Abstract

Stationary power generating gas turbines are held to strict emissions standards that limit efficiency and power output. Dry low NOx combustors are being designed to limit NOx emissions while simultaneously improving efficiency. Axially staged combustors are leveraged to reduce emissions by staging heat release into separate stages. This is done by splitting some fuel and air to a downstream axial stage that is closer to the combustor exit. In this stage, the residence time is decreased allowing for optimal turbine inlet temperatures with improved emissions. The current thesis focuses on the downstream reacting jet-in-crossflow at power generating gas turbine relevant conditions. The experimental facility consists of a headend burner which provides a vitiated crossflow at various conditions for the axial stage. The headend burner consists of a concentric dump style combustor that is used to stabilize a lean methane-air flame. Downstream of the vitiator is the test section which consists of 3 optical viewing ports for imaging diagnostics and an interchangeable injector plate to study different jet geometries. The current work investigates a 4 mm diffusion jet, a 0.5 in fully premixed jet, 0.5 in partially premixed jet, and a 0.5 in fully premixed jet. Particle Image Velocimetry (PIV) is utilized to obtain flow-field characteristics, and CH* chemiluminescence is used to visualize flame behavior. Additionally, a Horiba gas analyzer is used to obtain emissions measurements for various run conditions. Various flames are observed for the different conditions ran, and emissions measurements show axially staging benefits at full load gas turbine conditions.

Notes

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Graduation Date

2020

Semester

Spring

Advisor

Ahmed, Kareem

Degree

Master of Science in Aerospace Engineering (M.S.A.E.)

College

College of Engineering and Computer Science

Department

Mechanical and Aerospace Engineering

Degree Program

Aerospace Engineering; Thermofluid Aerodynamic Systems Track

Format

application/pdf

Identifier

CFE0007956; DP0023097

URL

https://purls.library.ucf.edu/go/DP0023097

Language

English

Release Date

May 2025

Length of Campus-only Access

5 years

Access Status

Masters Thesis (Campus-only Access)

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Restricted to the UCF community until May 2025; it will then be open access.

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