EXPERIMENTAL VERIFICATION OF EFFECTS OF TURBULENT BOUNDARY LAYERS ON CHEMICAL-KINETIC MEASUREMENTS IN A SHOCK TUBE

摘要

Experiments were conducted to demonstrate the existence and magnitude of the effects of nonuniform shock-tube flow on kinetic results. Atomicoxygen concentration was observed in a rich H2/CO/Ar mixture behind incident shocks that produced turbulent boundary-layers and essentially constant shock-front temperatures, at eight initial pressures from 50 to 120 torr. The exponential time-constant for growth of [0] and the time at which peak concentration occurs are governed by the rate constant for H + 02 →OH + O. Values of the rate constant were fit to the 120-torr data using two analyses:one incorporating the boundary-layer effects on flow properties and residence time as formulated by Mirels;and the othernmaking the conventional assumption of constant post-shock conditions. Two sets of predictions were then made for the lower-pressure runs and compared with experiment.