| 摘要 |
FIELD: machine building.SUBSTANCE: cooled turbine comprises nozzle blades, a heat exchanger. Each nozzle blade is made as a structural element confined by top and bottom shrouds and space there between confined by convex and concave walls of the blade airfoil, in the form of leading edge distribution manifold and a distribution pocket with a transition baffle plate which are set along its axis. Along the inner surfaces of the airfoil walls the baffle plate forms cooling channels communicated with the turbine wheelspace. The inlet of the leading edge distribution manifold is connected to the air pocket of the combustion chamber while its outlet communicates with the wheelspace via perforation holes in the leading blade edge. The heat exchanger inlet is connected to the air pocket of the combustion chamber, and its outlet is successively connected to the air manifold, transition baffle plate of the distribution pocket, transition air duct, twisting nozzle diaphragm, cooling channels for the turbine runner and rotor blade. The cooled turbine is equipped by a cooling baffle plate with perforation holes on its two opposite walls. The cooling baffle plate is installed in the distribution pocket on the wall of the leading edge distribution manifold with a gap in respect to the transition baffle plate and with a gap between the concave and convex walls of the blade airfoil and the walls of the cooling baffle plate with perforation holes. The blade top and bottom shrouds are fitted by air ducts with their outlets being connected to the turbine wheelspace. The air duct inlet in the top shroud and the inlet of the cooling baffle plate are connected to the air manifold. The air duct inlet in the bottom shroud is connected with the outlet of the cooling baffle plate.EFFECT: increased efficiency and cost effectiveness of a turbine.5 cl, 5 dwg |
