초록 ▼

A gas turbine engine is so constructed that the clearance or gap between the rotor and stator, especially at the outer diameter range of a radial flow end stage, is optimally maintained under all operating conditions. For this purpose the housing in the axial-flow/radial-flow compressor is construct

A gas turbine engine is so constructed that the clearance or gap between the rotor and stator, especially at the outer diameter range of a radial flow end stage, is optimally maintained under all operating conditions. For this purpose the housing in the axial-flow/radial-flow compressor is constructed as a two shell housing. The outer housing shell is mounted as part of the engine structure, whereby the inner housing shell is exposed substantially only to forces or loads caused by compressor fluid flow. The material of the outer housing shell has a heat expansion coefficient in the axial direction of the rotational engine axis, which is distinctly lower than the heat expansion coefficient of the material of the compressor rotor. The heat expansion coefficient of the material of the inner housing shell is lower in the circumferential direction and approximately equal in the axial direction relative to the heat expansion coefficient of the rotor. The fixed bearing of the compressor rotor is arranged in the zone of the compressor inlet.

대표청구항 ▼

A gas turbine engine having a longitudinal axis and an intake zone, comprising compressor means having an axial flow compressor section and a radial flow compressor section including respective rotor means made of a material having a first axially and circumferentially effective heat expansion coeff

A gas turbine engine having a longitudinal axis and an intake zone, comprising compressor means having an axial flow compressor section and a radial flow compressor section including respective rotor means made of a material having a first axially and circumferentially effective heat expansion coefficient, and respective stator means, fixed bearing means in said intake zone for mounting said rotor means in said stator means with an optimal clearance in the outer diameter area between said rotor means and said stator means for optimal efficiency, said engine further comprising compressor housing means including outer housing shell means (3) made of a material having a second axially effective heat expansion coefficient which in the direction of said longitudinal axis is measurably, distinctly lower than said first heat expansion coefficient, inner housing shell means (4) made of a material having a third axially effective heat expansion coefficient which, in the direction of said longitudinal axis is approximately equal to said first heat expansion coefficient, said material of said inner housing shell (4) having a fourth circumferentially effective heat expansion coefficient which in a circumferential direction, is lower than said first heat expansion coefficient, and means mounting said outer housing shell means in such a position in said engine structure that said outer housing shell means is connected to said inner housing shell means substantially in one plane only and thus becomes part of the engine structure so that said inner housing shell means is exposed substantially only to deforming forces caused by fluid flow through said compressor means for protecting said outer housing shell means against forces caused by compressor fluid flow, whereby during operation any variations in said optimal clearance are substantially eliminated.