Browse Prior Art Database

Blade Root Splitting

IP.com Disclosure Number: IPCOM000205489D
Original Publication Date: 2011-Mar-29
Included in the Prior Art Database: 2011-Mar-29
Document File: 2 page(s) / 149K

Publishing Venue

Siemens

Related People

Juergen Carstens: CONTACT

Abstract

Blade root attachments of industrial and heavy duty gas turbines are mechanically highly loaded regions, due to - among others – aerodynamic and centrifugal forces. As a result, the blade root needs to withstand against mechanical stress. The shape of the root falls within certain closely defined parameters which have been found to give optimum properties to the root. Especially the fir tree type root for a blade of a gas turbine engine has been found advantageous. During the evaluation of such a root, it is assumed that not all of the teeth of the blade root attachment are under mechanical loading.

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Blade Root Splitting

Idea: Fathi Ahmad, DE-Mülheim an der Ruhr; Artur Mol, DE-Mülheim an der Ruhr

Blade root attachments of industrial and heavy duty gas turbines are mechanically highly loaded regions, due to - among others - aerodynamic and centrifugal forces. As a result, the blade root needs to withstand against mechanical stress. The shape of the root falls within certain closely defined parameters which have been found to give optimum properties to the root. Especially the fir tree type root for a blade of a gas turbine engine has been found advantageous. During the evaluation of such a root, it is assumed that not all of the teeth of the blade root attachment are under mechanical loading.

After operation, the blade root attachment needs to be inspected very critically. Blade root parts, which are indicating defects, need to be rejected immediately.

The proposed idea is to introduce radial and axial slots in the blade root (as depicted in figure 1) which help to prevent the spreading of cracks in such highly loaded components by increasing the blades resistance against mechanical loadings. By doing so, it is possible to allow more deformation within the blade root. In consequence, the softer blade roots increase the contact area between the blade root and disc groove by distributing the mechanical loading to all teeth of the root. The elasticity achieved by the proposed split design is classified through...