Background-Oriented Schlieren (BOS) for Scramjet Inlet-isolator Investigation

International Conference on Aerospace and Mechanical Engineering 2017

航空航天工程;机械制造

Idris, Azam Che^1 ; Saad, Mohd Rashdan^1 ; Lo, Kin Hing^2 ; Kontis, Konstantinos^2

Faculty of Engineering, National Defence University of Malaysia, Kem Sungai Besi, Kuala Lumpur

57000, Malaysia^1

School of Engineering, University of Glasgow, James Watt South Building, Glasgow

G12 8QQ, United Kingdom^2

关键词: Background oriented schlieren;    Data processing algorithms;    Direct cross correlations;    Exploratory studies;    Flow diagnostics;    Flow field characteristics;    Measurement sensitivity;    Quantitative data;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/370/1/012003/pdf
DOI  :  10.1088/1757-899X/370/1/012003

学科分类：航空航天科学

来源: IOP

【 摘 要 】

Background-oriented Schlieren (BOS) technique is a recently invented non-intrusive flow diagnostic method which has yet to be fully explored in its capabilities. In this paper, BOS technique has been applied for investigating the general flow field characteristics inside a generic scramjet inlet-isolator with Mach 5 flow. The difficulty in finding the delicate balance between measurement sensitivity and measurement area image focusing has been demonstrated. The differences between direct cross-correlation (DCC) and Fast Fourier Transform (FFT) raw data processing algorithm have also been demonstrated. As an exploratory study of BOS capability, this paper found that BOS is simple yet robust enough to be used to visualize complex flow in a scramjet inlet in hypersonic flow. However, in this case its quantitative data can be strongly affected by 3-dimensionality thus obscuring the density value with significant errors.