An axial flow turbine machine intended for elastic fluid operation comprises a rotor (11) with two or more sections (26, 27) each carrying an array of radially directed drive blades (24; 64), and a stator (10) having a number of fluid inlet nozzles (12) and one or more sections (15) each carrying a circumferential array of guide vanes (14; 54) for directing motive fluid onto the drive blades (24; 64), wherein a flow path (30; 60) is formed between every two adjacent drive blades (24; 64) in each rotor section (26, 27) and a flow path (29; 59) is formed between every two adjacent guide vanes (14; 54) in each stator section (15), and a widened section (F, E) is provided between the entrance section (A, C) and the exit section (B, D) of each one of the rotor section flow paths (30; 60) and the stator section flow paths (29; 59), such that the radial distance between the inner flow path defining surface (28) and the outer flow path defining surface (18) is larger in the widened section (F, E) than in the exit section (B, D). |