Abstract: A burner for a gas turbine including a burner housing is provided. Provided is a lean-rich partially premixed low emission burner for a gas turbine combustor providing stable ignition and combustion process at all engine load conditions. At the upstream end of that burner a pilot combustor creates a flow of an unquenched concentration of radicals and heat. Respectively provided is a plurality of quarl sections surrounding the exit of the pilot combustor, a main combustion room defined downstream the pilot combustor and at least a first channel defined as an annular space between an upstream quarl section and the closest downstream quarl section providing air and fuel to a main flame in the combustion room.

Abstract: A burner including a gas injector for injecting fuel into the burner for a gas turbine engine is provided. The burner is provided with a quarl, which surrounds a combustion room, at least a first channel emerging into the combustion room for providing the combustion room with air mixed with fuel, a swirler for mixing the air and the fuel located at the inlet of the channel, at least one tube for the provision of fuel at an inlet of at least one channel, wherein the tube is provided with a plurality of diffuser holes distributed along the tube acting as gas injectors for effectively distributing fuel in a flow of air passing through the channel.

Abstract: A quarl of a burner for a gas turbine engine is provided. Fuel and air is mixed and provided to the burner. The quarl is arranged to house a main flame. Stability is achieved by a quarl, which is formed from a plurality of quarl sections, wherein each quarl section includes the configuration of the conical shell of a truncated cone and are distributed consecutively one after the other in the downstream direction of the burner, wherein a most narrow part of the shell of a downstream quarl section surrounds the widest part of the shell of the closest upstream quarl section and wherein an annular channel for premixed air and fuel is arranged between two consecutive quarl sections.

Abstract: A swirler for premixing a flow of fuel and a flow of air provided to a burner for a gas turbine engine is provided. The burner is provided with a swirler for mixing the air and the fuel and wherein the swirler is provided with swirler wings, wherein a channel formed between two adjacent swirler wings defines a passage. The swirler includes one fuel tube for gaseous fuel positioned in parallel on each side of a mixing rod in the passage, wherein the fuel tubes are provided with a plurality of diffuser holes distributed along the tube acting as gas injectors for efficiently distributing fuel in a flow of air passing through the swirler passage.

Abstract: A pilot combustor particularly for use in a burner of a gas turbine engine is provided. A method for burning a fuel in a pilot combustor zone of a pilot combustor is also provided. The pilot combustor includes rotationally symmetric walls defining a combustion room with an exit having a rich concentration of fuel in air for burning the fuel for the creation of a flow of an non equilibrium unquenched concentration of radicals elevated to a temperature above 2000 K in the combustion room and directed along a centre line of the pilot combustor through a throat at the exit of the pilot combustor, wherein a quarl is located downstream of the throat of the pilot combustor. According to the method the pilot combustor is arranged upstream of a burner for providing a main lean partially premixed combustion process.

Abstract: A swirler for premixing a flow of fuel and a flow of air provided to a burner for a gas turbine engine is provided. The burner is provided with a swirler for mixing the air and the fuel and wherein the swirler is provided with swirler wings, wherein a channel formed between two adjacent swirler wings defines a passage. The swirler includes one fuel tube for gaseous fuel positioned in parallel on each side of a mixing rod in the passage, wherein the fuel tubes are provided with a plurality of diffuser holes distributed along the tube acting as gas injectors for efficiently distributing fuel in a flow of air passing through the swirler passage.

Abstract: A burner for a gas turbine including a burner housing is provided. Provided is a lean-rich partially premixed low emission burner for a gas turbine combustor providing stable ignition and combustion process at all engine load conditions. At the upstream end of that burner a pilot combustor creates a flow of an unquenched concentration of radicals and heat. Respectively provided is a plurality of quarl sections surrounding the exit of the pilot combustor, a main combustion room defined downstream the pilot combustor and at least a first channel defined as an annular space between an upstream quarl section and the closest downstream quarl section providing air and fuel to a main flame in the combustion room.

Abstract: A burner including a gas injector for injecting fuel into the burner for a gas turbine engine is provided. The burner is provided with a quarl, which surrounds a combustion room, at least a first channel emerging into the combustion room for providing the combustion room with air mixed with fuel, a swirler for mixing the air and the fuel located at the inlet of the channel, at least one tube for the provision of fuel at an inlet of at least one channel, wherein the tube is provided with a plurality of diffuser holes distributed along the tube acting as gas injectors for effectively distributing fuel in a flow of air passing through the channel.

Abstract: A method for a staging operation at start up of a burner for a gas turbine engine combustor is provided. The method will stabilize the combustion of a lean-rich partially premised low emission burner for a gas turbine combustor at all engine load conditions. The method includes, adding fuel mixed with air to the pilot combustor, igniting the mixture utilizing an igniter provided at an upstream end of the pilot combustor for initiating a lean flame inside the pilot combustor and for providing the flow of the radicals and heat, imparting a swirl of fuel and air at the outside at the exit of the pilot combustor at the upstream end of the combustion room for creating and sustaining the main lean flame and gradually adding a swirl of air and fuel for establishing a full load stage to at least one channel.

Abstract: A method for upscaling the size of a burner of a gas turbine engine including a burner housing is provided. The burner is provided with a mixture of fuel and air at an upstream end from a premixing channel that sustains a main flame at a downstream end of the burner. The premixing channel is defined at the exit by a circular inner wall formed by an inner quarl section and a circular outer wall formed by an outer quarl section. The burner may be increased in size by adding a quarl section outside and circumferentiating the quarl section and forming an annular space between the added quarl section and the existing outer quarl section and by adding a premixing channel defined at the exit by a circular inner wall formed by the previously outmost quarl section and the circular outer wall formed by the added quarl section.

Abstract: A quarl of a burner for a gas turbine engine is provided. Fuel and air is mixed and provided to the burner. The quarl is arranged to house a main flame. Stability is achieved by a quarl, which is formed from a plurality of quarl sections, wherein each quarl section includes the configuration of the conical shell of a truncated cone and are distributed consecutively one after the other in the downstream direction of the burner, wherein a most narrow part of the shell of a downstream quarl section surrounds the widest part of the shell of the closest upstream quarl section and wherein an annular channel for premixed air and fuel is arranged between two consecutive quarl sections.

Abstract: The subject application is directed to burners for gas turbine engines that use a pilot flame to assist in sustaining and stabilizing the combustion process. An embodiment of the disclosed burners includes, inter alia, a burner housing, a pilot combustor and a quencher. The burner housing has axially opposed upstream and downstream end portions. Additionally, the housing has at least one main fuel inlet passage and at least one main air inlet passage which are adapted to supply fuel and air respectively to an internal chamber defined in the housing. The pilot combustor is disposed along the axis of the burner housing and has an inlet for receiving a rich fuel and air mixture, a combustion chamber within which the rich fuel and air mixture is combusted into combustion products, and an outlet for exhausting the combustion products from the combustion chamber. The quencher is disposed within the internal chamber of the burner housing along the central axis and positioned at the outlet of the pilot combustor.

Abstract: Disclose is a burner for a gas turbine combustor that uses a central bluff body flame holder and a quarl to shape the recirculation zone in order to stabilize the combustion process. The burner includes, among other elements, a cylindrical main body and a flame holder. The flame holder is disposed within a fuel-air mixing chamber and includes a base portion and an elongated bluff body. The base portion engages with the main body of the burner in a supporting manner and the elongated bluff body extends in an axially downstream direction from the base portion through the internal mixing chamber so as to position a combustion ignition point downstream of the internal mixing chamber. In a representative embodiment, the burner further includes a quarl device disposed adjacent to the downstream end portion of the burner main body. The quarl device defines an interior recirculation chamber and a burner exit.