Abstract
We tried to generate a gust front in a multi-fan type wind tunnel in order to clarify the detailed structure of a gust front. Velocity fluctuations after the passage of the gust front were investigated. The conditioning measurements of velocity fluctuations were also made with two X-wire probes. Fully developed turbulent flow was observed in the upper layer of the gust. A periodic pattern like K-H instability wave was embedded in the turbulent fluctuation near Z=200mm. On the other hand, only turbulent motion was observed near ground. Though the strong gust was found to correspond to sweep motion, it does not exist only in the lower shear layer but correlate with large scale turbulent motion across over the whole layer of the gust.
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