TY - JOUR
T1 - Effects of confinement on detonation in H2–O2 mixture with transverse concentration gradient
AU - Chen, Qiang
AU - Huang, Jin
AU - Lei, Gang
AU - Wang, Tianxiang
AU - Chen, Jinliang
AU - Han, Wenhu
N1 - Publisher Copyright:
© 2023 Hydrogen Energy Publications LLC
PY - 2023/6/5
Y1 - 2023/6/5
N2 - Since hydrogen has wide flammability limit and low ignition energy, it could be easily ignited and be easy for the transition to a detonation, leading to extremely serious impacts in explosion accidents or extremely high combustion effeciency in the propulsion. In the field of explosion accidents and the combustion chamber of propulsion systems, hydrogen mixtures are more likely to be highly non-uniform and a detonation usually propagates in a non-homogeneous medium. The work studies behaviors of detonations in non-homogenous medium by a high-resolution simulations. We widen computational domain and steepen the gradient to weaken the role of transverse wave on cellular detonations propagating in the medium with transverse concentration gradient and to reveal the interaction of longitudinal shock with reaction wave. The results show that characteristics of detonations in nonuniform medium is controlled by coupling role of gradient and confinement. As a domain is sufficient wide, the reflection wave is rather weak so that the detonation takes on galloping propagation, with a single-head mode. As the width is mediate, detonation cell takes on highly irregularity, similar to that of highly unstable detonation. However, in the narrow domain, steepening gradient plays a key role while confinement becomes minor in detonation propagation.
AB - Since hydrogen has wide flammability limit and low ignition energy, it could be easily ignited and be easy for the transition to a detonation, leading to extremely serious impacts in explosion accidents or extremely high combustion effeciency in the propulsion. In the field of explosion accidents and the combustion chamber of propulsion systems, hydrogen mixtures are more likely to be highly non-uniform and a detonation usually propagates in a non-homogeneous medium. The work studies behaviors of detonations in non-homogenous medium by a high-resolution simulations. We widen computational domain and steepen the gradient to weaken the role of transverse wave on cellular detonations propagating in the medium with transverse concentration gradient and to reveal the interaction of longitudinal shock with reaction wave. The results show that characteristics of detonations in nonuniform medium is controlled by coupling role of gradient and confinement. As a domain is sufficient wide, the reflection wave is rather weak so that the detonation takes on galloping propagation, with a single-head mode. As the width is mediate, detonation cell takes on highly irregularity, similar to that of highly unstable detonation. However, in the narrow domain, steepening gradient plays a key role while confinement becomes minor in detonation propagation.
KW - Concentration gradient
KW - Detonation
KW - Hydrogen
UR - http://www.scopus.com/inward/record.url?scp=85150362040&partnerID=8YFLogxK
U2 - 10.1016/j.ijhydene.2023.01.216
DO - 10.1016/j.ijhydene.2023.01.216
M3 - Article
AN - SCOPUS:85150362040
SN - 0360-3199
VL - 48
SP - 18486
EP - 18497
JO - International Journal of Hydrogen Energy
JF - International Journal of Hydrogen Energy
IS - 48
ER -