Abstract The advantages of a constant volume combustion cycle as compared to constant pressure combustion in terms of thermodynamic efficiency has focused the search for advanced propulsion on detonation engines. Detonation of acetylene mixed with oxygen in various proportions is studied using mathematical modeling. Simplified kinetics of acetylene burning includes 11 reactions with 9 components. Deflagration to detonation transition (DDT) is obtained in a cylindrical tube with a section of obstacles modeling a Shchelkin spiral; the DDT takes place in this section for a wide range of initial mixture compositions. A modified ka-omega turbulence model is used to simulate flame acceleration in the Shchelkin spiral section of the system. The results of numerical simulations were compared with experiments, which had been performed in the same size detonation chamber and turbulent spiral ring section, and with theoretical data on the Chapman–Jouguet detonation parameters.
Highlights Detonation onset in engine fed by acetylene–oxygen was studied experimentally and numerically. Detonation onset takes place in the unburned pocket of gas surrounded by hot reaction products. DDT scenarios depend on the mixture equivalence ratio. Experimental and numerical results are in good agreement for the equivalence ratios .
Detonation engine fed by acetylene–oxygen mixture
Acta Astronautica ; 104 , 1 ; 134-146
2014-07-11
13 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Detonation engine fed by acetylene–oxygen mixture
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