COOLING ELEMENT OF TURBOMACHINE BLADE Russian patent published in 2019 - IPC F01D5/18 

FIELD: turbines or turbomachines.

SUBSTANCE: turbomachine cooled blade element (1) comprises air cooling duct (4), mounted inside blade in radial direction along inlet edge (5), connected by inlet diffuser in direction of cooling air ducts (6) through distributing header (7) with feeder, and output channels (8) with blade outer surface (2), while input diffuser (6) and output channels (8) are made tangentially relative to air cooling duct (4), which is equipped with transit pipeline (9) installed eccentrically inside it, with variable gap relative to its inner wall (10). In this case, along air flow in cooling duct (4), diffuser short curvilinear channel (12) is formed, on inner wall (10) of which radially longitudinal semi-cylindrical projections (11) are made in inlet edge area (5), that connects to input diffuser channels (6), forming common channel with ratio of total cross-sectional areas at input (6) and output channels (8) in the interval of 2.0<F_{output channel}/F_{input channel}<3.6. In addition, geometrical parameters of locations and dimensions of semi-cylindrical protrusions are determined.

EFFECT: invention allows to reduce thermal stresses and increase blades working life.

3 cl, 3 dwg