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| title | Selective Two-Photon Absorptive Resonance Femtosecond-Laser Electronic-Excitation Tagging (STARFLEET) Velocimetry in Flow and Combustion Diagnostics |
| Full Text URI | http://hdl.handle.net/2060/20160010168 |
| Author(eng) | Gord, James R.; Roy, Sukesh; Jiang, Naibo; Stauffer, Hans U.; Halls, Benjamin R.; Danehy, Paul M. |
| Issue Date | 2016-06-13 |
| Language | eng |
| Description | Selective Two-Photon Absorptive Resonance Femtosecond-Laser Electronic-Excitation Tagging (STARFLEET), a non-seeded ultrafast-laser-based velocimetry technique, is demonstrated in reactive and non-reactive flows. STARFLEET is pumped via a two-photon resonance in N2 using 202.25-nm 100-fs light. STARFLEET greatly reduces the per-pulse energy required (30 J/pulse) to generate the signature FLEET emission compared to the conventional FLEET technique (1.1 mJ/pulse). This reduction in laser energy results in less energy deposited in the flow, which allows for reduced flow perturbations (reactive and non-reactive), increased thermometric accuracy, and less severe damage to materials. Velocity measurements conducted in a free jet of N2 and in a premixed flame show good agreement with theoretical velocities and further demonstrate the significantly less-intrusive nature of STARFLEET. |
| NASA Subject Category | Fluid Mechanics and Thermodynamics |
| Report No | NF1676L-24487 |
| Rights | Copyright, Distribution as joint owner in the copyright |
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