首页|Experimental study on detonation propagation characteristics of hydrogen-nitrous oxide at stoichiometric and fuel-lean conditions

Experimental study on detonation propagation characteristics of hydrogen-nitrous oxide at stoichiometric and fuel-lean conditions

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  • NETL
  • NSTL
  • Elsevier
Knowledge of detonation propagation characteristics of H_2-N_2O mixtures is crucial for industrial safety and development. In this study, the detonation propagation characteristics of H_2-N_2O mixtures with different equivalence ratios (φ = 0.4, 0.6, and 1.0) in three tubes (d = 14.5, 19.5, and 28.6 mm) were investigated experimentally. Some dominant chemical lengths were evaluated together with cell size and normalized average velocity. The results show that the periodic oscillation of local velocity is more intense as approaching the limits. Below the limits, the detonation fails and decays rapidly to a "low velocity" regime. The tube scale and initial pressure determine the velocity deficit and the minimum detonation velocity shows no obvious trend on the mixture composition and tube scale. Scaling analysis illustrates that the dimensionless parameter d/Δ_I and normalized average velocity show a single exponential growth trend. Notably, the detonation tends to decay earlier φ = 1.0 than φ = 0.4 ox φ = 0.6. Besides, fuel-lean mixtures (φ = 0.4 and 0.6) and stoichiometric mixtures (φ = 1.0) share similar critical pressure. It can be obtained that a linear relationship exists between the cell size and the induction length. The cell size data shows that the cell size of φ = 0.6 is the smallest, which agrees with the results of the induction length calculated. It is also demonstrated that the maximum value of heat release ratio peak is at φ = 0.6.

Critical pressureNitrous oxideVelocity deficitDetonation cell

Tian Ji、Die Chen、Ze He、Hong-Hao Ma、Lu-Qing Wang

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CAS Key Laboratory of Mechanical Behavior and Design 0f Materials (LMBD), Department of Modern Mechanics, Uniuersity of Science and Technology of China, Hefei 230026, Anhui, PR China

CAS Key Laboratory of Mechanical Behavior and Design 0f Materials (LMBD), Department of Modern Mechanics, Uniuersity of Science and Technology of China, Hefei 230026, Anhui, PR China,State Key Laboratory of Fire Science, Uniuersity of Science and Technology of China, Hefei 230026, Anhui, PR China

2022

10.1016/j.ijhydene.2022.06.011

International journal of hydrogen energy

International journal of hydrogen energy

ISTP
ISSN：0360-3199
年,卷(期)：2022.47(61)
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