Measurement of the second-mode's propagation velocity in the hypersonic boundary layers of a flared cone with dual-frame focusing schlieren and optical flow velocimetry
Xiaolong Wang , Bo Zhou , Zhixin Zhao , Puyuan Wu , Cunbiao Lee
{"title":"Measurement of the second-mode's propagation velocity in the hypersonic boundary layers of a flared cone with dual-frame focusing schlieren and optical flow velocimetry","authors":"Xiaolong Wang , Bo Zhou , Zhixin Zhao , Puyuan Wu , Cunbiao Lee","doi":"10.1016/j.ast.2025.110216","DOIUrl":null,"url":null,"abstract":"<div><div>Understanding the transition mechanism in the hypersonic boundary layer is essential for hypersonic vehicles, where the second-mode wave plays a key role in the process. An experiment utilizing dual-frame focusing schlieren and optical flow velocimetry is performed in the Mach 6 wind tunnel at Peking University. Detailed two-dimensional velocity field, frequency, and density fluctuation intensity of the second-mode waves in the near-wall region are analyzed and discussed. The experiment observes the density gradient's velocity fluctuating in the horizontal direction within the sonic line, while its mean velocity remains uniform. The measurement of the second-mode frequency meets the results by PCB® and FLDI but with a much lower sampling frequency.</div></div>","PeriodicalId":50955,"journal":{"name":"Aerospace Science and Technology","volume":"162 ","pages":"Article 110216"},"PeriodicalIF":5.8000,"publicationDate":"2025-07-01","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/S1270963825002871","RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"2025/4/15 0:00:00","PubModel":"Epub","JCR":"Q1","JCRName":"ENGINEERING, AEROSPACE","Score":null,"Total":0}
引用次数: 0
Abstract
Understanding the transition mechanism in the hypersonic boundary layer is essential for hypersonic vehicles, where the second-mode wave plays a key role in the process. An experiment utilizing dual-frame focusing schlieren and optical flow velocimetry is performed in the Mach 6 wind tunnel at Peking University. Detailed two-dimensional velocity field, frequency, and density fluctuation intensity of the second-mode waves in the near-wall region are analyzed and discussed. The experiment observes the density gradient's velocity fluctuating in the horizontal direction within the sonic line, while its mean velocity remains uniform. The measurement of the second-mode frequency meets the results by PCB® and FLDI but with a much lower sampling frequency.
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:
• The design and the manufacture of aircraft, helicopters, missiles, launchers and satellites
• The control of their environment
• The study of various systems they are involved in, as supports or as targets.
Authors are invited to submit papers on new advances in the following topics to aerospace applications:
• Fluid dynamics
• Energetics and propulsion
• Materials and structures
• Flight mechanics
• Navigation, guidance and control
• Acoustics
• Optics
• Electromagnetism and radar
• Signal and image processing
• Information processing
• Data fusion
• Decision aid
• Human behaviour
• Robotics and intelligent systems
• Complex system engineering.
Etc.
京公网安备 11010802042870号
京ICP备2023020795号-1
分享
求助内容：
应助结果提醒方式：
扫码关注我们
