Browse Prior Art Database

Elastic Spring as a vibration damper

IP.com Disclosure Number: IPCOM000248813D
Publication Date: 2017-Jan-12
Document File: 3 page(s) / 510K

Publishing Venue

The IP.com Prior Art Database

Abstract

Fuel flexibility and low emissions are the key developmental areas for Heavy duty Gas Turbine Combustion systems. Such developments involve complex shaped fuel nozzle assembly. Designing such fuel nozzles is the key challenge as combustors operate in vibratory environment arising due to combustion dynamics pressure and rotor imbalance force. The structural vibration leads to high cycle fatigue and wear out of contact interfaces, thus limiting hardware durability and reducing mean time between maintenance. Fuel nozzles are to be designed to provide enough separation margins between its natural frequencies and the potential forcing functions, and with enough damping to limit vibratory response during operation. The proposed invention aims to limit vibration of gas turbine fuel nozzle assembly by providing spring-damper arrangement. The proposed spring-damper arrangement enables to tune fuel nozzle natural frequency along with increased frictional damping, thus improving HCF and wear out capability.

This text was extracted from a Microsoft Word document.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 53% of the total text.

Elastic Spring as a vibration damper

BACKGROUND

Fuel flexibility and low emissions are the key developmental areas for Heavy duty Gas Turbine Combustion systems.  Such developments involve complex shaped fuel nozzle assembly. Designing such fuel nozzles is the key challenge as combustors operate in vibratory environment arising due to combustion dynamics pressure and rotor imbalance force. The structural vibration leads to high cycle fatigue and wear out of contact interfaces, thus limiting hardware durability and reducing mean time between maintenance. Fuel nozzles are to be designed to provide enough separation margins between its natural frequencies and the potential forcing functions, and with enough damping to limit vibratory response during operation.

The proposed invention aims to limit vibration of gas turbine fuel nozzle assembly by providing spring-damper arrangement. The proposed spring-damper arrangement enables to tune fuel nozzle natural frequency along with increased frictional damping, thus improving HCF and wear out capability.

DESCRIPTION

This invention proposes a conical elastic spring that serves as a vibration damper. The elastic spring is attached to one tube, and is pre-loaded against another tube with a spherical mating surface. Schematic of the proposed spring-damper arrangement is shown in Figure 1. Spring-dampers in a Fuel Nozzle assembly with concentric tubes for different flow medium is shown in Figure 1(a). The flow medium can be gas fuel, liquid fuel, and air.  Three combinations of damper positions are shown in Figure 1(b).

Spring-damper arrangement in this invention has conical shape with a...