Date of Award

Spring 2014

Degree Type

Thesis

Degree Name

Master of Science (MS)

Department

Mechanical Engineering

First Advisor

Jay P. Gore

Committee Member 1

Robert P. Lucht

Committee Member 2

Li Qiao

Abstract

Quantitative imaging of radiation intensity (QIRI) is a method of investigating temporally and spatially resolved radiation from species and particulates in turbulent flames. The current study reports quantitative images of radiation intensity from a turbulent ethylene flame that matches the Reynolds number (15,200) of a non-sooting flame from the International Workshop on Measurement and Computation of Turbulent Non-premixed Flames. A calibrated high-speed infrared camera with four band-pass filters was used to acquire images of radiation intensity in wavelengths corresponding to carbon dioxide, water vapor, and soot. The luminous flame measurements show thin radiating structures corresponding to soot layers and higher mean and fluctuating radiation intensities compared to quantitative images of radiation intensity from a non-sooting flame. For centerline locations downstream of initial soot radiation detection, the temporal autocorrelation of radiation from soot approaches zero more rapidly than radiation from carbon dioxide. The normalized probability density functions indicate that the PDF of soot radiation is skewed towards higher intensities while the PDF of carbon dioxide radiation is skewed towards lower intensities. Images of computed radiation intensity from LES are also presented with a discussion of validation using experiments.

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