Application of toluene LIF to transonic nozzle flows to identify zones of incomplete molecular mixing
| Autor: | Thomas Dreier, Matthias Beuting, Christof Schulz, Bernhard Weigand, Judith Richter |
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| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Quenching (fluorescence)
Materials science business.industry Nozzle 01 natural sciences Molecular physics Toluene Signal Atomic and Molecular Physics and Optics 010305 fluids & plasmas chemistry.chemical_compound Optics chemistry Maschinenbau 0103 physical sciences 010306 general physics business Laser-induced fluorescence Transonic Excitation Mixing (physics) |
| Popis: | Toluene laser-induced fluorescence (LIF) has been applied to image the mixing deficit on the molecular level in the transonic wake of two different blunt-body injectors in a compressible accelerated nozzle flow. A single-color excitation and two-color detection scheme is employed to measure the signal red-shift caused by the quenching effect of molecular oxygen on the fluorescence of toluene, which reduces and red-shifts the LIF signal if both substances interact on a molecular level. To this end, toluene is injected alternatingly with O₂-contaning and O₂-free carrier gas into the air main flow. Differences of both signals mark regions where mixing on molecular level is incomplete. A zone of molecular mixing deficit extending several millimeters in stream-wise direction is identified. The effect of local variations in temperature on the sensitivity of this technique is discussed using photo-physical data measured in a stationary low-temperature cell. © 2018 Optical Society of America OA gold - CA Beuting |
| Databáze: | OpenAIRE |
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