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Online Deformation Measurement System for Turbo Machinery Outer Casings

IP.com Disclosure Number: IPCOM000210689D
Original Publication Date: 2011-Sep-08
Included in the Prior Art Database: 2011-Sep-08
Document File: 2 page(s) / 124K

Publishing Venue

Siemens

Related People

Juergen Carstens: CONTACT

Abstract

Any uniform or non-uniform deformation in a turbo machine’s casing, especially during transient operation, such as start-up or shut-down, implies a loss of efficiency and could cause material damage. The latter is caused by possible gap size alterations between the turbo machine’s casing and e.g. blades positioned on the machine’s rotor. However, defined limits which are based on e.g. safety and efficiency considerations can prevent damages if a turbo machine’s casing deformation could not be monitored sufficiently.

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Online Deformation Measurement System for Turbo Machinery Outer Casings

Idea: Schmitz Sebastian, Mülheim a.d. Ruhr; Dr. Sohail Ahmed, Mülheim a.d. Ruhr; Marcel
Zwingenberg, Mülheim a.d. Ruhr; Dr. Harald Harders, Mülheim a.d. Ruhr

Any uniform or non-uniform deformation in a turbo machine's casing, especially during transient operation, such as start-up or shut-down, implies a loss of efficiency and could cause material damage. The latter is caused by possible gap size alterations between the turbo machine's casing and e.g. blades positioned on the machine's rotor. However, defined limits which are based on e.g. safety and efficiency considerations can prevent damages if a turbo machine's casing deformation could not be monitored sufficiently.

In state of the art systems the uniform or non-uniform deformation of a turbo machine's casing is not measured during online operation. Thus, design principles like relatively large radial clearances between e.g. rotor blades and casing are used to ensure a safe and reliable operation of a turbo machine. However, these measures are taken despite the loss of efficiency. Furthermore, advanced calculation methodologies are known which can be used to estimate the deformation of a turbo machine casing in various critical locations. But these calculation methodologies are not suitable for real-time operations due to time and computational limits. Thus, they can not be used for interactions with a turbo machine's control system.

In the following a novel method for continuously measuring the deformations of critical positions on a turbo machine's casing is proposed, which can be applied while the machine is under operating conditions. Thus, allowing for the measurements to be taken as input for the control system of the turbo machine. It is proposed to implement one radial ring type assembly per critical casing position outside the insulation of the turbo machine's casing. This ring, which has a fixed position compared to the turbo machine, is then connect...