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To study the disturbance rejectionFlow surge capabilityWind tunnel of autonomous aircraft, active flow control is required inside a wind tunnelWind tunnel for generating large-scale gusts representative of atmospheric conditions. Sinusoidal flow surgeFlow surge cycles are produced via a removable louvre-type rig in a large, closed-loop wind tunnelWind tunnel, allowing the effects of gust frequency and amplitude on model response to be isolated. It is observed that the surge amplitude decreases with increasing louvre actuation frequency and decreasing blockage. A lower amplitude is often associated with a lower surge quality due to the reduced signal, but high blockages also distort the sine wave to a triangular form, due to a slower flow accelerationAccelerations as the louvres open. In all cases the primary signal is at the louvre frequency. The louvres-open wind speed has less impact on the surge amplitude and quality than the blockage and frequency.

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Generating Sinusoidal Flow Surges in a Large Closed-Loop Wind Tunnel

  • 会议论文

  • 发表日期：

    2026年

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  • Nicholas Kay,
  • Rory Buchanan,
  • Peter Richards,
  • Karl Stol

摘要

To study the disturbance rejectionFlow surge capabilityWind tunnel of autonomous aircraft, active flow control is required inside a wind tunnelWind tunnel for generating large-scale gusts representative of atmospheric conditions. Sinusoidal flow surgeFlow surge cycles are produced via a removable louvre-type rig in a large, closed-loop wind tunnelWind tunnel, allowing the effects of gust frequency and amplitude on model response to be isolated. It is observed that the surge amplitude decreases with increasing louvre actuation frequency and decreasing blockage. A lower amplitude is often associated with a lower surge quality due to the reduced signal, but high blockages also distort the sine wave to a triangular form, due to a slower flow accelerationAccelerations as the louvres open. In all cases the primary signal is at the louvre frequency. The louvres-open wind speed has less impact on the surge amplitude and quality than the blockage and frequency.