Abstract: A propulsion system according to an exemplary aspect of the present disclosure includes, among other things, a pressurant selectively released from a pressure tank to drive a pump to sustain propellant flow for main combustion.

Abstract: A solid rocket motor includes a propellant grain and a barrier shielding at least a portion of the grain. The barrier is impermeable to water, oxygen, nitrogen, and volatile solid propellant species.

Abstract: A propulsion system according to an exemplary aspect of the present disclosure includes, among other things, a pressurant selectively released from a pressure tank to drive a pump to sustain propellant flow for main combustion.

Abstract: A gas turbine engine includes a transient plasma igniter in communication with a continuous detonation wave combustor. A method of operating a gas turbine engine includes maintaining ignition of a continuous detonation wave combustor with a transient plasma igniter.

Abstract: A method for controlling a boundary layer over a vehicle surface includes generating an ionic wind using a network of emitters and receivers. An external fluid is propelled with the ionic wind over the vehicle surface. The strength of the ionic wind is controlled to adjust the boundary layer thickness.

Abstract: A disclosed additive manufacturing machine includes a fixed platform defining a work surface for supporting fabrication of a part and a housing defining a chamber over the work surface. A material applicator is supported on the housing for depositing material onto the work surface. An energy directing device is also supported on the housing and directs energy within the chamber to form a part. The housing is movable relative to the work surface therefore moves the energy producing device relative to the work surface to maintain a distance between the energy directing device and a surface of the part during fabrication.

Abstract: A fluid separation system includes a separation membrane having a pattern of features thereon.

Abstract: A rotary engine includes a first rotary unit operable to provides a first phase of compression to a fresh air charge drawn in through an inlet port to the first rotary unit. A second rotary unit in communication with the first rotary unit through a first passage, the second rotary unit operable to provide a second phase of compression to the first phase of compression, a combustion phase and a first phase of expansion, the second rotary unit in communication with the first rotary unit through a second passage such that the first rotary unit provides a second phase of expansion to the first phase of expansion and an exhaust phase that exhausts the first rotary unit via an exhaust port. A first fuel injector is in communication with the second rotary unit operable to initiate the combustion phase and a second fuel injector is in communication with the first rotary unit operable to selectively initiate augmented operation.

Abstract: A system includes a diesel engine and a fuel-cracking system in fluid communication with a fuel supply to the diesel engine.

Abstract: A disclosed additive manufacturing machine includes a work surface for supporting fabrication of part and a housing defining a chamber over the work surface. A material applicator supported on the housing deposits material onto the work surface and a blocker plate disposed between the material applicator and the work surface for blocking a portion of material deposited by the material applicator. An energy directing device is supported on the housing and directing energy within the chamber to form the part.

Abstract: A disclosed additive manufacturing machine includes a fixed platform defining a work surface for supporting fabrication of a part and a housing defining a chamber over the work surface. A material applicator is supported on the housing for depositing material onto the work surface. An energy directing device is also supported on the housing and directs energy within the chamber to form a part. The housing is movable relative to the work surface therefore moves the energy producing device relative to the work surface to maintain a distance between the energy directing device and a surface of the part during fabrication.

Abstract: A system includes a diesel engine and a fuel-cracking system in fluid communication with a fuel supply to the diesel engine.

Abstract: An inlet system, including for an auxiliary power unit includes an inlet louver mounted to an inlet duct, the inlet louver defines a multiple of vanes positioned to shield the inlet duct from fluids which fall in direction generally transverse to a free stream airflow.

Abstract: A rocket engine includes a thrust chamber having a cooling channel, which is adapted to provide sustained cracking conditions for a fluid (e.g., kerosene) within the cooling channel under steady-state engine operating conditions. An augmenter having a fluid input communicates with an output of the cooling channel, and an output of the augmenter is in fluid communication with a turbine. A pump is mechanically coupled to the turbine, and provides fluid flow to the inlet of the cooling channel.

Abstract: A fluid separation system includes a separation membrane having a pattern of features thereon.

Abstract: A rotary-wing system which generates a directed ion field to propel a fluid along a rotary-wing to control at least one boundary layer characteristic.

Abstract: A boundary layer control system and method for controlling and adjusting the boundary layer of a fluid flowing over a surface.

Abstract: A heliostat includes a joint with a range of motion in both elevation and azimuth of more than 90 degrees.

Abstract: A non-propulsive projectile and method of maneuvering the non-propulsive projectile. The non-propulsive projectile includes a divert system with a multiple of valves to maneuver the projectile in response to a control system.

Abstract: A non-propulsive projectile and method of maneuvering the non-propulsive projectile. The non-propulsive projectile includes a divert system with a multiple of valves to maneuver the projectile in response to a control system.