Patent ID: 8286895
Filing Date: 2012-10-16
Classification: F15D

Abstract:
1. A method for creating a microjet having a desired frequency of pressure oscillation, comprising: a. providing a primary nozzle, said primary nozzle directing a primary jet of compressible fluid with said primary jet exiting said primary nozzle at a primary nozzle exit plane, said primary jet having a diameter “d”; b. providing a source of pressurized gas through said primary nozzle to create said primary jet, said pressurized gas flowing through said nozzle creating a nozzle pressure ratio; c. providing an impingement block including a cavity commencing at a cavity entrance plane parallel to said primary nozzle exit plane and separated therefrom by a distance “h”; d. said cavity including a cavity floor separated from said cavity entrance plane by a distance “L”; e. said cavity including at least one micronozzle extending through said cavity floor; and f. adjusting the ratio L/d to produce a pressure oscillation in said microjet which is approximately equal to said desired frequency of pressure oscillation.