Internal Air System Gas Turbine

In: Science

Submitted By supershakir
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Pages 11
Drive Cone Cavity


The drive cone cavity is one of the hottest un-cooled components in the engine. Operating around 900k at 10,000 rpm, the material used in making the drive cone is operating at edge of its safe working temperature changes at these high temperatures. A 10 K rise in shaft temperature can reduce the life of the shaft. The temperature must therefore be predicted to within 10 K or better to guarantee accurate stress predictions. It the thermal model cannot guarantee the 10 K accuracy required, a much shorter component life would have to be declared or alternative materials must be found. This report contains the different type of the materials which can be used to enhance the performance of the drive cone cavity and in order to do so the criteria is sub-divided into four group as shown in figure 1

Key drivers for the selection of the material Fig 1

Trends in aero-engine materials use

As shown in Fig 2 the trends in increase of high temperature materials for gas turbine part. Although there are many monolithic ceramics materials show evidence of fundamental properties, but the main issue is relative to their application in aero engines has been their flaw sensitivity and brittle fracture modes. In addition fibre CMCs are very appealing materials due to (i) their high temperature performance as compared with other super alloys and (ii) their higher fracture toughness relate with monolithic ceramics in aero engines, in which structural reliability is most required. For that reason, CMCs are potential materials to meet these requirements in drive cone cavity.

Trends in aero-engine materials use Fig 2

Nickel-based super alloys

Most of the improvement in material for gas turbine component has been…...

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