# A V Trotsyuk's research while affiliated with Russian Academy of Sciences and other places

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## Publications (39)

A generalized two-stage model of the chemical kinetics of detonation combustion of a dual-fuel stoichiometric gas
mixture of methane-hydrogen-air is proposed. It allows to calculate the molar mass and internal energy of a mixture
without calculating its detailed chemical composition. A two-dimensional numerical calculation of the cellular multifron...

Numerical simulation of continuously rotating detonations of stoichiometric two-fuel mixture with air has been carried out for the cylindrical annular detonation chamber (DC) of the rocket-type engine. The syngas (1-α)СO+αH2, a binary mixture of hydrogen H 2 and carbon monoxide CO, is taken. We studied the global flow structure in DC, and the detai...

A numerical simulation of a two-dimensional (2D) structure of the detonation wave (DW) in a two-fuel gaseous mixtures with air mixture at normal initial condition has been conducted. This study is based on a two-stage generalised model of detonation kinetics for a mixtures of two fuels first proposed by us. The computations have been performed in a...

The numerical simulation of a two-dimensional multi-front structure of detonation waves (DWs) in two-fuel mixtures has been carried out. These studies are based on the proposed two-stage generalized model of chemical kinetics of detonation combustion of a two-fuel mixture: hydrogen and carbon monoxide (synthesis gas) with an oxidizer. This kinetics...

A two-stage reduced model of chemical kinetics of detonation combustion of a mixture of two fuels, i.e., hydrogen and carbon oxide (syngas), with an oxidizer is proposed. Based on this model, a two-dimensional numerical simulation of the parameters of an irregular cellular structure of the detonation wave in the considered binary mixture of two fue...

Two-step reduced model of chemical kinetics of detonation combustion of methane mixtures is presented. The possibility of condensed carbon (soot) microparticles formation in reaction products is taken into account for the first time. The model is simple (only one ordinary differential equation in a main heat release zone) and physically grounded. I...

The flow structure for various detonation regimes is numerically studied in a new flow-type supersonic annular detonation combustor. In the combustor with a new design, detonation burning of the reacting mixture is organized by using a compression body, shaped as a continuous monofilar helix with a constant pitch angle. Numerical simulations are pe...

Two-step approximate models of chemical kinetics of detonation combustion of (i) one-fuel (CH4/air) and (ii) multi-fuel gaseous mixtures (CH4/H2/air and CH4/CO/air) are developed for the first time. The models for multi-fuel mixtures are proposed for the first time. Owing to the simplicity and high accuracy, the models can be used in multi-dimensio...

A numerical simulations of a two-dimensional multi-front irregular structure of the detonation wave (DW) in methane-based mixtures at normal initial condition have been conducted. The computations have been performed in a wide range of channel height. From the analysis of the flow structure and the number of primary transverse waves in channel, the...

A new supersonic flow-type annular detonation combustor is designed in which steady oblique detonation waves in the channel are generated using a compression body in the form of a solid single-wound spiral with a constant pitch angle. A two-dimensional unsteady mathematical model of the reacting flow in this device is formulated. The flow dynamics...

Possible scenarios of ignition and explosion development in coal mines are discussed. A principal possibility of complete quenching of detonation and combustion with the use of a sheet consisting of inert particles is experimentally demonstrated. As the detonation quenching process is rather complicated, it is recommended to focus the attention at...

Theory of strong blast was used as the basis for the experimental method of determining of the energy of source which provides the initiation of combustible mixture. For mono-fuel mixtures the following parameters were experimentally determined at testing: the critical initiation energy of a cylindrical detonation wave in mixtures 2H2+O2 and C2H2+2...

A numerical simulation of a two-dimensional structure of the detonation wave (DW) in a rich (equivalence ratio =1.5) methane-air mixture at normal initial condition has been conducted. The computations have been performed in a wide range of channel heights. From the analysis of the flow structure and the number of primary transverse waves in the ch...

The basic results of experimental investigations on reinitiation processes in diffracting multifront detonation wave (DW) are discussed in connection with problem of practical application of new ecological technology for worn-out tire destruction, where the cooled worn-out tire destroys with the help of gaseous detonation. The experimental results...

This paper presents the experimental data on damping of a detonation wave (DW) in dusty methane-oxygen-nitrogen mixtures and on determination of the critical parameters of the heterogeneous medium that provide complete suppression of the DW and flame propagation. The experiments were carried out in a vertical tube of length L=7 m and diameter d=70...

A two-stage model of the kinetics of detonation combustion of methane in mixtures with an oxygen and air has been developed. The proposed model of the kinetics of detonation combustion of methane appears to be reasonably accurate within the confines of the assumptions and is consistent with the second law of thermodynamics. Constants of the model h...

The method of gaseous detonation wave control and suppression by chemically inert microparticles injection is considered. Parameters of a steady detonation wave and relative detonation cell size in a CH 4 + 2O 2 + N 2 mixture with chemically inert microparticles (SiO 2) are calculated. The influence of initial pressure on the efficiency of the gase...

The possibility of existence of two-scale (bifurcation) structures of detonation in ammonia-oxygen, ammonia-air, and ammonia-nitrous
oxide mixtures with wide-range variations of the initial parameters is analyzed. It is established that ammonia-oxygen mixtures
are characterized by a classical irregular structure. Bifurcation properties are manifest...

The effect of a plane obstacle located normally in front of a detonation tube exit on critical conditions of detonation diffraction is experimentally studied for a stoichiometric C 2 H 2 /O 2 mixture. The results not only complement the data base obtained by Murray and Lee (1983) and Vasil'ev et al. (2003) but provide perfect records of detonation...

An approximate two-stage kinetic model of the chemical reaction in hydrogen-oxygen mixtures containing hydrogen peroxide, water, and inert diluents is developed. The model includes one differential equation for the calculation of the molar mass of the gas after the induction period and algebraic formulas for the calculation of the heat release, int...

Results of experimental and modeling studies of multifront gaseous detonation waves (DW) are reported. In particular the effect of chemistry is studied in the case of H2/O2/Ar mixtures with hydrogen peroxide (H2O2) as additive. Experimental results on the variation of detonation cell size with initial composition and pressure are reported. Modeling...

In studying the detonation phenomenon in gas mixtures, much attention is traditionally paid to investigation of the multifront (cellular) structure of a self-sustained unsteady detonation wave (DW) propagating in a mixture at rest, determination of the critical conditions of detonation initiation (critical value of the initiation energy), and margi...

Numerical simulations have been performed to study regular and Mach reflections of oblique shock waves (SW) in a steady supersonic flow of a homogeneous combustible gas mixture and different inflow Mach numbers M<sub>in</sub>. The dynamics of the compressible medium was described by two-dimensional unsteady Euler equations. Chemical transformations...

The experimental results are presented an investigation of a broadening multifront detonation wave. The two stages of spontaneous formation of new disturbances and lateral waves were revealed on detonation wave broadening front. The main mechanisms of detonation waves reinitiation are discussed.

Results of experimental investigations of an expanding multifront detonation wave are presented. Two stages of spontaneous formation of new disturbances and transverse waves on the expanding detonationwave front are observed. The main mechanisms of reinitiation of detonation waves are discussed. Twodimensional numerical simulation of the dynamics o...

The main objective of the present work is to study the flow structure with reflection of oblique SW and DW in a steady supersonic flow of a chemically reacting mixture and the transition from regular to Mach reflection.

For the first time the fact of non-self-similarity in unsteady Mach reflection of detonation waves was registered experimentally. In the present study reflection of an unsteady multifront two-dimensional gas detonation wave on a wedge has been numerically simulated for a mixture of 2H2 + O2. The value of the critical wedge angle, at which the trans...

The reflection of an unsteady multifront two-dimensional gas detonation wave on the wedge has been numerically simulated for the mixture of 2H 2 +O2. The value of the critical wedge angle, at which the transition from regular to Mach reflection occurs, is determined for p 0 = 0.2 bar. In the case of Mach reflection, it is established for various we...

The reflection of a nonstationary multifront two-dimensional gas-detonation wave from a wedge is simulated numerically for
a 2H2+O2 mixture. The value of the critical angle of the wedge at which the regular reflection of the detonation wave becomes Mach
reflection is determined forp
0=0.2 bar. In the case of Mach reflection, it is established for v...

A two-dimensional structure of detonation waves in an 2H2+O2+X Ar mixture is numerically studied in a wide range of initial pressures and degrees of dilution. Good qualitative agreement
of the numerical results with experimental data is obtained. The effect of the method of initiation (by one or several sites,
symmetric or asymmetric) on the steady...

An approximate method to calculate the isentrope of a gas in chemical equilibrium is suggested. An analysis of the approximate model conventionally used for this purpose is given.

An approximate method is proposed for calculation of an ideal chemically equilibrated gas isentrope. The possibility was analyzed to use for this purpose an inert gas model with constant adiabatic curve. An analysis is performed of the applicability of the approximate model traditionally used for this purpose.

A model of detonation in a two-phase heterogeneous mixture consisting of bubbles of chemically reacting gas in a chemically inert liquid is proposed. The model takes account of the compressibility and viscosity of the liquid, the presence of an induction period of the chemical reaction, and shift of the chemical equilibrium. The initiation of the w...

Highly resolved, two-dimensional reactive Navier-Stokes numerical simulations with high-accuracy two-step kinetics were used to study the influence of molecular transport processes on multifront detonation waves in a hydrogen−oxygen mixture. Studies of viscous detonation in wide channels show that the governing effect on the number of transverse wa...

## Citations

... The chemical reaction in the DW is described according to the two-stage model of the detonation kinetics (induction period stage and main heat release stage) for two-fuel reacting mixtures first proposed by us in [3,4]. For the first, induction stage, we proposed an original semi-empirical formula for determining the duration of the induction period in a two-fuel mixture, based on kinetic data in empirical Arrhenius-type formulas for the induction time in an individual mixture of each component of the binary fuel with an oxidizer. ...

... A flow-type detonation chamber (DC) with a new design was proposed in our previous publications [1,2]. The DC is an annular channel located between the inner and outer cylindrical walls. ...

... In connection with this issue, in present work a two-dimensional numerical simulation of the structure and parameters of the DW in a mixture of synthesis gas with oxygen and air has been carried out. These studies are based on the chemical kinetics model of detonation combustion of a syngas twofuel mixture proposed by us in [3,4]. Previously, the parameters of the DW in synthesis gas [5] and the ...

... An analytical study performed by Mizener et al. [10] concluded that methane is not a realistic choice for RDC operation due to a significantly larger detonation cell size that impacts the combustor sizing for wave rider configurations. Numerical simulations presented by Trotsyuk [11,12] show detonation wave front configurations of an RDC used for rocket propulsion. The effect of geometrical configuration, type of oxidizer (oxygen or air) and limits of obtaining stable detonation were examined. ...

... A flow-type detonation chamber (DC) with a new design was proposed in our previous publications [1,2]. The DC is an annular channel located between the inner and outer cylindrical walls. ...

... Excitation and decay of strong shock and detonation waves in methane/air and dust-laden media were studied, e.g., in [6][7][8][9][10][11][12][13][14][15][16][17][18]. It was experimentally proven [14,15] that the DW in methane mixtures with a cell size (proportional to the ZND reaction zone length) λ ∼ 0.1 m can be completely suppressed by an inert sheet of silica sand with a particle size δ ∼ 10 2 μm and mean volume density ρ s ≥ 2−3 kg/m 3 . ...

... An analytical study performed by Mizener et al. [10] concluded that methane is not a realistic choice for RDC operation due to a significantly larger detonation cell size that impacts the combustor sizing for wave rider configurations. Numerical simulations presented by Trotsyuk [11,12] show detonation wave front configurations of an RDC used for rocket propulsion. The effect of geometrical configuration, type of oxidizer (oxygen or air) and limits of obtaining stable detonation were examined. ...

... Here we present results of an experimental study of the effect of a plane obstacle located normally to tube axis in front of a detonation tube exit on critical conditions of detonation diffraction. Our results for a stoichiometric C 2 H 2 /O 2 mixture complement the data base obtained by Murray and Lee [3] and Vasil'ev et al. [4] which show that nearly two-fold decrease of d cr to ≈6λ is obtained when the distance L between tube exit and obstacle equals tube diameter d. Using an improved soottechnique of recording trajectories of triple points we have obtained in addition nice illustrations showing in details the mechanism of detonation transition. ...

... In this case the characteristic times of thermal and mechanical relaxation between phases are much shorter than the characteristic times of change in the parameters of the two-phase fl ow inside the DW reaction zone. Thermodynamic parameters of the mixture in chemical equilibrium were calculated from formulas [16][17][18][19] which are highly accurate and consistent with the second law of thermodynamics and take account of the Le Chatelier principle. Results of calculating the detonation rate and the parameters of the wave in the Chapman-Jouguet plane in a stoichiometric silane-air mixture with Al 2 O 3 microparticles are presented in Fig. 5, and the parameters of the wave behind the leading shock front, in Fig. 6. Results of calculating the parameters of detonation in a silane-air gas mixture (G = 0) of varying stoichiometry are presented in Figs. ...

... The critical explosion lengths were correlated with the available cell size data for these mixtures obtained by Vasil'ev et al. [32], Matignon [33] and Moen et al. [34]. The correlation 0 * ≈ 26 captures approximately the entire range of experiments, as shown in Fig. 6. ...