Experimental investigation of transient ignition dynamics of hydrogen enriched methane diffusion impinging flames

Wang, Q.; Mei, X.H.; Wei, Zhangning; Zhao, C.Y.; Zhang, Y.

doi:10.1016/j.fuel.2020.120027

Fuel

2021

DOI: 10.1016/j.fuel.2020.120027

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Experimental investigation of transient ignition dynamics of hydrogen enriched methane diffusion impinging flames

Q. Wang

X.H. Mei

Zhangning Wei

et al.

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Cited by 6 publications

References 28 publications

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Schlieren Image Velocimetry of Swirl Sprays

Machado¹,

Costa²,

Andrade³

et al. 2022

Flow Turbulence Combust

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Schlieren image velocimetry is based on light de ection through ow heterogeneities and image crosscorrelations. This is a low-cost and relatively low complexity technique that allows measurement of the droplet velocity eld in a large region of a spray. A Z-type Toepler schlieren system with a high-speed camera was used to determine mean vertical and horizontal droplet velocities, as well as the cone angles of sprays produced by a pressure swirl injector with characteristic geometric constant K = 2. Different LEDs and digital lters were evaluated for edge detection and improvement of image contrast. Open software was adopted for digital image processing and velocimetry. Interrogation windows and overlaps of different sizes were tested to obtain an appropriate correlation for determination of the velocity eld.The digital images were obtained with 5×10 3 fps and a resolution of 2.77 pixels/mm. Since the swirl sprays analysed presented instabilities, a number of 100 cross-correlations of images was required to reduce mean velocity uctuations. Injection pressures varied from 0.05 to 7 bar and mass ow rates varied from 1.389 to 13.89 g/s, using water as test uid. The wideband warm white LED with Laplacian or high-pass lters provided velocity data for a larger range of injection pressures. Mean axial velocities varied from 3.3 to 11.3 m/s, approximately, with mean horizontal velocities varying from around 0.17 to 3.3 m/s for pressures from 0.05 to 3.22 bar. The velocity data were compared to microscopic shadowgraphy results, showing a good agreement. Spray cone angles ranged from about 32.5 o to 69.5 o , for injection pressures from 0.05 to 7 bar, and results of triangulation with a blue LED were closer to semiempirical data.

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Schlieren Image Velocimetry of Swirl Sprays

Machado¹,

Costa²,

Andrade³

et al. 2022

Flow Turbulence Combust

View full text Add to dashboard Cite

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Laminar burning velocities and Markstein numbers for pure hydrogen and methane/hydrogen/air mixtures at elevated pressures

Alkhafaji

Jiang

Tomlin

et al. 2023

Fuel

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The premixed flame structure and combustion mechanism of clean hydrogen mixed with multi-component natural gas

Qi,

Li,

Zhou

et al. 2024

Fuel

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Experimental investigation of transient ignition dynamics of hydrogen enriched methane diffusion impinging flames

Cited by 6 publications

References 28 publications

Schlieren Image Velocimetry of Swirl Sprays

Schlieren Image Velocimetry of Swirl Sprays

Laminar burning velocities and Markstein numbers for pure hydrogen and methane/hydrogen/air mixtures at elevated pressures

The premixed flame structure and combustion mechanism of clean hydrogen mixed with multi-component natural gas

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