Reinforced shaped composite shell

Abstract

A gas turbine casing (10) made of composite material, said casing having an axisymmetric shape and comprising, along an axial direction (DA): an upstream flange (14); a holding area (15), said holding the thickness of the zone is greater than the rest of the shell; and the downstream flange (16). Housing (10) in the axial direction (D A ) and the radial direction (D R ) has a profile in section on a plane defined, said profile comprising at least first and second sloped portions (17, 18), said first and second sloped portions (17, 18) relative to each other and relative to Axis of the housing (A 10 )tilt. The first and second sloping portions meet at a point (S10) between the retaining area (15) and one of the flanges (16, 14), which is connected to the first and second sloping portions (17, 18). ) corresponding to the vertex (19) of the angle (β1) formed. Angle (β 1 ) vertex (19) and the average radius of the shell (Rm 10 ) between the distance (d 19 ) within the range of 1.5% and 4% of said mean radius of the shell.

Description

technical field [0001] The present invention relates to gas turbine casings, and more particularly, but not exclusively, to gas turbine fan casings for aircraft engines. Background technique [0002] In gas turbine aero-engines, the fan casing performs several functions. In particular, it defines an air inlet passage into the engine, which optionally supports abradable material facing the tips of the fan blades and / or a sound absorber structure for acoustic treatment at the engine inlet, which incorporates or supports a retaining shroud . [0003] Housings, such as fan housings, used to be made of metallic materials, but are now made of composite materials, i.e. fiber preforms of composite materials densified with an organic matrix, enabling the manufacture of components that, when they When made of metallic material, the part has a lower overall weight than the same part, while also having at least equal, if not greater, mechanical strength. A fan housing made of organic...

AI Technical Summary

Problems solved by technology

However, this solution leads to a substantial increase in the overall size and weight of the housing

Furthermore, due to the complex omega-shape of the housing, it was found difficult to manufacture and install equipment (e.g. acoustic panels, wearable boxes) on this type of housing

Finally, the cavity formed by the Ω-shaped part requires filling material, further detrimental to the overall weight of the case

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