Gas turbine ejector and method of operation

A turbine engine comprising;

• a multistage compressor and a multistage turbine;
• an extraction system operable to divert compressed air from the multi-stage compressor to the multistage turbine, the extraction system comprising;
• a first extraction circuit for diversion of low pressure compressed air and a second extraction circuit for diversion of high pressure compressed air to the turbine;
• a cross-over circuit extending between the first and the second extraction circuits for selective flow therebetween;
• an ejector assembly disposed in the cross-over circuit, for combining the low pressure compressed air and the high pressure compressed air, including a nozzle chamber in communication with the second extraction circuit, and having an inlet for receiving the high pressure compressed air and an outlet defining multiple nozzles and a central axis;
• a suction chamber in communication with the first extraction circuit, and having an inlet for receiving the low pressure compressed air, an outlet and configured to receive the outlet of the nozzle chamber therein;
• and
• multiple high pressure flow streams defined by the multiple nozzles and having multiple surface areas for interlayer drag between the multiple high pressure flow streams to thereby entrain the low pressure compressed air in the suction chamber to define an intermediate pressure, compressed air flow stream, the multiple nozzles each having an outlet end that includes a series of undulations, and wherein each of the series of undulations include an apex that is oriented towards the central axis of the outlet of the nozzle chamber, and the undulations are generally axisymmetric with respect to the central axis.

A method for combining a high pressure fluid flow stream with a low pressure fluid flow stream from a multistage compressor of a turbine engine comprising;

• diverting low pressure compressor air through a low pressure extraction circuit and diverting high pressure compressor air through a high pressure extraction circuit;
• delivering the low pressure compressor air to an inlet of a suction chamber in an ejector assembly,
• delivering the high pressure compressor air to an inlet of a nozzle chamber having an odd number of multiple outlet nozzles disposed within the suction chamber and proximate to an outlet thereof, the outlet having a central axis and the multiple outlet nozzles being arranged such that none of the multiple outlet nozzles are located at the central axis, wherein the multiple outlet nozzles each have an outlet end that includes a series of undulations, and wherein each of the series of undulations include an apex that is oriented towards the central axis of the outlet of the nozzle chamber, and the undulations are generally axisymmetric with respect to the central axis;
• and
• ejecting said high pressure compressor air through the multiple outlet nozzles to define multiple high pressure flow streams, defined by the multiple outlet nozzles, having multiple surface areas for interlayer drag between the multiple high pressure flow streams to thereby entrain the low pressure compressed air in the suction chamber to define an intermediate pressure, compressed air flow stream.