Accessing the soot-related radiative heat feedback in a flame spreading in microgravity: optical designs and associated limitations

Novel, high-fidelity results related to soot from microgravity flames were obtained by an international topical team on fire safety in space. More specifically, embedded optical techniques for evaluation of the soot-related radiative feedback base material a spreading non-premixed flame developed. The configuration used non-buoyant axisymmetric propagating opposed laminar stream over Low Density PolyEthylene coating electrical wire. Within this context, both standard Broadband Two Color Pyrometry (B2CP) and its recent extension Modulated Absorption/Emission (BMAE) technique can be deployed measure spatial distribution temperature volume fraction within flame. Both fields are then processed establish field local balance attributed flame, ultimately contribution flux present study first assesses consistency methodology contrasting experimental frame synthetic one, latter being produced signal modeling that processes delivered numerical simulation as inputs. Using signals obtained, computed significant discrepancies disclosed locally between originating BMAE B2CP Nevertheless, subsequent heat wire shows weak deviation among implemented is expected. This finding corroborated similar evaluations conducted with measurements parabolic flights. As ISS SCEM rig, will soon provide long-duration observations microgravity. In order contrast upcoming results, current quantifies post-processing regarding fraction, methods should consistent.