Wall interference of Jet-blast is investigated. Jet-blast form airplane is simulated by using a sonic nozzle at a laboratory scale. In this study, far-field velocity distributions are measured by using X-type hot wire anemometer at four measurement planes. Understanding the velocity distributions in faraway downstream is very important when we concern the problems of jet-blast. We also intend to utilize these data to develop new turbulence model on CFD. As a result, HWHM, aspect ratio and spreading rate of wall-jet are consistent with published data [1][2][3][4][5][6]. Distributions of Reynolds stress are analyzed from the data obtained. Interesting property of 𝑤 ̅ distribution is found, that is, peak of 𝑤 ̅ moves outwards on lateral direction as X/D increased. On the other hand, 𝑤′𝑤′ ̅̅̅̅̅̅ distribute around the center of the wall-jet.
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