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Characterization of Combustion Dynam...

Weber, Matthew.

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Characterization of Combustion Dynamics in a Liquid Model Gas Turbine Combustor under Fuel-Rich Conditions.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Characterization of Combustion Dynamics in a Liquid Model Gas Turbine Combustor under Fuel-Rich Conditions./
Author:	Weber, Matthew.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2019,
Description:	90 p.
Notes:	Source: Masters Abstracts International, Volume: 81-06.
Contained By:	Masters Abstracts International81-06.
Subject:	Aerospace engineering. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=27712144
ISBN:	9781392443835

Characterization of Combustion Dynamics in a Liquid Model Gas Turbine Combustor under Fuel-Rich Conditions.
Weber, Matthew.

Characterization of Combustion Dynamics in a Liquid Model Gas Turbine Combustor under Fuel-Rich Conditions. - Ann Arbor : ProQuest Dissertations & Theses, 2019 - 90 p.

Source: Masters Abstracts International, Volume: 81-06.

Thesis (M.S.)--University of Cincinnati, 2019.

This item must not be sold to any third party vendors.

This research provides an experimental investigation into the behavior of naturally occurring, fuel-rich, unstable combustion of liquid fuel in a gas turbine combustor. Testing was done using an acoustically isolated single nozzle combustion test rig using liquid Jet-A fuel, capable of operating under unstable combustion conditions. A test matrix was established to identify operating conditions that incited high combustion instability in fuel-rich conditions. The pressure and flame intensity emissions were analyzed across the test matrix in both time and frequency domains. The Rayleigh Criterion was applied to identify the presence of thermo-acoustic instabilities using combustor pressure and flame emission fluctuations. The flame response was established to further characterize the flame dynamics using using the combustor velocity and flame emission fluctuations. Periodic flame structure and behavior was determined using a high speed camera and compared to the convection time delays calculated via flame emission measurements. The investigation concluded that for cases with sufficiently high pressure fluctuations, the Rayleigh Criterion identified thermo-acoustic instability in fuel-rich combustion. The high-speed video and flame emission measurements revealed the spatial and temporal characteristics of emissions in the OH*-band, indicating that it serves as the best approximation for heat release in a fuel-rich flame. Additionally, the high speed camera video and flame emission measurements indicated that CH*-band emissions convectively lag OH*-band emissions.

ISBN: 9781392443835Subjects--Topical Terms:

1002622
Aerospace engineering.
Subjects--Index Terms:

Fuel-rich combustion

Characterization of Combustion Dynamics in a Liquid Model Gas Turbine Combustor under Fuel-Rich Conditions.
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506 $a This item must not be sold to any third party vendors.
520 $a This research provides an experimental investigation into the behavior of naturally occurring, fuel-rich, unstable combustion of liquid fuel in a gas turbine combustor. Testing was done using an acoustically isolated single nozzle combustion test rig using liquid Jet-A fuel, capable of operating under unstable combustion conditions. A test matrix was established to identify operating conditions that incited high combustion instability in fuel-rich conditions. The pressure and flame intensity emissions were analyzed across the test matrix in both time and frequency domains. The Rayleigh Criterion was applied to identify the presence of thermo-acoustic instabilities using combustor pressure and flame emission fluctuations. The flame response was established to further characterize the flame dynamics using using the combustor velocity and flame emission fluctuations. Periodic flame structure and behavior was determined using a high speed camera and compared to the convection time delays calculated via flame emission measurements. The investigation concluded that for cases with sufficiently high pressure fluctuations, the Rayleigh Criterion identified thermo-acoustic instability in fuel-rich combustion. The high-speed video and flame emission measurements revealed the spatial and temporal characteristics of emissions in the OH*-band, indicating that it serves as the best approximation for heat release in a fuel-rich flame. Additionally, the high speed camera video and flame emission measurements indicated that CH*-band emissions convectively lag OH*-band emissions.
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653 $a Combustion instability
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