The purpose of the present invention is to improve the mechanical strength of a boss in correspondence with the direction in which the principal stress is generated in an impeller formed of fiber-reinforced resin. A hub 11 is provided with a first region arranged on the back surface 11b side, and a second region arranged on the front surface 11a side. In the first region the frequency with which the reinforcement fibers F dispersed at the periphery of a boss hole 12 are oriented inclined with respect to the radial direction of the hub 11 is high, and in the second region the frequency with which the reinforcement fibers dispersed at the periphery of the boss hole are oriented along the rotational axis line is high.

An engine may include a plurality of cylinders generating driving torque by burning fuel; a first intake valve disposed in a first intake line in which intake air supplied to the cylinders flows; a second intake valve disposed in a second intake line in which intake air supplied to the cylinders flows; a first electric supercharger disposed in the first intake line; a second electric supercharger disposed in the second intake line; a bypass valve disposed in a bypass line connecting the first intake line and the second intake line; and a controller for controlling the first electric supercharger and the second electric supercharger to be operated in a single mode, a serial mode, or a parallel mode based on an operating region of the engine determined by driving information.

An engine assembly including an engine core including at least one internal combustion engine each including a rotor sealingly and rotationally received within a respective internal cavity to provide rotating chambers of variable volume in the respective internal cavity, a compressor having an outlet in fluid communication with an inlet of the engine core, a first intake conduit in fluid communication with an inlet of the compressor and with a first source of air, a second intake conduit in fluid communication with the inlet of the compressor and with a second source of air warmer than the first source of air, and a selector valve configurable to selectively open and close at least the fluid communication between the inlet of the compressor and the first intake conduit. A method of supplying air to a compressor is also discussed.

An engine assembly including an engine core including at least one internal combustion engine each including a rotor sealingly and rotationally received within a respective internal cavity to provide rotating chambers of variable volume in the respective internal cavity, a compressor having an outlet in fluid communication with an inlet of the engine core, a first intake conduit in fluid communication with an inlet of the compressor and with a first source of air, a second intake conduit in fluid communication with the inlet of the compressor and with a second source of air warmer than the first source of air, and a selector valve configurable to selectively open and close at least the fluid communication between the inlet of the compressor and the first intake conduit. A method of supplying air to a compressor is also discussed.

Methods and systems are provided for a noise mitigating device for a turbocharger compressor. In one example, the noise mitigating device includes a set of perforated rings arranged in a recirculation passage of a compressor casing treatment. The rings of the set of perforated rings may be oriented so that apertures of one ring are offset from apertures of one or more adjacent rings, forcing air to flow through the apertures via a non-linear path while deflecting at least a portion of sounds waves generated in the compressor.

There is disclosed an engine assembly, including an internal combustion engine having a housing and a coolant circuitry in heat exchange relationship with the housing. A porous surface is configured for defining a portion of an external surface of an aircraft. Apertures are defined through the porous surface. The housing of the internal combustion engine is in heat exchange relationship with the porous surface for heating the porous surface. An air conduit has an inlet fluidly connected to a boundary layer region outside the engine assembly and adjacent the porous surface via the apertures of the porous surface. The air conduit is in heat exchange relationship with the coolant circuitry. A forced air system is fluidly connected to the inlet of the air conduit and is operable to draw an airflow from the inlet and inside the air conduit. A method of operating the engine assembly is disclosed.

There is disclosed an engine assembly, including an internal combustion engine having a housing and a coolant circuitry in heat exchange relationship with the housing. A porous surface is configured for defining a portion of an external surface of an aircraft. Apertures are defined through the porous surface. The housing of the internal combustion engine is in heat exchange relationship with the porous surface for heating the porous surface. An air conduit has an inlet fluidly connected to a boundary layer region outside the engine assembly and adjacent the porous surface via the apertures of the porous surface. The air conduit is in heat exchange relationship with the coolant circuitry. A forced air system is fluidly connected to the inlet of the air conduit and is operable to draw an airflow from the inlet and inside the air conduit. A method of operating the engine assembly is disclosed.

Methods and systems are provided for a swirl generating device upstream of a compressor including a method, a system, and an apparatus for actuating the swirl generating device, which is located in a ring-shaped duct, adjust a swirl of air flowing through the ring-shaped duct to the compressor in response to engine operating conditions.

Methods and systems are provided for a swirl generating device upstream of a compressor including a method, a system, and an apparatus for actuating the swirl generating device, which is located in a ring-shaped duct, adjust a swirl of air flowing through the ring-shaped duct to the compressor in response to engine operating conditions.

A supercharger includes a rotor housing defining a pair of cylindrical chambers. A driving shaft bearing is to support a driving rotor shaft for rotation in the rotor housing. A driven shaft bearing is to support a driven rotor shaft for rotation in the rotor housing. An oil sump housing is to enclose a timing gear end of the rotor housing. A shaft seal is disposed between the rotor housing and each respective rotor shaft. The oil sump housing, the rotor housing and driving and driven shaft seals define a closed container for oil to lubricate the driving shaft bearing, the driven shaft bearing, a driving timing gear and a driven timing gear. The oil pools in the closed container and a top surface of the oil is spaced below the timing gears when the driving rotor shaft is in a vertical orientation.