1. Experimental study on the equivalence ratio effects in ammonia–hydrogen–air premixed gas duct-vented explosions.
- Author
-
Zhu, Wenyan, Wang, Quan, Li, Rui, Yang, Rui, Ge, Yu, Feng, Dingyu, Xu, Jianshe, and Yang, Yaoyong
- Subjects
- *
GAS explosions , *COMBUSTION , *EXPLOSIONS , *AMMONIA , *MIXTURES , *FLAME , *HYDROGEN flames - Abstract
To explore the combustion characteristics of ammonia‒hydrogen‒air flame, explosion venting experiments of ammonia‒hydrogen‒air mixtures with different equivalence ratios (ϕ), in the range of 0.6–1.7, are carried out in a 2 m long duct. The results show that the pressure‒time histories inside the duct have a three-peak structure (P b , P out , and P ext), which is caused by the burst of the vent cover, venting of burned mixtures, and counterflow flame generated by the external explosion, respectively. P out evolves into three pressure peak types with increasing ϕ. The pressure peak value P e is generated at the pressure measuring point outside the duct because of the external explosion. The change in P e with ϕ is consistent with P out and P ext , all of which increase first and then decrease with increasing ϕ and reach a maximum value at ϕ = 1.3. This study provides basic theoretical support for the promotion and application of ammonia mixed fuel. • The effects of the equivalence ratio, ϕ , on duct-vented ammonia‒hydrogen‒air deflagration were studied. • Counterflow flame generated by the external explosion was observed in all experiments. • The pressure‒time histories inside the duct under each operating condition present had a three-peak structure. • The maximum overpressure inside and outside duct first increased and thereafter decreased. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF