A system, comprising: a gas turbine combustor, comprising: a combustion liner disposed about a combustion region; a flow sleeve disposed about the combustion liner; an air passage between the combustion liner and the flow sleeve; a structure, wherein the structure obstructs an airflow path through the air passage; an aerodynamic wake reducer configured to redirect an airflow around the structure to reduce a wake region down stream of the structure; and the wake reducer comprising a flow control surface extending at least partially around the structure, the flow control surface having an aerodynamic shape and comprising first and second surfaces disposed on opposite first and second sides of the structure, the first surface extending between a leading edge and a trailing edge on the first side of the structure, and the second surface extending between the leading edge and the trailing edge on the second side of the structure, wherein the aerodynamic wake reducer is configured to divide the airflow into a first flow and a second flow at the leading edge thereof and wherein the first and second flows (106, 108) combine near the trailing edge thereof to form a downstream flow in a wake region downstream of the structure; characterised in that the structur extends between the combustion liner and the flow sleeve and in that the system further comprises a fuel injector downstream of the wake reducer the wake reducer. a gas turbine combustor, comprising: a combustion liner disposed about a combustion region; a flow sleeve disposed about the combustion liner; an air passage between the combustion liner and the flow sleeve; a structure, wherein the structure obstructs an airflow path through the air passage; an aerodynamic wake reducer configured to redirect an airflow around the structure to reduce a wake region down stream of the structure; and the wake reducer comprising a flow control surface extending at least partially around the structure, the flow control surface having an aerodynamic shape and comprising first and second surfaces disposed on opposite first and second sides of the structure, the first surface extending between a leading edge and a trailing edge on the first side of the structure, and the second surface extending between the leading edge and the trailing edge on the second side of the structure, wherein the aerodynamic wake reducer is configured to divide the airflow into a first flow and a second flow at the leading edge thereof and wherein the first and second flows (106, 108) combine near the trailing edge thereof to form a downstream flow in a wake region downstream of the structure; characterised in that the structur extends between the combustion liner and the flow sleeve and in that the system further comprises a fuel injector downstream of the wake reducer the wake reducer. a combustion liner disposed about a combustion region; a flow sleeve disposed about the combustion liner; an air passage between the combustion liner and the flow sleeve; a structure, wherein the structure obstructs an airflow path through the air passage; an aerodynamic wake reducer configured to redirect an airflow around the structure to reduce a wake region down stream of the structure; and the wake reducer comprising a flow control surface extending at least partially around the structure, the flow control surface having an aerodynamic shape and comprising first and second surfaces disposed on opposite first and second sides of the structure, the first surface extending between a leading edge and a trailing edge on the first side of the structure, and the second surface extending between the leading edge and the trailing edge on the second side of the structure, wherein the aerodynamic wake reducer is configured to divide the airflow into a first flow and a second flow at the leading edge thereof and wherein the first and second flows (106, 108) combine near the trailing edge thereof to form a downstream flow in a wake region downstream of the structure; characterised in that the structur extends between the combustion liner and the flow sleeve and in that the system further comprises a fuel injector downstream of the wake reducer the wake reducer.