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Simulation results for hydrogen flames in counter-current nozzles triggering the global instability phenomenon: effects of suction, shear layer thickness, and co-flow temperature

Version 1.0

Wawrzak, Agnieszka; Boguslawski, Andrzej; Tyliszczak, Artur, 2025, "Simulation results for hydrogen flames in counter-current nozzles triggering the global instability phenomenon: effects of suction, shear layer thickness, and co-flow temperature", https://doi.org/10.18150/GYQ3FK, RepOD, V1

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Description

Research data related to the publication "The role of suction, initial shear layer thickness, and co-flow temperature on hydrogen flame lift-off in counter-current nozzles".

This study employs Large Eddy Simulations (LES) to investigate nitrogen-diluted hydrogen flames in a counter-current configuration in which a fuel jet is surrounded by a co-axial nozzle sucking fluid. Outside the nozzle, a stream of oxidizer (air) is supplied. Control parameters include varying suction strength (𝐼=−𝑈𝑠𝑢𝑐/𝑈𝑗=0.0−0.25; 𝑈𝑠𝑢𝑐 - suction velocity, 𝑈𝑗 - jet velocity), three initial shear layer thicknesses (𝐷/𝜃=40,48 and 56; 𝐷 - nozzle diameter, 𝜃 - velocity profile momentum thickness), and two different co-flow temperatures (𝑇𝑐𝑓=1010,990 K). Depending on these parameters, the flame stabilizes as attached or lifted. In the latter case, flame lifting is caused by the hydrodynamic mechanism associated with global instability, which emerges under a sufficiently strong suction (𝐼≥0.15). For 𝑇𝑐𝑓=1010 K, the critical velocity ratio for global instability and lifted flame stabilization increases with the thickening of shear layers. For 𝑇𝑐𝑓=990 K, the flame appears lifted in all cases where the global instability emerges (𝐼≥0.15), regardless of the shear layer thickness. During the transition to global instability, large toroidal structures form above the inlet plane, and their coherent motion is evident in the velocity spectra. These toroidal structures, along with spontaneously generated side jets, enhance fuel-oxidizer mixing leaning the mixture within a short distance from the inlet. The accompanying large velocity fluctuations increase the scalar dissipation rate, altering the flame stabilization distance. A fuel-rich premixed flow region precedes the wavy flame base. Downstream, diffusion regimes dominate. Such flame structure results in rapid fuel consumption. These findings offer new avenues for optimizing combustion systems and improving their efficiency.

This work was supported by the National Science Center in Poland (Grant No. 2022/47/D/ST8/01902). The research work was carried out using infrastructure of the Poznan Supercomputing and Networking Center.

The readme file contains sorted filenames linked to the figures from the article.

For details on file formats please refer to the readme file and documentation: https://www.tecplot.com/2016/09/16/tecplot-data-file-types-dat-plt-szplt/

(2024-07)

Subject

Engineering; Mathematical Sciences; Physics

Keyword

lifted flame, global instability, self-excited oscillations, counter-current nozzles, hydrogen

Related Publication

Wawrzak, A., Boguslawski, A., & Tyliszczak, A. (2024). The role of suction, initial shear layer thickness, and co-flow temperature on hydrogen flame lift-off in counter-current nozzles. Proceedings of the Combustion Institute, 40(1-4), 105520. https://www.sciencedirect.com/science/article/pii/S1540748924003286 doi: 10.1016/j.proci.2024.105520

License

CC BY - Creative Commons Attribution 4.0

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		readme.txt Plain Text - 2.6 KB - Mar 24, 2025 - 0 Downloads MD5: a16e26fba6da860f9c2e252779a0a8c2 License: CC BY - Creative Commons Attribution 4.0	Preview Download
		Figure1_inlet_profiles.zip ZIP Archive - 4.6 MB - Mar 24, 2025 - 0 Downloads MD5: b95a0b914f00d45e66e09d6d2a10cb14 License: CC BY - Creative Commons Attribution 4.0	Download
		Figure2_3D_Q_FMIX.zip ZIP Archive - 149.9 MB - Mar 24, 2025 - 0 Downloads MD5: 2d1398b2f6cc157a64674d1c0cbcc926 License: CC BY - Creative Commons Attribution 4.0	Download
		Figure3_axial_prof.zip ZIP Archive - 752.5 KB - Mar 24, 2025 - 0 Downloads MD5: a8688aa518f56bb5932e2e6aca8d39b3 License: CC BY - Creative Commons Attribution 4.0	Download
		Figure4_spectra.zip ZIP Archive - 16.9 MB - Mar 24, 2025 - 0 Downloads MD5: 9f43b9e2fdd62306ecb3aa898776a0db License: CC BY - Creative Commons Attribution 4.0	Download
		Figure5_I_St_liftoff_limits.zip ZIP Archive - 2.2 KB - Mar 24, 2025 - 0 Downloads MD5: 8ffcdde0fb752898642122e2e4f8c349 License: CC BY - Creative Commons Attribution 4.0	Download
		Figure68_species_cont_prof.zip ZIP Archive - 125.1 MB - Mar 24, 2025 - 0 Downloads MD5: 7fec3abf8638cc64370897984e44f69e License: CC BY - Creative Commons Attribution 4.0	Download
		Appendix_Temp_anim.zip ZIP Archive - 528.0 MB - Mar 24, 2025 - 0 Downloads MD5: 384fc37e514c316b58cb2bb23a695cf5 License: CC BY - Creative Commons Attribution 4.0	Download

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