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A device to produce vehicle braking from a two-shaft gas turbine engine including an air brake with a centrifugal impeller on the power turbine shaft, the impeller having blades forwardly turned at the impeller exit through an angle greater than sixty degrees for absorbing energy from the power turb

A device to produce vehicle braking from a two-shaft gas turbine engine including an air brake with a centrifugal impeller on the power turbine shaft, the impeller having blades forwardly turned at the impeller exit through an angle greater than sixty degrees for absorbing energy from the power turbine shaft thereby to control power transfer to an output shaft. The system includes a variable inlet control assembly to throttle inlet air flow to the air brake impeller so as to regulate the amount of power absorption from the power turbine shaft.

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In a two-shaft gas turbine engine of the type including a gasifier compressor coupled on one end of a first shaft having a gasifier turbine on the opposite end thereof and a power turbine connected to a second shaft having means thereon for transferring power from the power turbine shaft to a vehicl

In a two-shaft gas turbine engine of the type including a gasifier compressor coupled on one end of a first shaft having a gasifier turbine on the opposite end thereof and a power turbine connected to a second shaft having means thereon for transferring power from the power turbine shaft to a vehicle transmission and wherein the gasifier compressor supplies compressed air to a burner assembly which discharges combustion products through the gasifier turbine and the power turbine, the improvement comprising: a rear bulkhead on the engine having a concave opening extending axially inboard of said engine, a portion of the power shaft extending axially through said opening, an air brake compressor mounted directly on the power turbine shaft within said opening, said air brake compressor having an inlet and an outlet, said compressor including an impeller having a hub with a radially outwardly curved surface extending from said inlet to outlet, a plurality of blades on said impeller secured to said curved surface, each of said blades having an inducer portion for directing flow from said inlet into said impeller, each of said blades having a segment downstream of and curved continuously from said inducer portion forwardly in the direction of impeller rotation and extending to the outlet, said downstream segment having a forward curvature at the outer periphery of said impeller in excess of 60°from a plane through the center of the impeller, inlet guide vanes in the inlet to said air brake compressor to control mass air flow to the compressor, said vanes having an open brake position and a partially closed run position, said vanes throttling the inlet air flow to the air compressor in the run position to cause limited air flow through the air brake compressor to maintain cooling thereof during run operation and reduced parasitic power losses, said vanes guiding greater mass air flow to said blades at said brake position and said downstream segments of said blades to produce a high level of specific work on said greater mass air flow to produce a ratio of brake power loss when the vanes are in a brake position to parasitic power loss when the vanes are in a run position not less than eight-to-one.