Patent ID: 8225592
Filing Date: 2012-07-24
Classification: F02K

Abstract:
1. A microjet system for controlling a far-field noise component of a jet engine that has an exhaust port from which the jet engine issues a first jet flow having a first jet flow mass, the microjet system comprising a plurality of microjets located on a frame, each microjet fluid flow connected to a source of high pressure liquid or gas stream and each microjet simultaneously issuing a continuous second jet flow directed at the first jet flow at one or more angles relative to the first jet flow and beyond the boundary of the first jet flow and ambient air immediately adjacent the exhaust port of the jet, each second jet flow having a second jet flow mass, such that the combined second jet flow masses are smaller than the first jet flow mass, such that the combined second jet flows interact with the first jet flow in order to disrupt a far-field noise component of the first jet flow, and such that each microjet is separately dynamically actively controlled as to its angle so as to vary the angle at which the microjet's second jet flow intercepts the first jet flow and also controllable as to whether the respective microjet issues its second jet flow or prevents issuance of the second jet flow, wherein the frame is attached to a pop-up head assembly of a blast deflector, the blast deflector being selectively extended or retracted and attached to either a ground surface or to a deck of a ship, and wherein the source of high pressure liquid or gas stream is from a source that is separate from the jet engine.