ENVELOPED BLADE FOR TURBO-MACHINE Russian patent published in 1999 - IPC

FIELD: turbine manufacture. SUBSTANCE: enveloped blade has internally cooled hollow feather-carrying blade, non-cooled shaped envelope with working medium flowing around it and clearance provided between blade and envelope, as well as at least one screen with projections on its surface. Either of members, that is, non-cooled envelope or screen, installed in clearance is made in the form of shaped double-walled hollow shell; air is evacuated from space between walls. At least one additional screen is loosely mounted in evacuated space, its shape being adequate to that of shell walls. Envelope-to-blade clearance is sealed; envelope, screen, and blade surfaces are covered with heat- reflecting coating. EFFECT: improved efficiency and power capacity of turbo-machine. 5 cl, 6 dwg