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Vol 481, No 2 (2018)
- Year: 2018
- Articles: 4
- URL: https://journals.rcsi.science/0012-5016/issue/view/9246
Physical Chemistry
Rocket Engine with Continuous Film Detonation of Liquid Fuel
Abstract
It was experimentally proven for the first time that it is possible to perform continuous detonation combustion of a film of a liquid fuel in the annular combustor of a demonstrator of a liquid-fuel detonation rocket engine. Firing tests revealed a near-limit mode of longitudinally pulsating film detonation and modes of continuous spinning film detonation with one and two detonation waves circulating within the annular gap of the combustor.
105-109
Effect of Small Additions of Alumina Nanoparticles on the Strength Characteristics of an Aluminum Material
Abstract
New data were obtained on the effect of small additions of nanoparticles on the mechanical properties of a metal matrix produced by cold pressing of powders with subsequent sintering in a forevacuum. The matrix was a sintered aluminum powder or aluminum–1.5 vol % copper powder mixture. The strengthener was alumina nanoparticles at concentrations of 0.01–0.15 vol %. It was shown that the strength characteristics of these materials as determined by tensile, compressive, and flexural testing and by the offset yield strength method are significantly higher.
110-113
Physicochemical Processes Accompanying the Plastic Strain Localization under Pulsed Loading
Abstract
The formation of localized deformation bands is accompanied by the mass transfer of particles of the matrix material (interstitial atoms, impurities, etc.) toward faults in the material being destroyed and by the emergence of stress oscillations in a mode of ultrasonic vibrations lasting several orders of magnitude longer than the initial pulse. It was assumed that dislocations generated under pulsed deformation are the cause of the migration of particles.
114-116
Thermocycle and Evolutionary Combinatorics in the Genesis and Evolution of Protobiopolymers. Basic Kinetic Principles
Abstract
The basic kinetic principles of genesis and evolution of protobiopolymeric molecules are discussed. An approach combining polymerization and selection of macromolecular structures is the thermocycle providing the thermodynamic feasibility of formation of the monomer–monomer bond and kinetic selection of structures by picking more regular complexes. The basic kinetic principle of the successful evolutionary process is formulated as follows: the systems win if the mechanism of their development involves exponential growth steps.
117-120