Flame stabilization characteristics of turbulent hydrogen jet flame diluted by nitrogen

Zhenhua Tang, Zhirong Wang, Kun Zhao

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

Hydrogen is already widely produced and used in the industry. NOx formation during the combustion of hydrogen can be reduced by adding nitrogen. Nonetheless, this comes at the cost of decreased flame stability, which constrains the applicability of hydrogen. Therefore, the flame stabilization characteristics of nitrogen-diluted hydrogen jet flame at varying dilution concentrations (10%–50%) were investigated using thin-lipped nozzles with diameters of 2, 3, and 5 mm. The experimental results show that the nitrogen-diluted jet flame becomes bluer and the flame height and width decrease with the dilution concentration. Due to the incomplete combustion at downstream of the diluted jet flame, the classical prediction model using the dimensionless flame Froude number (Frf) overpredicts the flame height of nitrogen-diluted hydrogen jet flame. The model, [Formula presented], can effectively predict the flame lift-off distance of diluted hydrogen jet flames, where SL is the corresponding laminar combustion speed in the lean mixture zone (Φ = 0.91). A unified prediction model of blowout limit based on the Damköhler number for diluted hydrogen and hydrocarbon jet flames was proposed for the first time. This study helps to better understand the instability mechanism of diluted hydrogen.

Original languageEnglish
Article number129100
JournalEnergy
Volume283
DOIs
StatePublished - 15 Nov 2023

Keywords

  • Blowout
  • Diluted hydrogen
  • Dilution concentration
  • Flame stabilization
  • Lift-off distance

Fingerprint

Dive into the research topics of 'Flame stabilization characteristics of turbulent hydrogen jet flame diluted by nitrogen'. Together they form a unique fingerprint.

Cite this