TY - JOUR
T1 - Acoustic waves in baffled combustion chamber with radial and circumferential blades
AU - You, Danning
AU - Ku, David D.
AU - Yang, Vigor
N1 - Funding Information:
This work was sponsored by the Air Force Office of Scientific Research under Contract No. FA-9550-10-1-0179. The support and encouragement provided by Dr. Mitat A. Birkan is gratefully acknowledged.
PY - 2013
Y1 - 2013
N2 - A linear acoustic analysis has been conducted to study the combustion instability characteristics of threedimensional baffled combustion chambers. The theoretical formulation is based on a generalized wave equation. Normal mode expansion and spatial averaging techniques are implemented to solve for the acoustic motions in the chamber. Several specific effects of radial and circumferential baffles, and the mechanisms by which baffles eliminate combustion instabilities, are presented. Longitudinalization of transverse waves inside baffle compartments, restriction of velocity fluctuations near the injector face, and reduction in oscillation frequency are studied systematically. The effects of mean flow, temperature nonuniformities, and combustion response on the baffle design and stability behaviors are investigated. Potential destabilizing influences of baffles are found to be the concentration of acoustic pressure at the injector face and of acoustic velocity near the baffle tips, as well as their ensuing interactions with local combustion processes.
AB - A linear acoustic analysis has been conducted to study the combustion instability characteristics of threedimensional baffled combustion chambers. The theoretical formulation is based on a generalized wave equation. Normal mode expansion and spatial averaging techniques are implemented to solve for the acoustic motions in the chamber. Several specific effects of radial and circumferential baffles, and the mechanisms by which baffles eliminate combustion instabilities, are presented. Longitudinalization of transverse waves inside baffle compartments, restriction of velocity fluctuations near the injector face, and reduction in oscillation frequency are studied systematically. The effects of mean flow, temperature nonuniformities, and combustion response on the baffle design and stability behaviors are investigated. Potential destabilizing influences of baffles are found to be the concentration of acoustic pressure at the injector face and of acoustic velocity near the baffle tips, as well as their ensuing interactions with local combustion processes.
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U2 - 10.2514/1.B34923
DO - 10.2514/1.B34923
M3 - Article
AN - SCOPUS:84892581432
VL - 29
SP - 1453
EP - 1467
JO - Journal of Propulsion and Power
JF - Journal of Propulsion and Power
SN - 0748-4658
IS - 6
ER -