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CONCENTRATION AND VELOCITY FIELDSTHROUGHOUT THE FLOW FIELD OF SWIRLING FLOWS IN GAS TURBINE MIXERS

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Date Issued:
2004
Abstract/Description:
Air velocity and fuel concentration data have been collected throughout the flow fields of two gas turbine mixers in an effort to better understand the mixing of fuel and air in gas turbine mixers. The two gas turbine mixers consisted of an annular flow profile and incorporated swirl vanes to produce a swirling flow to promote fuel/air mixing. The fuel was injected into the bulk flow from the pressure side of the swirl vanes. The first mixer had a swirl angle of 45o, while the second had a swirl angle of 55o. In order to examine the effect of the swirl angle on the mixing of fuel and air as the flow progressed through gas turbine mixers, axial and tangential air velocity data was taken using a laser Doppler velocimeter (LDV). Also, fuel concentration data was taken separately using a hydrocarbon concentration probe with methane diluted with air as the fuel. The data were taken at varying axial and varying angular locations in an effort to capture the spatial development of the fuel and velocity profiles. The spectra of the data were analyzed as well in an effort to understand the turbulence of the flow. It was found that the 55o swirler exhibited smaller variations in both velocity and fuel concentration values and that the fuel reached a uniform concentration at axial locations further upstream in the 55o degree mixer than in the 45o mixer. The RMS values of the velocity, which were influenced by the swirl vanes, were higher in the 55o mixer and likely contributed to the better mixing performance of the 55o mixer. The fuel concentration spectrum data showed that the spectra of the two mixers were similar, and that the fluctuations in fuel concentration due to flow emanating from the swirl vanes were seen throughout the length of the two mixers.
Title: CONCENTRATION AND VELOCITY FIELDSTHROUGHOUT THE FLOW FIELD OF SWIRLING FLOWS IN GAS TURBINE MIXERS.
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Name(s): Turek, Louis James, Author
Chen, Ruey-Hung, Committee Chair
University of Central Florida, Degree Grantor
Type of Resource: text
Date Issued: 2004
Publisher: University of Central Florida
Language(s): English
Abstract/Description: Air velocity and fuel concentration data have been collected throughout the flow fields of two gas turbine mixers in an effort to better understand the mixing of fuel and air in gas turbine mixers. The two gas turbine mixers consisted of an annular flow profile and incorporated swirl vanes to produce a swirling flow to promote fuel/air mixing. The fuel was injected into the bulk flow from the pressure side of the swirl vanes. The first mixer had a swirl angle of 45o, while the second had a swirl angle of 55o. In order to examine the effect of the swirl angle on the mixing of fuel and air as the flow progressed through gas turbine mixers, axial and tangential air velocity data was taken using a laser Doppler velocimeter (LDV). Also, fuel concentration data was taken separately using a hydrocarbon concentration probe with methane diluted with air as the fuel. The data were taken at varying axial and varying angular locations in an effort to capture the spatial development of the fuel and velocity profiles. The spectra of the data were analyzed as well in an effort to understand the turbulence of the flow. It was found that the 55o swirler exhibited smaller variations in both velocity and fuel concentration values and that the fuel reached a uniform concentration at axial locations further upstream in the 55o degree mixer than in the 45o mixer. The RMS values of the velocity, which were influenced by the swirl vanes, were higher in the 55o mixer and likely contributed to the better mixing performance of the 55o mixer. The fuel concentration spectrum data showed that the spectra of the two mixers were similar, and that the fluctuations in fuel concentration due to flow emanating from the swirl vanes were seen throughout the length of the two mixers.
Identifier: CFE0000078 (IID), ucf:46098 (fedora)
Note(s): 2004-08-01
Ph.D.
College of Engineering and Computer Science, Department of Mechanical, Materials, and Aerospace Engineering
This record was generated from author submitted information.
Subject(s): gas turbine mixers
unmixedness
fuel concentration
swirl
velocity
Persistent Link to This Record: http://purl.flvc.org/ucf/fd/CFE0000078
Restrictions on Access: public
Host Institution: UCF

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