Development of a pair of concentric jets issuing into an axisymmetric cavity were experimentally investigated by using a single component LDV system. Major concern of the study was centered around the mixing process between the two concentric turbulent jets and the secondary recirculating flow in the upstream corner of the cavity. The velocity ratio of inner jet to outer one was varied from 0.6 to 1.4 with the outer jet velocity fixed at a constant value. The wall pressure, mean velocity and turbulent intensities in axial and circumferential direction were measured in the whole cavity. The result show that the velocity ratio between the two jets effects appreciably the reattachment length, wall pressure distribution and particularly turbulent intensity profile in the initial jet mixing region. Detailed description of the turbulent flow characteristics is given in the text.
