Device and methods for guiding bleed air in a turbofan gas turbine engine are disclosed. The devices provided include louvers and baffles that guide bleed air toward a bypass duct of the turbofan engine. The louvers and baffles have a geometric configuration that promotes desirable flow conditions and reduced energy loss.

Provided herein are dynamic compressor systems and methods of operation. A compressor system comprises a compressor and a variable flow extractor disposed downstream of the compressor to split a compressor outlet stream into a recirculation stream and a system outlet stream. A variable flow injector disposed upstream of the compressor that mixes the recirculation stream with a system feed stream to form a compressor inlet stream. A controller is configured to receive first data indicative of a pressure of the system outlet stream, second data indicative of a pressure of the system feed stream, and third data indicative of flow rates of at least two of the system feed stream, the system outlet stream, and the recirculation stream. The controller adjusts a flow rate of the recirculation stream via the variable flow extractor and the variable flow injector based on the first, second, and third data.