SIMULTANEOUS SCALER VELOCITY FIELD-MEASUREMENTS IN TURBULENT GAS-PHASE FLOWS/

In studying both nonreacting hows and flames it is useful to combine v arious imaging techniques to gain information that is not available fr om either instantaneous or time-averaged point measurements. The prese nt work demonstrates a technique for combining particle-image velocime try with planar laser-induced fluorescence in both a seeded air jet an d a premixed flame. The results, which provide instantaneous images of both scalar and velocity fields, can be used to measure velocity dist ributions relative to contours in the scalar image. Of particular inte rest in the flame experiments is the ability to observe variations in the velocity field relative to contours of fuel concentration. In addi tion, the location of measured velocity vectors can be identified as b eing in either reactant or product regions of the flame. This capabili ty permits the measurement of the mean and the fluctuations of both th e product and reactant velocity fields.