CONDITIONAL SAMPLING OF VELOCITY AND SCALARS IN TURBULENT FLAMES USING SIMULTANEOUS LDV-RAMAN SCATTERING.

Laser-Doppler Velocimetry (LDV) has achieved widespread use, particularly in combustion flows, where high temperatures limit the use of conventional probes, such as hot wires and Pitot probes. The LDV measures the velocity of individual particles, which also represent the fluid velocity and which are, in most cases, artificially added to the flow. From an ensemble of such individual realizations of velocity, a probability distribution of velocity P(u, v) is generated. We establish the limits of this potential bias by measuring the velocity distribution when only the fuel is seeded P//f//u//e//l(u, v) and then when only the air flow is seeded P//a//i//r(u, v). In addition to establishing these limits, we present a data reduction strategy which will generate the unbiased probability distribution P(u, v).