摘要
背景纹影(BOS)是一种基于光线折射的非接触式流场测量技术,可以定量获得流场的密度信息。与层析技术结合的背景纹影层析技术(BOST)能够实现三维密度场重建。本文针对轴对称喷管,采用BOS方法测量获得了超声速喷流的二维密度分布,在轴对称假设下采用BOST方法重构了其三维密度场并与二维结果进行对比。研究表明,二维BOS将视线积分的流场信息进行平均,忽略了沿光路方向流场结构变化所带来的影响,BOST模型中包含多个角度的投影信息,更准确地重建了喷流的三维结构和高空间分辨率的密度场。
Background-oriented schlieren(BOS)is a non-contact flow field measurement technique based on light refraction,which can quantitatively obtain density information of the flow field.The background-oriented schlieren tomography(BOST)technology combined with tomography can reconstruct the three-dimensional density field.This study focuses on the axisymmetric nozzle and uses the BOS method to measure the two-dimensional density field of the supersonic jet.Under the assumption of axisymmetric,the BOST method is used to reconstruct the three-dimensional density field and compare it with the two-dimensional results.Research has shown that two-dimensional BOS averages the flow field information integrated by the line of sight,ignoring the impact of changes in flow field structure along the optical path direction.The BOST model contains projection information from multiple angles,which more accurately reconstructs the three-dimensional structure of the jet and the high spatial resolution density field.
作者
魏祥智
史经纬
周莉
王占学
Xiang-zhi Wei;Jing-wei Shi;Li Zhou;Zhan-xue Wang(School of Power and Energy,Northwestern Polytechnical University;Collaborative Innovation Center for Advanced Aero-Engine)
出处
《风机技术》
2024年第5期59-62,共4页
Chinese Journal of Turbomachinery
基金
航空发动机及燃气轮机基础科学中心项目(P2022-B-Ⅱ-010-001)。
关键词
背景纹影
背景纹影层析
轴对称喷流
定量测量
密度场
三维重建
Background-oriented Schlieren
Background-oriented Schlieren Tomography
Axisymmetric Jet
Quantitative Mea-surement
Density Field
Three-dimensional Reconstruction
作者简介
通讯作者:史经纬,shijw@nwpu.edu.cn。
