Afterburner for a turbofan engine

An afterburner for a turbofan engine having a generally annular external casing extending about a longitudinal axis, an outer wall spaced inwardly from the external casing so as to define a main air bypass passageway therebetween, an inner wall spaced inwardly from the outer wall so as to define an exhaust gas casing and a generally annular afterburner wall spaced inwardly from the external casing and defining an outer boundary of an afterburner chamber, comprising at least one connecting arm connecting the inner wall to the outer wall, each connecting arm defining:

• an air chamber;
• at least one inlet opening defined by the connecting arm communicating between the air chamber and the main air bypass passageway to allow a portion of the bypass air to pass into the air chamber;
• at least one outlet opening defined by the connecting arm and communicating between the air chamber and the afterburner chamber to allow air in the air chamber to pass into the afterburner chamber so as to form a first bypass air passageway;
• and a downstream edge facing the afterburner chamber spaced from an upstream end of the afterburner wall to define a second bypass air passageway between the downstream edge of the connecting arm and the afterburner wall, wherein each connecting arm has opposite sides, each opposite side defining a channel extending radially with respect to the longitudinal axis and further comprising at least one fuel conduit disposed in each channel.

An afterburner for a turbofan engine having a generally annular external casing extending about a longitudinal axis, an outer wall spaced inwardly from the external casing so as to define a main air bypass passageway therebetween, an inner wall spaced inwardly from the outer wall so as to define an exhaust gas casing and a generally annular afterburner wall spaced inwardly from the external casing and defining an outer boundary of an afterburner chamber, comprising:

• (a) at least one connecting arm connecting the inner wall to the outer wall, each connecting arm defining:
• an air chamber;
• at least one inlet opening defined by the connecting arm communicating between the air chamber and the main air bypass passageway to allow a portion of the bypass air to pass into the air chamber;
• and at least one outlet opening defined by the connecting arm and communicating between the air chamber and the afterburner chamber to allow air in the air chamber to pass into the afterburner chamber so as to form a first bypass air passageway;
• and (b) at least one flameholder extending inwardly from the outer wall, each flameholder defining:
• a second air chamber;
• a second inlet communicating with the main air bypass passageway and the second air chamber;
• and a plurality of second outlets communicating between the second air chamber and the afterburner chamber.

An afterburner for a turbofan engine having a generally annular external casing extending about a longitudinal axis, an outer wall spaced inwardly from the external casing so as to define a main air bypass passageway therebetween, an inner wall spaced inwardly from the outer wall so as to define an exhaust gas casing and a generally annular afterburner wall spaced inwardly from the external casing and defining an outer boundary of an afterburner chamber, comprising at least one connecting arm connecting the inner wall to the outer wall, each connecting arm defining:

• an air chamber;
• at least one inlet opening defined by the connecting arm communicating between the air chamber and the main air bypass passageway to allow a portion of the bypass air to pass into the air chamber;
• at least one outlet opening defined by the connecting arm and communicating between the air chamber and the afterburner chamber to allow air in the air chamber to pass into the afterburner chamber so as to form a first bypass air passageway;
• a downstream end wall oriented in a plane extending substantially perpendicular to the longitudinal axis, the end wall defining the at least one outlet opening;
• at least one flameholder extending inwardly from the outer wall, each flameholder defining:
• a second air chamber;
• a second inlet communicating with the main air bypass passageway and the second air chamber;
• and a plurality of second outlets communicating between the second air chamber and the afterburner chamber.

An afterburner for a turbofan engine having a generally annular external casing extending about a longitudinal axis, an outer wall spaced inwardly from the external casing so as to define a main bypass passageway therebetween, an inner wall spaced inwardly from the outer wall so as to define an exhaust gas casing and a generally annular afterburner wall spaced inwardly from the external casing and defining an outer boundary of an afterburner chamber, comprising at least one connecting arm connecting the inner wall to the outer wall, each connecting arm defining:

• an air chamber;
• at least one inlet opening defined by the connecting arm communicating between the air chamber and the main air bypass passageway to allow a portion of the bypass air to pass into the air chamber;
• at least one outlet opening defined by the connecting arm and communicating between the air chamber and the afterburner chamber to allow air in the air chamber to pass into the afterburner chamber so as to form a first bypass air passageway;
• a downstream edge facing the afterburner chamber spaced from an upstream end of the afterburner wall to define a second bypass air passageway between the downstream edge of the connecting arm and the afterburner wall;
• at least one flameholder extending inwardly from the outer wall, each flameholder defining:
• a second air chamber;
• a second inlet communicating with the main air bypass passageway and the second air chamber;
• and a plurality of second outlets communicating between the second air chamber and the afterburner chamber.