ANNULAR DIFFUSER FOR AXIAL TURBINE MACHINE, SYSTEM FOR AXIAL TURBINE MACHINE, AS WELL AS AXIAL TURBINE MACHINE Russian patent published in 2014 - IPC F04D29/54 

FIELD: machine building.

SUBSTANCE: axial turbine machine system includes a flow passage restricted with external and internal walls and a guide vanes grid. An annular diffuser having external and internal walls is located downstream of the guide vanes grid. The external wall of the annular diffuser is located downstream of the external wall of the flow passage and/or the internal wall of the annular diffuser is located downstream of the internal wall of the flow passage. The annular diffuser includes a section on which the surface of the internal and/or external wall is rotational and asymmetric. Rotational and asymmetric surface is located downstream of gaps formed with freely standing ends of curved bodies of vanes of the above grid and the internal or the external wall of the flow passage. The section of the annular diffuser with the rotational and asymmetric surface is located on the side of the annular diffuser flow inlet and is changed over to a rotational and asymmetric downstream section. Another invention of the group refers to an axial turbine machine, which includes the above system.

EFFECT: inventions allow reducing aerodynamic losses in a turbine machine diffuser.

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