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A gas turbomachine inlet system includes a duct member having an inlet portion fluidically coupled to an outlet portion through an intermediate portion. The inlet portion, outlet portion, and intermediate portion define a fluid flow zone. A throttling system is arranged in the duct member at one of

A gas turbomachine inlet system includes a duct member having an inlet portion fluidically coupled to an outlet portion through an intermediate portion. The inlet portion, outlet portion, and intermediate portion define a fluid flow zone. A throttling system is arranged in the duct member at one of the inlet portion, outlet portion and intermediate portion. The throttling system is configured and disposed to selectively establish a pressure drop through the fluid flow zone. A method of controlling inlet pressure drop through an inlet system for a gas turbomachine is also described herein.

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1. A gas turbomachine inlet system, the gas turbomachine inlet system comprising a gas turbomachine that comprises a compressor, a turbine and a combustor, the gas turbomachine inlet system comprising: a duct member having an inlet portion fluidically coupled to an outlet portion through an intermed

1. A gas turbomachine inlet system, the gas turbomachine inlet system comprising a gas turbomachine that comprises a compressor, a turbine and a combustor, the gas turbomachine inlet system comprising: a duct member having an inlet portion fluidically coupled to an outlet portion through an intermediate portion, the inlet portion, outlet portion and intermediate portion defining a fluid flow zone, the duct member being separate from the gas turbomachine and connected to the gas turbomachine at the compressor; andat least one throttling system arranged in the duct member at one of the inlet portion, outlet portion, and intermediate portion, the at least one throttling system being configured and disposed to selectively establish a pressure drop through the fluid flow zone, and one of the at least one throttling system includes an inflatable diaphragm. 2. The gas turbomachine inlet system according to claim 1, wherein the at least one throttling system further includes a plurality of louvers arranged at the inlet portion of the duct member, the plurality of louvers being configured to be selectively shiftable between a first, low pressure drop position that provides a substantially unrestricted inlet zone of the duct member and a second, high pressure drop position that provides a substantially restricted inlet zone of the duct member. 3. The gas turbomachine inlet system according to claim 2, wherein each of the plurality of louvers includes a center pivot defining a pivot axis. 4. The gas turbomachine inlet system according to claim 1, wherein the at least one throttling system further includes a plurality of louvers arranged at the intermediate portion of the duct member, the plurality of louvers being configured to be selectively shiftable between a first, low pressure drop position that provides a substantially unrestricted flow path through the intermediate portion and a second, high pressure drop position that provides a substantially restricted flow path through the intermediate portion. 5. The gas turbomachine inlet system according to claim 1, wherein the at least one throttling system further includes a restrictor member mounted along the intermediate portion of the duct member, the restrictor member being configured and disposed to be selectively shiftable between a first, low pressure drop position and a second, high pressure drop position. 6. The gas turbomachine inlet system according to claim 5, wherein the restrictor member includes a first end section that extends to a second end section, the first end section defining a pivot axis for the restrictor member. 7. The gas turbomachine inlet system according to claim 6, wherein the at least one throttling system includes an actuator member configured and disposed to pivot the restrictor member between the first and second position. 8. The gas turbomachine inlet system according to claim 1, wherein the inflatable diaphragm positioned at the outlet portion of the duct member, the flow restriction device being configured and disposed to move between a first, low pressure drop position that provides a substantially unrestricted outlet zone of the duct member and a second, high pressure drop position that provides a substantially restricted outlet zone of the duct member. 9. The gas turbomachine inlet system according to claim 8, wherein the inflatable diaphragm extends about an inner perimeter of the outlet portion of the duct member. 10. A method of controlling the inlet pressure drop through an inlet system for a gas turbomachine, the method comprising: establishing an operating mode for the gas turbomachine; andadjusting a throttling system provided in a duct member of the inlet system to control the inlet pressure to the gas turbomachine based on the operating mode;wherein adjusting the throttling system includes selectively shifting a plurality of louvers arranged in the duct member between a first, low pressure drop position, and a second, high pressure drop position,wherein adjusting the throttling system includes selectively shifting a restrictor member arranged in the duct member between a first, low pressure drop position, and a second, high pressure drop position; andwherein adjusting the throttling system includes selectively inflating a flow restriction device arranged in the duct member between a first, low pressure drop position, and a second, high pressure drop position. 11. The method of claim 10, further comprising: sensing exhaust emissions of the gas turbomachine operating in the operating mode; andadjusting the throttling system based on the sensed exhaust emissions to reduce the exhaust emissions without changing the operating mode. 12. The method of claim 10, further comprising: calculating one of an estimated gas turbomachine emissions and an estimated combustion reference temperature through a real time engine simulation model; andadjusting the throttling system based on the one of the estimated gas turbomachine emissions and the estimated combustion reference temperature. 13. A gas turbomachine comprising: a compressor portion having a compressor inlet;a turbine portion mechanically coupled to the compressor portion;a combustor assembly fluidically connected to the compressor portion and the turbine portion; andan inlet system fluidically connected to the compressor inlet, the inlet system comprising:a duct member having an inlet portion fluidically coupled to an outlet portion through an intermediate portion, the inlet portion, outlet portion, and intermediate portion defining a fluid flow zone, the duct member being separate from the gas turbomachine and connected to the gas turbomachine at the compressor; andat least one throttling system arranged in the duct member at one of the inlet portion, outlet portion, and intermediate portion, the at least one throttling system being configured and disposed to selectively establish a pressure drop through the fluid flow zone, and one of the at least one throttling system includes an inflatable diaphragm. 14. The gas turbomachine according to claim 13, wherein the at least one throttling system further includes a plurality of louvers arranged at one of the inlet portion and the intermediate portion of the duct member, the plurality of louvers being configured to be selectively shiftable between a first, low pressure drop position that provides a substantially unrestricted inlet zone of the duct member and a second, high pressure drop position that provides a substantially restricted inlet zone of the duct member. 15. The gas turbomachine according to claim 13, wherein the at least one throttling system further includes a restrictor member mounted along the intermediate portion of the duct member, the restrictor member being configured and disposed to be selectively shiftable between a first, low pressure drop position and a second, high pressure drop position. 16. The gas turbomachine according to claim 13, wherein the inflatable diaphragm is positioned at the outlet portion of the duct member, the inflatable diaphragm being configured and disposed to move between a first, low pressure drop position that that provides a substantially unrestricted outlet zone of the duct member and a second, high pressure drop position that provides a substantially restricted outlet zone of the duct member. 17. A gas turbomachine inlet system, the gas turbomachine inlet system comprising a gas turbomachine that comprises a compressor, a turbine and a combustor, the gas turbomachine inlet system comprising: a duct member having an inlet portion fluidically coupled to an outlet portion through an intermediate portion, the inlet portion, outlet portion and intermediate portion defining a fluid flow zone, the duct member being separate from the gas turbomachine and connected to the gas turbomachine at the compressor; anda throttling system arranged in the duct member at one of the inlet portion, outlet portion, and intermediate portion, the throttling system being configured and disposed to selectively establish a pressure drop through the fluid flow zone;wherein the throttling system includes a plurality of louvers arranged at the inlet portion of the duct member, the plurality of louvers each of the plurality of louvers includes a center pivot defining a pivot axis and being configured to be selectively shiftable between a first, low pressure drop position that provides a substantially unrestricted inlet zone of the duct member and a second, high pressure drop position that provides a substantially restricted inlet zone of the duct member;wherein the throttling system includes a plurality of louvers arranged at the intermediate portion of the duct member, the plurality of louvers being configured to be selectively shiftable between a first, low pressure drop position that provides a substantially unrestricted flow path through the intermediate portion and a second, high pressure drop position that provides a substantially restricted flow path through the intermediate portion;wherein the throttling system includes a restrictor member mounted along the intermediate portion of the duct member, the restrictor member being configured and disposed to be selectively shiftable between a first, low pressure drop position and a second, high pressure drop position;wherein the throttling system includes a flow restriction device positioned at the outlet portion of the duct member, the flow restriction device being configured and disposed to move between a first, low pressure drop position that provides a substantially unrestricted outlet zone of the duct member and a second, high pressure drop position that provides a substantially restricted outlet zone of the duct member, the flow restriction device extends about an inner perimeter of the outlet portion of the duct member and the flow restriction device comprises an inflatable diaphragm.