Silencer

Abstract

In a silencer (1) for a flow passage (2) of a turbomachine, in particular of a power plant, a plurality of walls (2) are arranged in the flow passage (3), extend parallel to a gas flow (4) directed in the flow passage (3), and are spaced apart transversely to the direction of the gas flow (4). The walls (2) are designed so as to absorb airborne noise. In order to reduce the vibration tendency of the walls (2), at least one of these walls (2) is provided with at least one connecting passage (9) which passes completely through the wall (2) transversely to the direction of flow.

Description

[0001] This application claims priority under 35 U.S.C. § 119 to Swiss application number No. 00955 / 05, filed 7 Jun. 2005, the entirety of which is incorporated by reference herein. BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] The invention relates to a silencer for a flow passage of a turbomachine, in particular of a power plant. [0004] 2. Brief Description of the Related Art [0005] A turbomachine, such as, for example, a turbine or a compressor of a turboset, in particular of a power plant, can develop disturbing noises during operation. These noises can spread into the environment of the turbomachine through the flow passages of the turbomachine, which, for example, feed fresh air to the compressor or discharge exhaust gases from the turbine. In order to reduce the noise emission into the environment, it is conventional practice to arrange a silencer of the aforementioned type in the flow passage. Such a silencer normally has a plurality of walls which are ...

AI Technical Summary

Benefits of technology

[0009] Another aspect of the present invention generally includes providing the walls with connecting passages which pass through the walls transversely to the direction of flow. At each wall, the two outer sides facing away from one another and exposed to the gas flow are connected to one another in a communicating manner by these connecting passages. In this way, pressure differences between these two outer sides can be balanced through the connecting passages. In this case, the invention uses the knowledge that the vibration excitation of the respective wall can be attributed to pressure differences at their outer sides. The driving force for the vibration excitation of the walls is reduced by balancing these pressure differences. As a result, the vibration excitation and vibration tendency of the walls also decreases.

Problems solved by technology

A turbomachine, such as, for example, a turbine or a compressor of a turboset, in particular of a power plant, can develop disturbing noises during operation.

As a result, airborne noise which spreads within the gas flow in the flow passage is correspondingly damped when passing through the silencer.

As a result, firstly the airborne-noise permeability of the outer skin may be impaired.

Secondly, the damping capacity of the damper material may be impaired.

These vibrations of the walls are transmitted to the respective flow passage, so that an increasing vibration tendency of the walls puts the reliable operation of the turbomachine at risk.

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