The wind tunnel nozzle (14) has an inner nozzle wall, a nozzle outlet edge and a device for breaking the coherent vortex structures of a free jet (16) released from the wind tunnel nozzle. The device has a jet guiding element, which is arranged at the inner nozzle wall and extends in a flow direction. The jet guiding element has a guide surface, which points away and protrudes from the nozzle wall. The jet guiding element defines a longitudinal direction, which extends parallel to the flow direction. An independent claim is included for a wind tunnel with a collector.
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