| Zugriffsnummer | 23311 |
| Dokumenttyp | Konferenzartikel |
| Sprache | Englisch |
| Titel | Mixture fraction measurements in non-reactive free jet flows |
| Autor(in); Institution |
Markus, Detlef; 3.5, Zünddurchschlagsprozesse, PTB-Braunschweig
Spilling, Michael; 3.5, Zünddurchschlagsprozesse, PTB-Braunschweig
Hornig, Julia; 3.5, Zünddurchschlagsprozesse, PTB-Braunschweig
Klausmeyer, Uwe; 3.5, Zünddurchschlagsprozesse, PTB-Braunschweig
Scholl, Stephan; TU Braunschweig, Institute of Chemical Engineering, Braunschweig, GERMANY
|
| Quelle/Jahr | The 20th International Symposium on Transport Phenomena:(2009) |
| Availability | [CD-ROM] ; file name: pdfs\\89_Final_full_paper.pdf |
| Herausgeber(in) |
Djilali, Ned
|
| ISBN | 978-1-55058-404-2 |
| Verlag | Victoria, BC: Univ., Institute for Integrated Energy Systems (IESVic) |
| Konferenzangaben | The Twentieth International Symposium on Transport Phenomena, Victoria, 07-10, July, 2009, Canada |
| Freie Schlagworte | Flame arresters ; endurance burning ; heat transfer ; thermography ; quenching |
| Zusammenfassung | The ignition of fuel/air mixtures by hot gaseous jet flow is an important process in various fields ranging from industrial explosions and nuclear safety to supersonic combustors. In hazardous areas the hot jet ignition may take place due to a hot jet escaping from flameproof enclosures through inevitable gaps. The hot jet ignition is a complex process which involves chemical reactions coupled with energy and mass transport in urbulent mixing of exhaust and fresh gas. Hence, a numerical model to describe the ignition of premixed gas mixtures by hot free jet flow has to consider the influence of turbulence and chemical kinetics on the ignition process using adequate submodels for mixing, turbulence and chemistry. In this work a Fuel Stratified Injection (FSI) valve is used to expand pre-compressed argon, helium or nitrogen in a prechamber to ease the flow. Then the mixture enters nozzles of different diameters. The pressure of the pre-compressed argon, helium or nitrogen can be varied in the range of 2 up to 7 bar which provides an insight into the mixing process in the interesting velocity range. Themixing process between a free jet and a quiescent nitrogen atmosphere is examined using nitric oxide (NO) as a tracer molecule. NO is excited by means of a dye laser. From the fluorescence intensity it is possible to calculate profiles of the mixture fraction. The experimental setup offers the possibility to measure phase-coupled 2D mixture fraction maps to analyze the mixing process in transient jets with a high repetition rate of 1 Hz and high reproducibility, respectively. The results will be used for the validation of numerical simulations. |
