Details
| Translated title of the contribution | Structure of turbulent premixed flames with ignition or extinction |
|---|---|
| Original language | German |
| Pages | 366-369 |
| Number of pages | 4 |
| Volume | 50 |
| Issue number | 8 |
| Journal | Gaswaerme International |
| Publication status | Published - Aug 2001 |
| Externally published | Yes |
Abstract
In flames with high degree of turbulence local extinction and ignition processes can be of significant importance. For their description sufficient criteria and mo-dels are not available. In this paper some experimental investigations are reported to describe the lift-off height of premixed bluff-body stabilized flames, being an important model flame for technical burners with flame stabilization due to recirculation. Comparison of measured flame lift-off height for significantly varied exit velocity and stoichiometry with different theoretical models (ignition delay model, local extinction model) shows that no unique model can be found here. While for very lean flames the ignition delay is found to be rate determining, in other cases the lift-off height can be determined by a newly described mixing delay model. A dimensionless turbulent strain rate, often described with a Kovasznay or Karlovitz number, is not a sufficient criterion here.
ASJC Scopus subject areas
- Engineering(all)
- Building and Construction
- Energy(all)
- Energy Engineering and Power Technology
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In: Gaswaerme International, Vol. 50, No. 8, 08.2001, p. 366-369.
Research output: Contribution to specialist publication › Contribution in non-scientific journal › Transfer
}
TY - GEN
T1 - Struktur turbulenter vormischflammen bei zünd- oder verlöschvorgängen
AU - Dinkelacker, F.
AU - Most, D.
AU - Leipertz, A.
PY - 2001/8
Y1 - 2001/8
N2 - In flames with high degree of turbulence local extinction and ignition processes can be of significant importance. For their description sufficient criteria and mo-dels are not available. In this paper some experimental investigations are reported to describe the lift-off height of premixed bluff-body stabilized flames, being an important model flame for technical burners with flame stabilization due to recirculation. Comparison of measured flame lift-off height for significantly varied exit velocity and stoichiometry with different theoretical models (ignition delay model, local extinction model) shows that no unique model can be found here. While for very lean flames the ignition delay is found to be rate determining, in other cases the lift-off height can be determined by a newly described mixing delay model. A dimensionless turbulent strain rate, often described with a Kovasznay or Karlovitz number, is not a sufficient criterion here.
AB - In flames with high degree of turbulence local extinction and ignition processes can be of significant importance. For their description sufficient criteria and mo-dels are not available. In this paper some experimental investigations are reported to describe the lift-off height of premixed bluff-body stabilized flames, being an important model flame for technical burners with flame stabilization due to recirculation. Comparison of measured flame lift-off height for significantly varied exit velocity and stoichiometry with different theoretical models (ignition delay model, local extinction model) shows that no unique model can be found here. While for very lean flames the ignition delay is found to be rate determining, in other cases the lift-off height can be determined by a newly described mixing delay model. A dimensionless turbulent strain rate, often described with a Kovasznay or Karlovitz number, is not a sufficient criterion here.
UR - http://www.scopus.com/inward/record.url?scp=0035415254&partnerID=8YFLogxK
M3 - Beitrag in Publikumszeitung/-zeitschrift
AN - SCOPUS:0035415254
VL - 50
SP - 366
EP - 369
JO - Gaswaerme International
JF - Gaswaerme International
SN - 0020-9384
ER -