Gaseous detonation in different structural ducts

ABSTRACT

This article has reviewed the behavior of gaseous detonation propagated in straight ducts and nonstraight ducts. Detonation limits are extended by low-velocity self-sustaining detonation in narrow gap and roughness pipe of straight ducts, which is caused by instability, while in obstacle-equipped ducts of straight ducts, detonation failure is led by diffraction and detonation reignition is led by reflection. Furthermore, the propagation mechanism of detonation around the obstacle is adopted in bend ducts and branch ducts. The objective of this study is to clarify the detonation behavior in complex structures, through the state of basic theories and typical experiment conclusions.

KEYWORDS:

• Detonation
• roughness
• obstacle
• bend ducts
• branch ducts

Disclosure statement

No potential conflict of interest was reported by the author(s).

Nomenclature

c fuel concentration

c_stfuel concentration in the stoichiometric state

d critical tube diameter

D tube diameter

t time

V detonation velocity

V_CJ velocity of the Chapman-Jouguet state

λdetonation cell size

δwire diameter of the Shchelkin spiral

θwall angle

Highlights

1. The detonation behaviors in complex structural ducts have been reviewed.

2. Failure and reinitiation mechanisms of detonation have been compared in bend and branch ducts.

3. The theoretical basis for the analysis of industrial pipeline explosion has been provided.