SYSTEM FOR THERMALLY SHIELDING A PORTION OF A GAS TURBINE SHROUD ASSEMBLY

• Main Authors: SHAPIRO, JASON DAVID, BOGARD, JUSTIN H
• Format: Patent
• Language: English; French
• Published: 12.11.2019
• Subjects: AIR INTAKES FOR JET-PROPULSION PLANTS; BLASTING; COMBUSTION ENGINES; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS; ENGINE PLANTS IN GENERAL; GAS-TURBINE PLANTS; HEATING; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS; LIGHTING; MACHINES OR ENGINES IN GENERAL; MECHANICAL ENGINEERING; NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAMTURBINES; STEAM ENGINES; WEAPONS

In one aspect the present subject matter is directed to a system for thermally shielding a portion of a shroud assembly for a gas turbine. The system includes a shroud support haying a forward wall that includes a front side that is axially spaced from a back side and a radially inner surface that extends axially between the front and back sides. A shroud is mounted to the shroud support. The shroud includes a leading edge portion that extends towards the forward wall of the shroud support and a trailing edge portion that extends towards the aft wall of the shroud support. A radial gap is defined between a top surface of the leading edge portion and the radially inner surface of the forward wall. A thermal shield is disposed along a bottom portion of the forward wall and is oriented to face towards a flow of combustion gases. Dans un aspect, le présent objet porte sur un système disolation thermique dune portion dun assemblage denveloppe de turbine dune turbine à gaz. Le système comprend un support denveloppe ayant une paroi avant qui comprend un côté avant qui est espacé axialement dun côté arrière et une surface interne radialement qui se prolonge axialement entre les côtés avant et arrière. Une enveloppe est installée sur le support denveloppe. Lenveloppe comprend une portion de bord dattaque qui se prolonge vers la paroi arrière du support denveloppe et une portion de bord de traînée qui se prolonge vers la paroi arrière du support denveloppe. Un espacement radial est défini entre une surface de dessus de la portion de bord dattaque et la surface interne radialement de la paroi avant. Un bouclier thermique est disposé le long dune portion de bas de la paroi avant et orienté pour faire face à un flux de gaz de combustion.