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- 저자 : V. F. Nikitin (검색결과 2 건)
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Detonation engine fed by acetylene-oxygen mixture
Smirnov, N.N.,Betelin, V.B.,Nikitin, V.F.,Phylippov, Yu.G.,Koo, J. Pergamon Press 2014 Acta astronautica Vol.104 No.1
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.
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On One Problem of Fracture Propagation in an Ice Layer
V. F. Nikitin,안정선,A. B. Kiselev,N. N. Smirnov,이귀주 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.54 No.2
The paper is aimed at developing a model for one of many possible ice - breaking scenarios. For a relatively thin ice layer, the pressure of the leading wedge of the ship initiates tensile stresses in the horizontal plane of the ice cover. When the tensile stresses surpass a definite critical value, fracture propagationstarts in a brittle medium, beginning from the tip of the wedge. The model of damageable thermoviscoelastic media is used to describe the flat ice cover. The problem of crack propagation in the ice cover was solved numerically using by the developed model.
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