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research-article

OH* CHEMILUMINESCENCE IMAGING OF THE COMBUSTION PRODUCTS FROM A METHANE-FUELED ROTATING DETONATION ENGINE

[+] Author and Article Information
Jonathan Tobias

University of Alabama, Tuscaloosa, AL, USA
jrtobias@crimson.ua.edu

Daniel Depperschmidt

University of Alabama, Tuscaloosa, AL, USA
dldepperschmidt@crimson.ua.edu

Cooper Welch

University of Alabama, Tuscaloosa, AL, USA
chwelch@crimson.ua.edu

Robert Miller

University of Alabama, Tuscaloosa, AL, USA
rmiller16@crimson.ua.edu

Mruthunjaya Uddi

University of Alabama, Tuscaloosa, AL, USA
uddi@ua.edu

Dr. Ajay Agrawal

University of Alabama, Tuscaloosa, AL, USA
aagrawal@eng.ua.edu

Ron Daniel Jr

Aerojet-Rocketdyne, Huntsville, AL, USA
Ron.Daniel-Jr@rocket.com

1Corresponding author.

ASME doi:10.1115/1.4041143 History: Received July 03, 2018; Revised July 19, 2018

Abstract

Recent research has shown that rotating detonation combustion (RDC) can provide excellent specific thrust, specific impulse, and pressure gain within a small volume through rapid energy release by continuous detonation in the circumferential direction. The RDC could provide significant efficiency gains for power generating gas turbines in combined cycle power plants. However, few past studies have employed fuels that are relevant to power generation turbines, since RDC research has focused mainly on propulsion applications. In this study, we present experimental results from RDC operated on methane and oxygen-enriched air to represent reactants used in land-based power generation. The RDC is operated at high pressure using a back-pressure plate located downstream of the combustor. Past studies have focused mainly on probe measurements inside the combustor, and thus, little information is known about the nature of the products exiting the RDC. In particular, it is unknown if chemical reactions persist outside the RDC annulus, especially if methane is used as the fuel. In this study, we apply two time-resolved optical techniques to simultaneously image the RDC products at framing rate of 30 kHz: (1) direct visual imaging to identify the overall size and extent of the plume, and (2) OH* chemiluminescence imaging to detect the reaction zones if any. Results show dynamic features of combustion products that are consistent with the probe measurements inside the RDE. Moreover, presence of OH* in the products suggests that oblique shock wave and reactions persist downstream of the RDC.

Copyright (c) 2018 by ASME
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