Boundary layer flashback model for hydrogen flames in confined geometries including the effect of adverse pressure gradient

Ólafur H. Björnsson, Sikke A. Klein, Joeri Tober

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientificpeer-review

Abstract

The combustion properties of hydrogen make premixed hydrogen-air flames very prone to boundary layer flashback. This paper describes the improvement and extension of a boundary layer flashback model from Hoferichter [1] for flames confined in burner ducts. The original model did not perform well at higher preheat temperatures and overpredicted the backpressure of the flame at flashback by 4-5x. By simplifying the Lewis number dependent flame speed computation and by applying a generalized version of Stratford’s flow separation criterion [2], the prediction accuracy is improved significantly. The effect of adverse pressure gradient flow on the flashback limits in 2 and 4 diffusers is also captured adequately by coupling the model to flow simulations and taking into account the increased flow separation tendency in diffuser flow. Future research will focus on further experimental validation and direct numerical simulations to gain better insight into the role of the quenching distance and turbulence statistics.

Original languageEnglish
Title of host publicationProceedings of the ASME Turbo Expo: Turbomachinery Technical Conference and Exposition
Subtitle of host publicationVolume 4A: Combustion, Fuels, and Emissions
Place of PublicationNew York, NY , USA
PublisherASME
Number of pages12
Volume4A
ISBN (Electronic)978-0-7918-8412-6
DOIs
Publication statusPublished - 2020
EventASME Turbo Expo 2020: Turbomachinery Technical Conference and Exposition, GT 2020 - Virtual, Online
Duration: 21 Sep 202025 Sep 2020

Conference

ConferenceASME Turbo Expo 2020: Turbomachinery Technical Conference and Exposition, GT 2020
CityVirtual, Online
Period21/09/2025/09/20

Fingerprint

Dive into the research topics of 'Boundary layer flashback model for hydrogen flames in confined geometries including the effect of adverse pressure gradient'. Together they form a unique fingerprint.

Cite this