Patent ID: 11867089
Assignee: ROLLS-ROYCE NORTH AMERICAN TECHNOLOGIES, INC.
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F | IPC F

Claim 17:
18. A method of operating a gas turbine engine, the method comprising
providing a combustor including an outer combustor case and an inner combustor case that cooperate to define a combustion chamber, the inner combustor case formed to define at least one cooling passage that extends through the inner combustor case and opens into a cavity, a cooling duct coupled with the outer combustor case of the combustor and arranged to extend along the inner combustor case to define a transfer passageway in fluid communication with the combustion chamber and the cavity, and a valve coupled with the outer combustor case of the combustor and located radially outward of the outer combustor,
allowing a primary flow of air from within the combustion chamber through the at least one cooling passage to the cavity to maintain a minimum amount of cooling air provided to the cavity for all operating conditions of the gas turbine engine,
directing the valve to be in an open position in response to a high-flow condition in the gas turbine engine to allow fluid communication between the cooling duct and the combustion chamber to conduct auxiliary air flow into the cavity from the combustion chamber via the transfer passageway to increase an amount of cooling air provided to the cavity during the high-flow condition in the gas turbine engine,
wherein the entire valve is located radially outward of the outer combustor case.