Visualization of wave propagation within a supersonic two-dimensional cavity by digital streak schlieren

Sridhar, V.; Kleine, H.; Gai, S. L.

doi:10.1007/s00348-015-2026-3

Cited by 12 publications

(3 citation statements)

References 25 publications

(42 reference statements)

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“…CFD is increasingly turning to schlieren and shadowgraphy as a paradigm of visual presentation in the post-processing of numerical flow simulation data. The idea effectively began with Yates 24 years ago [111,112], and has gathered momentum ever since [77,[113][114][115][116][117]. Currently, many authors barely mention why their results are displayed as derivative fields.…”

Section: Displaying Cfd Results As Computer-simulated Schlieren Image...mentioning

confidence: 99%

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A review of recent developments in schlieren and shadowgraph techniques

Settles¹,

Hargather

2017

Meas. Sci. Technol.

312

154

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Schlieren and shadowgraph techniques are used around the world for imaging and measuring phenomena in transparent media. These optical methods originated long ago in parallel with telescopes and microscopes, and although it might seem that little new could be expected of them on the timescale of 15 years, in fact several important things have happened that are reviewed here. The digital revolution has had a transformative effect, replacing clumsy photographic film methods with excellent-though expensive-high-speed video cameras, making digital correlation and processing of shadow and schlieren images routine, and providing an entirely-new synthetic schlieren technique that has attracted a lot of attention: background-oriented schlieren or BOS. Several aspects of modern schlieren and shadowgraphy depend upon laptop-scale computer processing of images using an imagecapable language such as MATLAB ™. BOS, shock-wave tracking, schlieren velocimetry, synthetic streak-schlieren, and straightforward quantitative density measurements in 2D flows are all recent developments empowered by this digital and computational capability.

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Section: Displaying Cfd Results As Computer-simulated Schlieren Image...mentioning

confidence: 99%

“…Today, streak schlieren analysis continues to be used in explosives research [71,72], and has expanded to measurements of the impact shock-Hugoniot response of polymers [73,74], oscillating supersonic cavity flows [75][76][77], and fire research [50].…”

Section: Digital Streak Schlieren and Shadowgraph Imagingmentioning

confidence: 99%

A review of recent developments in schlieren and shadowgraph techniques

Settles¹,

Hargather

2017

Meas. Sci. Technol.

312

154

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“…background pattern of the form of a randomly generated dot-pattern to replace the troublesome cutoff grid, greatly simplifying the optical system (Meier, 2002). Digital streak schlieren and shadowgraph imaging is another technique that is often used in the studies of 1D unsteady phenomena, such as explosions (Sridhar et al, 2015). Additionally, computer simulations of schlieren and shadowgraph optics and images are often used to display and validate CFD results (Shenoy et al, 1998).…”

Section: Shadowgraph Schlieren Techniques and Backlit Imagingmentioning

confidence: 99%

Quantitative analysis of a canonical coaxial two-fluid spray based on X-ray imaging techniques

Li¹

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CHAPTER 4. CALIBRATION AND STATISTICAL ANALYSIS OF TIME-SERIES MEASUREMENTSChapter 4 summarizes the calibration and statistical methods used to access the X-ray images. Section 4.1 outlines the calibrations used to correct for beam hardening and penumbra effects that are common in tube source X-rays. Due to the beam hardening effects, it will be shown that the attenuation coefficient for the broadband X-ray is a complex function related to energy level and wavelength, which is difficult to determine. Section 4.2 provides a general attenuation coefficient estimated from a liquid stream that may be used in white beam imaging.The estimated attenuation coefficient matches the theoretical attenuation coefficient of water.Section 4.3 shows the influence of sampling method on the image data sets. The influence of sampling period and sampling frequency of the spray are discussed. 4.1 Calibration of Beam Hardening Effect and Penumbra Effect * Section 4.1 is a conference paper submitted for 14th Triennial International Conference on Liquid Atomization and Spray Systems (ICLASS 2018).

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