Large-scale structures in a slit nozzle turbulent air jet.

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概要

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• The present investigation was carried out to obtain a better understanding of the turbulent structure in a slit nozzle air jet. A series of measurements were made simultaneously by using arrays of hot-wire anemometers with x-probes. The signals were digitized and recorded on magnetic tape. Based on the data, instantaneous velocity vector fields seen from a frame moving at a constant velocity were drawn. They confirm the existence of a row of large-scale eddies whose rotation directions are the same and also show that the interaction of these eddies beyond the jet centerline forms a configuration of quasiperiodic counter-rotating eddies approximately alternating on opposite sides of the centerline in both the transitional and the fully developed turbulent regions of a slit nozzle jet.<BR>Inward large-scale flow, whose longitudinal <I>u</I>′ and lateral <I>v</I>′ fluctuating velocities are both negative, and outward large-scale flows, whose <I>u</I>′ and <I>v</I>′ are both positive, appear frequently in a slit nozzle jet. The former and the latter respectively correspond to the "ejection" and the "sweep" in a turbulent boundary layer.

• The Society of Chemical Engineers, Japanの論文

著者

• YUU Shinichi

  Department of Mechanical Engineering, Kyushu Institute of Technology

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• Large-scale structures in a slit nozzle turbulent air jet.

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