摘要
介绍了一种基于光纤传像的高速三维纹影密度场测量方法。该方法利用1台高速相机、2台氙灯、1套一分七光纤束以及一系列透镜,同时采集7个不同角度的纹影图像,结合层析重建,可以获取流场的三维密度场分布。该方法可以在43.37 mm×43.37 mm×43.37 mm的视场范围内,以2 kHz的帧速进行超声速微射流的三维密度场动态测量。实验结果显示了微型喷嘴出口下游的流动规律,多个反射激波在整个微射流中呈现多面体形状,而在冲击单元处的射流直径最小。冲击单元的长度随着喷嘴压力比的增加而增加,且在相同压力比下,第2个冲击单元的长度达到最大值。
The high-speed three-dimensional(3D)quantitative schlieren technology based on fiber bundles is introduced.This technology uses a high-speed camera,two xenon lamps,a set of one-to-seven optical fiber bundles and a series of lenses to simultaneously collect schlieren images from seven different angles.Combining with the tomographic reconstruction,the 3D density distribution of the flow field can be obtained.This technology performs 3D dynamic measurements of supersonic microjet within a field of view of 43.37 mm×43.37 mm×43.37 mm at a frame rate of 2 kHz.The experimental results show the flow pattern downstream of the micro-nozzle outlet.Multiple reflected shock waves present a polyhedral shape throughout the micro-jet,and the jet diameter is the smallest at the shock unit.The length of the shock unit increases with the increasing of nozzle pressure ratio under different nozzle pressure ratios,and at the same pressure ratio,the length of the second shock unit reaches the maximum value.
作者
谭思洋
李响
范玮
陈爽
周全
雷庆春
TAN Siyang;LI Xiang;FAN Wei;CHEN Shuang;ZHOU Quan;LEI Qingchun(School of Power and Energy,Northwestern Polytechnical University,Xi'an 710072,China;Facility Design and Instrumentation Institute,CARDC,Mianyang 621000,China)
出处
《西北工业大学学报》
北大核心
2025年第4期751-757,共7页
Journal of Northwestern Polytechnical University
基金
国家自然科学基金(52336006)
装备试验鉴定技术研究项目(2100070017)资助。
关键词
三维纹影
定量纹影
光纤成像
超声速射流
three-dimensional schlieren
quantitative schlieren
fiber optic imaging
supersonic jet
作者简介
谭思洋(2001-),硕士研究生;通信作者:雷庆春(1988-),副教授,e-mail:lqc@nwpu.edu.cn。
