| 摘要 |
PROBLEM TO BE SOLVED: To raise the control power of an ultrasonic nozzle for a flow of a gas blown out from its outlet by reducing the whole range of a boundary layer formed in the nozzle body to increase the sectional area of a main flow of the gas corresponding to the whole boundary layer forming range. SOLUTION: A nozzle body 11 has a throat 13 for reducing the flow of a gas blown from an inlet 12 into a space between the inlet 12 for blowing the gas in and the outlet 14 for blowing the gas out. Suction pipes 31-34 for sucking out the gas in a boundary layer B formed along the inner side wall of the nozzle body 11 are provided on the side wall of the body 11, in a range L limited by a diagonal line T1 crossing an outlet bend point N1 of the throat 13 and a diagonal line T2 crossing an intersection point N2 of a characteristic line P specified by a diameter D of the outlet 14 and a Mach number M of the gas at the outlet 14. The center axial line O of the nozzle body 11 and the pipes 31-34 are connected to gas suction blowers P1-P4.
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