused Laser Differential Interferometry, FLDI)已经被广泛应用于高超声速边界层转捩研究的空间测量。但是,目前国内使用的FLDI系统每次只能测1或2个空间点的密度变化,不能高效率地进行边界层内沿流向或法向的实验测量,且不能对2次风洞实验测点之间的密度脉动信号进行有效的相关性分析。介于此,本文设计并搭建了一套多通道FLDI测量系统,可以在单次风洞运行周期内同时获得高超声速边界层内多个测点的不稳定波特征。基于华中科技大学Φ0.25 m马赫数6高超声速Ludwieg管低噪声风洞,在来流单位雷诺数为1.19 × 107 m−1工况下,将多通道FLDI测量系统应用于尖锥边界层不稳定性测量研究。实验结果显示,多通道FLDI系统成功测量到了高超声速边界层内主频在316.4~322.3 kHz的典型第二模态不稳定波,该频率范围与相同测点处PCB传感器测得的第二模态不稳定波主频(319.3 kHz)吻合较好。进一步对基于多通道FLDI系统获得的密度脉动数据进行互相关分析,发现相邻测点间求得的不稳定波相速度相同,具有尖锥标模边界层内第二模态不稳定波的速度传播特征,证明了多通道FLDI测量结果的可靠性。本文搭建的多通道FLDI系统具有效率高、准确性高、空间分辨率高和成本低等优点,适用于高超声速边界层不稳定性和感受性机制等问题的研究。
, authors=李学良, 张亚寒, 吕闯, 薛涛, 吴杰
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李学良(1997—),男,河南南阳人,博士研究生。研究方向:高超声速边界层转捩及高速流场测量。E-mail:xueliang_li@163.comxueliang_li@163.com
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李学良(1997—),男,河南南阳人,博士研究生。研究方向:高超声速边界层转捩及高速流场测量。E-mail:xueliang_li@163.comxueliang_li@163.com
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Sharp cone and PCB measuring position, figureFileSmall=MGne3U5c8a/pHesMro41ng==, figureFileBig=knEMxAz9X7MTwJLk7cuAsg==, tableContent=null), ArticleFig(id=1320167418895380594, tenantId=1146029695717560320, journalId=1301849854269554754, articleId=1320167405108703251, language=CN, label=图2, caption=
尖锥模型和传感器测点位置, figureFileSmall=MGne3U5c8a/pHesMro41ng==, figureFileBig=knEMxAz9X7MTwJLk7cuAsg==, tableContent=null), ArticleFig(id=1320167418958295155, tenantId=1146029695717560320, journalId=1301849854269554754, articleId=1320167405108703251, language=EN, label=Fig.3, caption=
Schematic diagram of single FLDI technique, figureFileSmall=DR4UhL6k6/6AGcMgKWO33A==, figureFileBig=NgiVsUcVYrrV9Hxi/B7zlg==, tableContent=null), ArticleFig(id=1320167419021209716, tenantId=1146029695717560320, journalId=1301849854269554754, articleId=1320167405108703251, language=CN, label=图3, caption=
单通道FLDI原理图, figureFileSmall=DR4UhL6k6/6AGcMgKWO33A==, figureFileBig=NgiVsUcVYrrV9Hxi/B7zlg==, tableContent=null), ArticleFig(id=1320167419084124277, tenantId=1146029695717560320, journalId=1301849854269554754, articleId=1320167405108703251, language=EN, label=Fig.4, caption=
Schematic diagram of multi-point FLDI technique, figureFileSmall=s6t74YFCYlfsh9ThjO34+g==, figureFileBig=aHzlUoPnnlXYVyarCjSgZg==, tableContent=null), ArticleFig(id=1320167419147038838, tenantId=1146029695717560320, journalId=1301849854269554754, articleId=1320167405108703251, language=CN, label=图4, caption=
多通道FLDI原理图, figureFileSmall=s6t74YFCYlfsh9ThjO34+g==, figureFileBig=aHzlUoPnnlXYVyarCjSgZg==, tableContent=null), ArticleFig(id=1320167419209953399, tenantId=1146029695717560320, journalId=1301849854269554754, articleId=1320167405108703251, language=EN, label=Fig.5, caption=
Emitting part of multi-point FLDI light path, figureFileSmall=qTxSqy3KXl03YI2CKooqTQ==, figureFileBig=2qtvx4hmrvu0AxlwosLrpw==, tableContent=null), ArticleFig(id=1320167419314811000, tenantId=1146029695717560320, journalId=1301849854269554754, articleId=1320167405108703251, language=CN, label=图5, caption=
多通道FLDI发射光路, figureFileSmall=qTxSqy3KXl03YI2CKooqTQ==, figureFileBig=2qtvx4hmrvu0AxlwosLrpw==, tableContent=null), ArticleFig(id=1320167419600023673, tenantId=1146029695717560320, journalId=1301849854269554754, articleId=1320167405108703251, language=EN, label=Fig.6, caption=
Receiving part of multi-point FLDI light path, figureFileSmall=OGYhiam8RaCrl4TgJHlXfg==, figureFileBig=TE0RnSn9WQpF450zi/KSKw==, tableContent=null), ArticleFig(id=1320167419960733818, tenantId=1146029695717560320, journalId=1301849854269554754, articleId=1320167405108703251, language=CN, label=图6, caption=
多通道FLDI接收光路, figureFileSmall=OGYhiam8RaCrl4TgJHlXfg==, figureFileBig=TE0RnSn9WQpF450zi/KSKw==, tableContent=null), ArticleFig(id=1320167420040425595, tenantId=1146029695717560320, journalId=1301849854269554754, articleId=1320167405108703251, language=EN, label=Fig.7, caption=
The focuses position of multi-point FLDI system, figureFileSmall=IX9w/eodxGZDBjFQ5/bVMA==, figureFileBig=WRKQQj3ckXuRLbp+0wX8SA==, tableContent=null), ArticleFig(id=1320167420107534460, tenantId=1146029695717560320, journalId=1301849854269554754, articleId=1320167405108703251, language=CN, label=图7, caption=
多通道FLDI系统测点区域示意图, figureFileSmall=IX9w/eodxGZDBjFQ5/bVMA==, figureFileBig=WRKQQj3ckXuRLbp+0wX8SA==, tableContent=null), ArticleFig(id=1320167420166254717, tenantId=1146029695717560320, journalId=1301849854269554754, articleId=1320167405108703251, language=EN, label=Fig.8, caption=
Six beam pairs at the focusing region of multi-point FLDI system, figureFileSmall=pouJPnMVGFd8Kp9X/OrrJw==, figureFileBig=iGxter2PKDetCtdPD57s6Q==, tableContent=null), ArticleFig(id=1320167420367581310, tenantId=1146029695717560320, journalId=1301849854269554754, articleId=1320167405108703251, language=CN, label=图8, caption=
多通道FLDI测量焦点, figureFileSmall=pouJPnMVGFd8Kp9X/OrrJw==, figureFileBig=iGxter2PKDetCtdPD57s6Q==, tableContent=null), ArticleFig(id=1320167420438884479, tenantId=1146029695717560320, journalId=1301849854269554754, articleId=1320167405108703251, language=EN, label=Fig.9, caption=
Receiving part setup of the single FLDI measurement, figureFileSmall=YQwipZi68ZqHJQB80T6Qcw==, figureFileBig=1/rRnYfzuh34GLrejGjCUQ==, tableContent=null), ArticleFig(id=1320167420505993344, tenantId=1146029695717560320, journalId=1301849854269554754, articleId=1320167405108703251, language=CN, label=图9, caption=
单通道FLDI接收光路测量装置, figureFileSmall=YQwipZi68ZqHJQB80T6Qcw==, figureFileBig=1/rRnYfzuh34GLrejGjCUQ==, tableContent=null), ArticleFig(id=1320167420573102209, tenantId=1146029695717560320, journalId=1301849854269554754, articleId=1320167405108703251, language=EN, label=Fig.10, caption=
Raw data of the single FLDI measurement, figureFileSmall=Ky6O4ZGJ4/1bkj4DKKjDVQ==, figureFileBig=+ivaMNaF2rB9uGGZSpjXtQ==, tableContent=null), ArticleFig(id=1320167420669571202, tenantId=1146029695717560320, journalId=1301849854269554754, articleId=1320167405108703251, language=CN, label=图10, caption=
单通道FLDI测量原始电压信号, figureFileSmall=Ky6O4ZGJ4/1bkj4DKKjDVQ==, figureFileBig=+ivaMNaF2rB9uGGZSpjXtQ==, tableContent=null), ArticleFig(id=1320167420736680067, tenantId=1146029695717560320, journalId=1301849854269554754, articleId=1320167405108703251, language=EN, label=Fig.11, caption=
PSD results of the single FLDI measurement, figureFileSmall=r+9T9F5nlqTN1hqMDAAdWQ==, figureFileBig=kUKILJvhXSsaFIxTNI2HRQ==, tableContent=null), ArticleFig(id=1320167420816371844, tenantId=1146029695717560320, journalId=1301849854269554754, articleId=1320167405108703251, language=CN, label=图11, caption=
单通道FLDI测量得到的功率谱密度结果, figureFileSmall=r+9T9F5nlqTN1hqMDAAdWQ==, figureFileBig=kUKILJvhXSsaFIxTNI2HRQ==, tableContent=null), ArticleFig(id=1320167420887675013, tenantId=1146029695717560320, journalId=1301849854269554754, articleId=1320167405108703251, language=EN, label=Fig.12, caption=
Raw data of the multi-point FLDI measurement, figureFileSmall=bMfZQQ1CG5xUiNJ0cZfkwA==, figureFileBig=e5SJzVEWc94AEV99A/u5QQ==, tableContent=null), ArticleFig(id=1320167422548619398, tenantId=1146029695717560320, journalId=1301849854269554754, articleId=1320167405108703251, language=CN, label=图12, caption=
多通道FLDI测量原始信号数据, figureFileSmall=bMfZQQ1CG5xUiNJ0cZfkwA==, figureFileBig=e5SJzVEWc94AEV99A/u5QQ==, tableContent=null), ArticleFig(id=1320167422615728263, tenantId=1146029695717560320, journalId=1301849854269554754, articleId=1320167405108703251, language=EN, label=Fig.13, caption=
PSD results of the multi-point FLDI measurement, figureFileSmall=1uKOVkNDRHT4e8VIYygGwQ==, figureFileBig=mItWt/yah3Re3q6F/TYqCw==, tableContent=null), ArticleFig(id=1320167422682837128, tenantId=1146029695717560320, journalId=1301849854269554754, articleId=1320167405108703251, language=CN, label=图13, caption=
多通道FLDI测量功率谱密度结果, figureFileSmall=1uKOVkNDRHT4e8VIYygGwQ==, figureFileBig=mItWt/yah3Re3q6F/TYqCw==, tableContent=null), ArticleFig(id=1320167422896746633, tenantId=1146029695717560320, journalId=1301849854269554754, articleId=1320167405108703251, language=EN, label=Fig.14, caption=
PSD results using the PCB sensor at L = 232.3 mm on the sharp cone surface, figureFileSmall=b6EGe36RLFm0isaL7/iC7g==, figureFileBig=jtEHWS+hoYoSFhWgz/FMCQ==, tableContent=null), ArticleFig(id=1320167422963855498, tenantId=1146029695717560320, journalId=1301849854269554754, articleId=1320167405108703251, language=CN, label=图14, caption=
尖锥表面测点N处PCB传感器测量结果, figureFileSmall=b6EGe36RLFm0isaL7/iC7g==, figureFileBig=jtEHWS+hoYoSFhWgz/FMCQ==, tableContent=null), ArticleFig(id=1320167423035158667, tenantId=1146029695717560320, journalId=1301849854269554754, articleId=1320167405108703251, language=EN, label=Fig.15, caption=
Cross-correlation coefficient curves of density fluctuation signals between adjacent multi-point FLDI measurement points, figureFileSmall=gvLbaqBIheybsdhsosy4NQ==, figureFileBig=6FpS/ZzNHtoeAVEWcz1PPQ==, tableContent=null), ArticleFig(id=1320167423098073228, tenantId=1146029695717560320, journalId=1301849854269554754, articleId=1320167405108703251, language=CN, label=图15, caption=
相邻多通道FLDI测点间密度脉动信号互相关系数曲线, figureFileSmall=gvLbaqBIheybsdhsosy4NQ==, figureFileBig=6FpS/ZzNHtoeAVEWcz1PPQ==, tableContent=null), ArticleFig(id=1320167423173570701, tenantId=1146029695717560320, journalId=1301849854269554754, articleId=1320167405108703251, language=EN, label=Fig.16, caption=
Spot status at receiving part of the multi-point FLDI, figureFileSmall=dJadiAVJIsvcOYUow+DoRg==, figureFileBig=xakMlJd6SX41gee+a7rM5A==, tableContent=null), ArticleFig(id=1320167423232290958, tenantId=1146029695717560320, journalId=1301849854269554754, articleId=1320167405108703251, language=CN, label=图16, caption=
多通道FLDI接收光路端光斑状态, figureFileSmall=dJadiAVJIsvcOYUow+DoRg==, figureFileBig=xakMlJd6SX41gee+a7rM5A==, tableContent=null), ArticleFig(id=1320167423295205519, tenantId=1146029695717560320, journalId=1301849854269554754, articleId=1320167405108703251, language=EN, label=Fig.17, caption=
Overfilled launch condition of a multimode fiber, figureFileSmall=W1ciDW93RzDK3NfaThDmcg==, figureFileBig=lVC+svCR5JS+PJItfntfLg==, tableContent=null), ArticleFig(id=1320167423374897296, tenantId=1146029695717560320, journalId=1301849854269554754, articleId=1320167405108703251, language=CN, label=图17, caption=
多模光纤过满条件, figureFileSmall=W1ciDW93RzDK3NfaThDmcg==, figureFileBig=lVC+svCR5JS+PJItfntfLg==, tableContent=null), ArticleFig(id=1320167423458783377, tenantId=1146029695717560320, journalId=1301849854269554754, articleId=1320167405108703251, language=EN, label=Fig.18, caption=
Attenuation of an optical fiber due to macrobend loss, figureFileSmall=+tRJ723TfyfChfDiISOBXg==, figureFileBig=rQlbSWC2exYB2Vn29dx9Og==, tableContent=null), ArticleFig(id=1320167423530086546, tenantId=1146029695717560320, journalId=1301849854269554754, articleId=1320167405108703251, language=CN, label=图18, caption=
光纤宏弯损耗造成的衰减, figureFileSmall=+tRJ723TfyfChfDiISOBXg==, figureFileBig=rQlbSWC2exYB2Vn29dx9Og==, tableContent=null)], attaches=null, journal=Journal(id=1301845723249213501, delFlag=0, nameCn=实验流体力学, nameEn=Journal of Experiments in Fluid Mechanics, nameHistory1=null, nameHistory2=null, issn=1672-9897, eissn=null, cn=11-5266/V, coden=null, periodic=1, language=CN, oaType=null, ccby=null, superviseOffice=null, ownerOffice=null, pubOffice=null, editorOffice=null, officeType=null, aims=null, clcCode=null, officeProv=null, officeCity=null, officeAddr=null, officeZip=null, officeEmail=null, officePhone=null, editDirector=null, officeDirector=null, officeDirectorPhone=null, officeStaffNum=null, officeEmpNum=null, coverPicUrl=IysuUGLKdKcj9RHlN5gAEg==, journalPrice=null, startedYear=null, abbrevIsoEn=Journal of Experiments in Fluid Mechanics, journalRemark=null, publicationField=null, createdTime=1788313807548, updatedTime=1788949682314, createdBy=18614031015, updatedBy=13041195026, 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