FIELD: machine engineering.
SUBSTANCE: radial-flow turbine directive nozzle diaphragm of the turbomachine comprises the first annular grid with blades with a fixed installation angle and the second annular grid with the same number of blades with a variable incidence. Each blade of the second grid is rigidly connected to the disks, is designed to rotate the operating facilities around a geometric axis that connects the centers of the disks. Each of the blades has a rear edge and a leading edge for guiding the gas streams flowing around the outer and inner walls of the blade. Each blade with a variable incidence is set at a distance from the disks rotation axis such that the rotation axis is located substantially in front of the outer surface of the blade much closer to its rear edge than to the leading edge. The leading edge of each blade with variable incidence has a thickness exceeding the thickness of the rear edge and a curved aerodynamic shape optimised to absorb the vortex airfoil with a blade located in opposite to the stationary grid.
EFFECT: invention allows to ensure a change in the flow rate of a radial turbine, depending on the requirements of the thermodynamic cycle, and to exclude leaks in the zone of maximum load of the distributor blades.
5 cl, 6 dwg
