TY - JOUR
T1 - Investigation of combustion modes and pressure of reflective shuttling detonation combustor
AU - Yamaguchi, Masato
AU - Taguchi, Tomoya
AU - Matsuoka, Ken
AU - Kawasaki, Akira
AU - Kasahara, Jiro
AU - Watanabe, Hiroaki
AU - Matsuo, Akiko
N1 - Funding Information:
This work was subsidized by a JSPS KAKENHI Grant Number JP17H04971 (Grant-in-Aid for Young Scientists (A)) and JP18KK0404 (Fostering Joint International Research (A)).
Publisher Copyright:
© 2021 Elsevier Ltd. All rights reserved.
PY - 2021
Y1 - 2021
N2 - Detonation combustors are considered promising alternatives to conventional combustors because they offer high thermal efficiency and fast combustion. However, especially for the rotating detonation combustor, the theoretical propulsive performance has not been confirmed in experimental studies because the highly unsteady flow field hinders the measurements process. To understand the involved phenomena in more detail, a reflective shuttling detonation combustor (RSDC) with a rectangular combustion chamber was developed. The interior of the chamber can easily be visualized owing to its two-dimensional quality. Utilizing the RSDC, several combustion tests with gaseous ethylene and oxygen were conducted for different values of mass flow rates and equivalence ratios. Combustion modes from the tests were classified into four types based on the fast Fourier transform (FFT) analysis of the luminous intensity of the CH∗self-luminescence images captured by a high-speed camera and a band pass filter. Simultaneously, the theoretical total pressure of a conventional isobaric combustor was compared to the static pressure measured at the bottom of the RSDC chamber. For the detonation modes, the ratio between experimentally measured static pressure and the theoretical pressure varied depending on the location in the chamber owing to the distribution of the time-averaged static pressure. Furthermore, the pressure ratio of the detonation modes was up to 18% lower than that of the deflagration mode potentially owing to the flow velocity induced by the detonation waves.
AB - Detonation combustors are considered promising alternatives to conventional combustors because they offer high thermal efficiency and fast combustion. However, especially for the rotating detonation combustor, the theoretical propulsive performance has not been confirmed in experimental studies because the highly unsteady flow field hinders the measurements process. To understand the involved phenomena in more detail, a reflective shuttling detonation combustor (RSDC) with a rectangular combustion chamber was developed. The interior of the chamber can easily be visualized owing to its two-dimensional quality. Utilizing the RSDC, several combustion tests with gaseous ethylene and oxygen were conducted for different values of mass flow rates and equivalence ratios. Combustion modes from the tests were classified into four types based on the fast Fourier transform (FFT) analysis of the luminous intensity of the CH∗self-luminescence images captured by a high-speed camera and a band pass filter. Simultaneously, the theoretical total pressure of a conventional isobaric combustor was compared to the static pressure measured at the bottom of the RSDC chamber. For the detonation modes, the ratio between experimentally measured static pressure and the theoretical pressure varied depending on the location in the chamber owing to the distribution of the time-averaged static pressure. Furthermore, the pressure ratio of the detonation modes was up to 18% lower than that of the deflagration mode potentially owing to the flow velocity induced by the detonation waves.
KW - Combustion mode
KW - Fast fourier transform
KW - RSDC
KW - Reflective shuttling detonation combustor
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U2 - 10.1016/j.proci.2020.07.064
DO - 10.1016/j.proci.2020.07.064
M3 - Conference article
AN - SCOPUS:85091477408
SN - 1540-7489
VL - 38
SP - 3615
EP - 3622
JO - Proceedings of the Combustion Institute
JF - Proceedings of the Combustion Institute
IS - 3
T2 - 38th International Symposium on Combustion, 2021
Y2 - 24 January 2021 through 29 January 2021
ER -