A power module includes a turbine arranged along a rotation axis, an interconnect shaft fixed in rotation relative to the turbine, and a compressor with a regenerative compressor wheel. The regenerative compressor wheel is fixed in rotation relative to the interconnect shaft supported for rotation with the turbine about the rotation axis. Generator arrangements, unmanned aerial vehicles, and methods of generating electrical power are also described.

A modular gas turbine system is disclosed. The system includes a base plate and a gas turbine engine mounted on the base plate. The gas turbine engine has a rotation axis, a first air compressor section and a second air compressor section. A rotating load is mechanically coupled to the gas turbine engine and mounted on the base plate. A supporting frame extends above the base plate and supports a plurality of secondary coolers, which are fluid exchange relationship with an intercooler of the gas turbine engine.

A turbofan engine according to an example of the present disclosure includes, among other things, a fan including an array of fan blades rotatable about an engine axis, a compressor including a first compressor section and a second compressor section, the second compressor section including a second compressor section inlet with a compressor inlet annulus area, a fan duct including a fan duct annulus area outboard of the second compressor section inlet, and a turbine having a first turbine section driving the first compressor section, a second turbine section driving the fan through an epicyclic gearbox, the second turbine section including blades and vanes, and wherein the second turbine section defines a maximum gas path radius and the fan blades define a maximum radius, and a ratio of the maximum gas path radius to the maximum radius of the fan blades is less than 0.6.

A portable green power system is disclosed that is capable of generating electric power based on green technologies (i.e., environmentally friendly) of high performance, low emissions, and low noise. The portable power system consists of three key design features including a free-floating shaft, an electric motor assisted airblast injector and four concentric channel flows. The engine is partitioned into separate channels or passages for the compressed air, hot gases, recuperation, and the engine case and are organized into four concentric channels for portable design and easy maintenance considerations. The concentric channel design also facilitates fully developed flow in each channel for reduction of vibration and noise. The four concentric channels include turbine concentric channel, compressor concentric channel, recuperator concentric channel and engine case concentric channel. Two-way bypass rings are used for cross flows among these concentric channel flows.

A gas turbine engine includes an inlet duct, a compressor section, a combustor section, and a turbine section connected to drive the compressor section. The compressor section includes circumferentially-spaced blades having abrasive blade tips. A seal is disposed radially outwards of the blades. The seal includes a substrate that has a substrate hardness, an abradable layer that has an abradable layer hardness, and a hard interlayer between the substrate and the abradable layer. The hard interlayer has an interlayer hardness that is higher than the abradable layer hardness and higher than the substrate hardness.

A core engine article includes a combustor liner defining a combustion chamber therein and a turbine nozzle. The combustor liner includes a plurality of injector ports, and the plurality of injector ports have a shape that tapers to a corner on a forward side of the injector ports. The turbine nozzle includes a plurality of airfoils. The combustor liner and turbine nozzle are integral with one another. A method of making a core engine article is also disclosed.

A gas turbine engine includes a compressor section and turbine section. The gas turbine engine of the present disclosure is a relatively small gas turbine engine, configured to generate less than 2,000 horsepower during peak operations. The compressor section defines an overall compressor ratio of at least 15:1 in order to increase in overall efficiency of the gas turbine engine.

A gas turbine engine (10) for an aircraft comprises an engine core (11) comprising a turbine (19), a compressor (14), and a core shaft (26) connecting the turbine to the compressor; a fan (23) located upstream of the engine core (11), the fan comprising a plurality of fan blades (64) extending from a hub (66); and a gearbox (30) that receives an input from the core shaft (26) and outputs drive to the fan (23) so as to drive the fan at a lower rotational speed than the core shaft. The gas turbine engine (10) has an engine length (110) and a gearbox location (112) relative to a forward region of the fan (23), and a gearbox location ratio of:

gearbox location/engine length is in a range from 0.19 to 0.45.

An airflow control system for a gas turbine system according to an embodiment includes: a compressor component of a gas turbine system for generating an excess flow of air; a mixing area for receiving an exhaust gas stream produced by the gas turbine system; an air extraction system for extracting at least a portion of the excess flow of air generated by the compressor component of the gas turbine system to provide bypass air; and diverting the bypass air into the mixing area to reduce a temperature of the exhaust gas stream; and an exhaust processing system for processing the reduced temperature exhaust gas stream.

Aspects of the disclosure are directed to a thrust reverser of an aircraft. Aspects are directed to a first array of cascades, a second array of cascades, and a sleeve configured to selectively block or unblock the first and second arrays of cascades. The sleeve may be configured such that when the thrust reverser is stowed a first portion of an interface associated with the sleeve is at a first axial location and a second portion of the interface is at a second axial location that is different from the first axial location. The first axial location may substantially coincide with a first circumferential positioning of the first array of cascades and the second axial location may substantially coincide with a second circumferential positioning of the second array of cascades.