English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Zendy Open

Presents the pdf analysis as premium feature

PDF Analysis

Insights

Presents the summarisation as premium feature

Summarisation

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the zaia usage as premium feature

ZAIA

Zendy Tools

Zendy Plus

Presents the access of premium content as premium feature

Premium Content

The present paper reports on the numerical investigation of lifted turbulentjet flames with H2/N2 fuel issuing into a vitiated coflow of lean combustionproducts of H2/air using conditional moment closure method (CMC). A 2Daxisymmetric formulation has been used for the predictions of fluid flow, whileCMC equations are solved with detailed chemistry to represent theturbulence-chemistry interaction. Simulations are carried out for differentcoflow temperatures, jet and coflow velocities in order to investigate theimpact on the flame lift-off height as well as on the flame stabilization.Furthermore, the role of conditional velocity models on the flame has also beeninvestigated. In addition, the effect of mixing is investigated over a range ofcoflow temperatures and the stabilization mechanism is determined from theanalysis of the transport budgets. It is found that the lift-off height ishighly sensitive to the coflow temperature, while the predicted lift-off heightusing the mixing model constant, i.e., C{\Phi}=4, is found to be the closest tothe experimental results. For all the coflow temperatures, the balance is foundbetween the chemical, axial convection and molecular diffusion terms while thecontribution from axial and radial diffusion is negligible, thus indicatingauto-ignition as the flame stabilization mechanism.

Stabilization of lifted hydrogen jet diffusion flame in a vitiated co-flow: effects of jet and coflow velocities, coflow temperature and mixing