Effects of Pulsation Intensities on Flame Characteristics of a Small Backward-Inclined Jet Flame in Crossflow
| Autor: | Ching Min Hsu, Farha Khan, Dickson Bwana Mosiria |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Fluid Flow and Transfer Processes
Jet (fluid) Materials science 020209 energy General Engineering Reynolds number 02 engineering and technology Mechanics Condensed Matter Physics Combustion Momentum symbols.namesake 020401 chemical engineering Thermocouple 0202 electrical engineering electronic engineering information engineering symbols General Materials Science 0204 chemical engineering Wind tunnel |
| Zdroj: | Journal of Thermal Science and Engineering Applications. 12 |
| ISSN: | 1948-5093 1948-5085 |
| Popis: | The effects of pulsation intensities on the flame characteristics of a 10 deg-backward-inclined jet flame in the crossflow were investigated in a wind tunnel. The jet and the crossflow Reynolds numbers were 1527 and 2165, respectively. The jet-to-crossflow momentum flux ratio was 0.10. A loudspeaker was used to acoustically excite the jet flame. The excitation Strouhal number was 0.73, while the jet pulsation intensities varied from 0 to 1.26. The flame behaviors were studied through photography techniques. The flame temperatures were measured using a fine-wire R-type thermocouple. The combustion-induced emissions were probed by a commercial multi-gas analyzer. The jet flames were categorized into five characteristic modes with increasing pulsation intensities. Mode I was characterized by a yellowish down-washed recirculation flame, a blue neck flame, and a yellow tail flame. Modes II and III featured a split yellow tail flame, a yellowish recirculation flame, and a blue neck flame. Mode IV was characterized by a blue down-washed recirculation flame and neck flame, as well as a split yellow tail flame. Mode V was identified by a single yellow tail flame and the absence of the down-washed recirculation flame. When the jet flames were excited beyond mode I, the combustion-induced pollutants of carbon monoxide and nitric oxide were significantly reduced. However, the excited jet flame in mode V displayed low temperatures in the near-tube region. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|