Device and method for controlling vortex structures in a turbulent air jet

摘要

A device controlling vortex structures in a turbulent air jet flowing out of an air exhaust channel, which is constituted by at least one pair of needles connected to an AC voltage source to create a pulsating corona discharge between the needles. One needle is located along and the other across the flow to produce a resonant effect of the pulsating corona discharge on the vortex structures. In a method for controlling vortex structures in a turbulent air jet, at least one pair of needles connected to an AC voltage source create a pulsating corona discharge between the needles. One needle is located along and the other across the flow to produce a resonant effect of the pulsating corona discharge on the vortex structures.

主权项

1. A device for controlling vortex structures in a turbulent jet flowing out of an exhaust nozzle of a propulsion system of an aircraft engine, the exhaust nozzle having a longitudinal axis, the device comprising:
at least one pair of needles connected to an AC voltage source to create a pulsating corona discharge between the needles, wherein one needle of the at least one pair of needles has a length along a longitudinal axis of the one needle, the longitudinal axis of the one needle being arranged in a direction substantially parallel to the longitudinal axis of the exhaust nozzle, and the other needle of the at least one pair of needles has a length along a longitudinal axis of the other needle, the longitudinal axis of the other needle being arranged in a direction substantially perpendicular to the longitudinal axis of the exhaust nozzle, the at least one pair of needles being arranged to produce a resonant effect of the pulsating corona discharge on the vortex structures.