Study of shock-wave flows in the channel by schlieren and background oriented schlieren methods

Glazyrin, F. N.; Znamenskaya, I. A.; Mursenkova, I. V.; Sysoev, N. N.; Jin, Jiao

doi:10.3103/s8756699012030132

Cited by 8 publications

(5 citation statements)

References 5 publications

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“…Supersonic facilities such as shock tubes have also been used in order to visualize the shock-heated regions on a sharp cone at Mach 3.8 (Raghunath et al 2004) and shock waves at Mach 4 (Mizukaki 2010). Transonic flows and the shock waves contained have been examined by Glazyrin et al (2012) and Znamenskaya et al (2012). Wake flows behind wind tunnel models have been investigated in case of thermal, centrifugal and compressible effects.…”

Section: Bos Applications In Complex Facilitiesmentioning

confidence: 99%

Background-oriented schlieren (BOS) techniques

2015

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Section: Bos Applications In Complex Facilitiesmentioning

confidence: 99%

Background-oriented schlieren (BOS) techniques

2015

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“…where α is the angle of the direction of the ray with respect to the optical axis, and s o is the distance between the principal plane (the plane of lens and aperture) and the background. In practice, A ≈ 1 − 50 × 10 −3 m and s o ≈ 0.1 − 100 m. 7 For the paraxial approximation to be applicable within an accuracy of 1% (α < 15 • ≈ 0.25 rad), the relationship between r b and s o is…”

Section: Sensitivitymentioning

confidence: 99%

“…r t = r b + α s t is the distance of the deflecting point T from the optical axis, s t is the distance between the background and the test section (see figure 7 There are examples of using BOS technique for visualizing open air blast waves with so ≈ 400 m and st ≈ 100 m (Mizukaki et al 2012).…”

Section: Sensitivitymentioning

confidence: 99%

Measurement sensitivity and resolution for background oriented schlieren during image recording

Gojani

Kamishi

Obayashi

2013

J Vis

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Background oriented schlieren (BOS) visualization technique is examined by means of optical geometry. Two most important results are the calculation of the sensitivity and spatial resolution of a BOS system, which allows for the determination of the experiment design space. A set of relations that characterize the performance of a BOS measurement is given, with emphasis on the design of background pattern and spatial placement of optical components.

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“…The authors of [100] used BOS together with PIV for combined visualization of a flow with a Mach number M = 8 in a wind tunnel. BOS studies of unsteady transonic flows containing shock waves in the channel and at the exit from the shock tube channel were carried out at Lomonosov Moscow State University ( [101,102]. Figure 16 shows 3 BOS images of the shock wave exit and the flow from the shock tube end.…”

Section: Background Oriented Schlieren Methodsmentioning

confidence: 99%

“…The effect recorded at the shock fronts often does not correlate with the physical parameters of the flow. In papers [107], [101] it was shown that this problem is actually caused by the fact that the detected value of refraction goes beyond the sensitivity of the method. Due to the strong light refraction at the shock front, the deflected beam can go beyond the optical scheme and not be detected.…”

Section: Background Oriented Schlieren Methodsmentioning

confidence: 99%

Methods for Panoramic Visualization and Digital Analysis of Thermophysical Flow Fields. A Review.

Znamenskaya¹

2021

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The paper presents a review of modern methods in the registration, processing, and analysis of dynamic processes in liquids, gases, plasmas, multiphase media, which are realized in researches and technology. The review author observes both the physical fundamentals of flow visualization and the basics of modern technologies for digital processing of recorded flow images. A brief analysis of the panoramic visualization methods progress history covers a period of one and a half centuries. In the works of the last decade, the focus is on the methods of computer processing, tools, technologies for analyzing and recognizing of panoramic thermophysical fields, which make it possible to obtain quantitative information about flows. The review contains an analysis of publications describing the main modern methods of visualization of flows: methods based on the phenomenon of refraction; electroluminescence; on digital tracing (particle image velocimetry), visualization of surface flows (PSP and TSP coatings, liquid crystals; oil coatings). Particular attention is paid to methods using crosscorrelation image processing algorithms. Those are: digital tracing (PIV), shadow background method (in English Background Oriented Schlieren -BOS), seedless shadow methods, thermographic PIV, velocity measurement in viscous coatings, micro, tomographic modifications of PIV, etc. The actual problem of digital data analyzing in a panoramic experiment is touched upon -the problem of big data. Examples of the machine learning use in the analysis of big data sets of shadow surveys are given. Some examples of numerical simulation data visualization (simulation of experimental flowfields) are considered.

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Study of shock-wave flows in the channel by schlieren and background oriented schlieren methods

Cited by 8 publications

References 5 publications

Background-oriented schlieren (BOS) techniques

Background-oriented schlieren (BOS) techniques

Measurement sensitivity and resolution for background oriented schlieren during image recording

Methods for Panoramic Visualization and Digital Analysis of Thermophysical Flow Fields. A Review.

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