Continuous detonation combustion of fuel-air mixtures

Continuous detonation combustion of fuel-air mixtures was performed. In a disk-shaped chamber with a plane radial eddying flow directed from the periphery to the central outlet opening, a rotating detonation wave in which hydrogen, methane, and sprayed liquid fuels (kerosene and diesel fuel) mixed with air were burnt was excited. Previously, a similar process was realized only for fuel-oxygen mixtures. Lavrent’ev Institute of Hydrodynamics, Siberian Division, Russian Academy of Sciences, Novosibirsk 630090. Translated from Fizika Goreniya i Vzryva, Vol. 33, No. 3, pp. 120–131, May–June, 1997.     

Some features of combustion of aluminothermic mixtures

Alma-Ata. Translated from Fizika Goreniya i Vzryva, Vol. 28, No. 1, pp. 46–51, January–February, 1992.     

Gasless combustion in Ti-xSi powder mixtures

Gasless combustion in the Ti-Si system was investigated by high-speed video recording (250 frames per second) followed by frame-by-frame treatment of the records. Steady-state combustion was observed when the combustion temperature, Tc, was above the melting points of Ti and Si. Two different modes of unsteady combustion were found when Tc was higher than the melting point of Si but lower than the melting point of Ti: (1) combined quasi-spinning combustion atTi excess and (2) meso-scintillating combustion at Si excess. The combustion faded when the adiabatic combustion temperature, Tad, became close to a lowest melting point in the system. All of the observed combustion modes can be rationalized in terms of a micro-heterogeneous model. Proposed are the methods for experimental diagnostics of 3D combustion waves inside an opaque sample and distinguishing between truly spinning, quasi-spinning, and other combustions modes.     

The rheodynamics and combustion of coal-water mixtures

Investigation methods for characteristics of movement along the tubes, combustion dynamics and gasification of separate drops were developed for the coal-water mixtures (CWM). The following parameters were determined on the basis of laser heating: thermometric, pyrometric and concentration dynamics of single-drop combustion, complete combustion times, duration of temperature phases of combustion, as well as the moment and temperature of ignition. Information on the combustion mass velocity and gasification products was also obtained using laser heating.     

Theory of nonsteady combustion of metal-free condensed mixtures

Dzerzhinsk. Translated from Fizika Goreniya i Vzryva, Vol. 28, No. 6, pp. 24–32, November–December, 1992.     

Characteristics of combustion and detonation of methane-coal mixtures

Calculated and experimental data on combustion and detonation in mixtures where oxygen or air is used as an oxidizer and methane or coal dust is used as a fuel are presented.     

Explosive model of low-speed combustion of gaseous hydrocarbon-air mixtures

An explosive model is proposed for the calculation of the stationary velocity in mixtures of air and combined fuel consisting of various gaseous hydrocarbons. The required equations are obtained from a consideration of the flame-front structure on the basis of the thermal diffusion theory. In contrast to known relationships, the proposed model does not contain any ambiguities in the equation for the heat-release rate during combustion of hydrocarbons. The calculations were performed for methane-hydrogenair mixtures. The model describes the basic qualitative results of experiments on the steady propagation of laminar combustion and provides acceptable quantitative agreement with the experiments with gaseous hydrocarbons-air mixtures. Translated fromFizika Goreniya i Vzryva, Vol. 34, No. 3, pp. 3–7, May–June, 1998.