This ¢ xperimental study aims at investigating thc turbulent d 正 ffusion mechanism ofjets . in particular 亡 he relatjonship between the static pressure and the lateral mean velocjty on the development of a 重 wodiimensiona 】air jet . Th ¢ dimensional jet with three injection ve 】 ocitjes ( lL7, 23, 3 and 35. Om 〆 s ) was generated in a two −dimensional wind tunncl . The velocity disnibutions wcre measured by X ・ type hot−wire anemorneteL Th ¢ static pressure distributiDns were measured by the

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... tic pressure probe that was deve】 oped in ore laboTatoT 》 -using a hot − wire anemomcter . The result ofexperiment was that the n ¢ gative static pressure exists in the tUrbulent sh¢ ar 藍 ayeL lt is ◎Dnsidered that the entrainment proceed frDm the negative staIjc pressure by the eddy motion ofthe turbulcnt shear ] ayer .