N2 CARS thermometry and O2 LIF concentration measurements in a flame under electrically induced microbuoyancy
2003; Elsevier BV; Volume: 133; Issue: 3 Linguagem: Inglês
10.1016/s0010-2180(03)00011-7
ISSN1556-2921
AutoresMichael James Papac, Derek Dunn‐Rankin, Christopher B. Stipe, Donald Lucas,
Tópico(s)Thermochemical Biomass Conversion Processes
ResumoMicrogravity combustion is fundamentally characterized by the absence of buoyancy driven flows. To facilitate a large range of diagnostics on microgravity flames, it is useful to create an equivalent microbuoyant condition in an earth-based laboratory. This experiment simulates microbuoyancy using electric fields to balance local convection in a region of the flame. Previous studies used N2 coherent anti-Stokes Raman spectroscopy (CARS) temperature measurements to show that a region exists in which the temperature profile corresponds to that of a spherically symmetric diffusion profile, as would be expected in a true microgravity environment. The current study utilizes CARS thermometry and laser induced fluorescence (LIF) to examine the temperature and O2 concentration profiles in a region below the flame. The results show that the electrically balanced flame apparatus produces a spherically symmetric wedge of microbuoyant flame extending 10° from the vertical axis of the capillary flame arrangement; thereby quantifying the extent of the microbuoyant region.
Referência(s)