Ekaterina Mikheyeva

• PhD
• Researcher at Joint Institute for High Temperatures, Russian Academy of Sciences

Currently, substances are being actively sought that could serve as the alternative fuel or fuel additive reducing formation and emission of the carbon nanoparticles. Here, processes of the polyaromatic hydrocarbons (precursors of the carbon condensed phase formation) and carbon black nanoparticles formation during the ethylene pyrolysis with addit...

The problems of improving the safety of various industrial facilities dealing with combustible mixtures are constantly in the center of increased attention. The introduction of chemically active additives into the gas mixture is considered as one of the most effective ways to prevent ignition and explosion. One of the most promising highly effectiv...

In this article, we experimentally studied the effect of acetone impurities on the induction time and soot yield during the self-decomposition of acetylene behind shock waves. The results of the experiments showed that variation of the acetone impurity in the range 0.5–3.0%, characteristic of technical acetylene, does not have a significant effect...

The influence of various oxygenated co-reactants on soot formation was addressed by studying the pyrolysis of gas mixtures using ethylene as a base fuel in the absence of molecular oxygen. Alcohols (methanol, ethanol, and n-butanol) and ethers (diethyl ether, dimethoxymethane, furan, and tetrahydrofuran) were selected as oxygenated co-reactants. Th...

In this work, the kinetics of pyrolysis and subsequent soot yield in undiluted mixtures of acetylene with chemically active additives, namely acetone, hydrogen, oxygen, methane and propane–butane mixture, were investigated numerically over a wide range of pressures and temperatures using the modern kinetics mechanisms. It was shown that with differ...

In this paper, the dependence of the sublimation temperature of soot particles synthesized during the combustion of various hydrocarbons, depending on their size and structure, is obtained. The experimental approach is based on the analysis of the thermal radiation of particles heated to the sublimation temperature by a nanosecond laser pulse. The...

In this work the laser-induced fluorescence (LIF) method was used to study the formation of polyaromatic hydrocarbons (PAHs) in the pyrolysis of benzene C6H6 and dimethyl ether C2H6O (DME) mixtures diluted with argon behind reflected shock waves within a temperature range of 1300–2000 K and pressures of 3.5–5.7 bar. To monitor the volume fraction o...

To understand the behavior of the optical properties of soot in the visible and near-infrared spectral range, it is crucial to determine the magnitude of their emission and absorption. Such information is necessary for a development of diagnostic methods for soot. We measured the absolute value of the refractive index functions of soot nanoparticle...

The effect of various hydrocarbon additives, dissociating with methyl radical formation, on acetylene decomposition over the wide range of temperatures was studied. Methane, ethane, propane/butane mixture, dimethyl ether (DME), and diacetyl were considered. The experiments with acetylene doped with methane, DME, and diacetyl and diluted with argon...

Acetylene black is a special type of carbon black, obtained from the thermal decomposition of acetylene. Acetylene flames enable the investigation of the soot optical properties. A reliable knowledge of the optical properties of acetylene soot is necessary for interpreting the optical measurements in flames and the development of acetylene black ap...

McKenna burner providing premixed, laminar, steady flat flame is widely used in the combustion community. The ethylene/air flame with equivalent ratio of 2.34 is considered as one of the target flames for the development and calibration of optical diagnostics of soot particles. In this work, the accurate soot particle sizing in dependence on the he...

Acetylene is an exothermic hydrocarbon capable of self-decomposition and detonation without an oxidizing agent.

Data on the optical properties of soot are necessary to calculate the amount of sunlight absorbed by nanoparticles in the atmosphere and on the surface of the ice. Such information is used for calculating the radiation heat exchange in combustion processes, assessing the quality of carbon black, and other applications. To date, a large amount of da...

The nonequilibrium radiation occurring during ignition of a 10% stoichiometric hydrogen-oxygen mixture with flame suppressant additives diluted with argon behind shock waves was studied. Instead of the expected reduction in the super-equilibrium radiation of active radicals in the ignition zone, the addition of halogenated flame suppressants led to...

It was noted a significant increase in soot formation with the addition of methane in the pyrolysis of acetylene in shock tubes. Qualitative kinetic analysis revealed an increase of propargyl formation due to methyl/methylene and acetylene recombination. Here, we study the role of methyl radicals in the soot formation process more carefully. Mixtur...

Experiments on the pyrolysis of C2H2/Ar and C6H6/Ar mixtures with addition of H2, O2, and CH4 have been carried out behind reflected shock waves at temperatures ranging from 1400 to 2600 K. Soot formation was measured by laser extinction at 633 nm. Time-resolved temperature measurements were performed via two-color CO absorption on the P(8) and R(2...

Time-resolved laser-induced incandescence for particle sizing and laser light extinction for soot volume fraction was applied simultaneously to study the influence of methane addition on soot formation in acetylene pyrolysis. Three series of the experiments with initial mixtures of 2% C2H2 + Ar, 1% CH4 + Ar and 2% C2H2 + 0.5/1/2% CH4 + Ar in the te...

This work is devoted to the investigation of combustion of simple and complex gaseous fuels: methane and hydrogen with admixtures of the most promising alcohols: ethanol and butanol. The process of ignition of investigated blends behind reflected shock waves in the temperature range of 1000–1600 K and pressure range of 4.5–6 bar was studied. The te...

In this work an influence of the wide range of various inhibitors, namely CCl4, CF3H, C2F4Br2, (CH3O)3P, CF3I and C3F7I on shock-induced ignition of hydrogen was experimentally investigated. Observed temperature dependencies of induction times indicates that CF3H and (CH3O)3P do not show noticeable inhibiting activity at given conditions, while the...

The influence of laser heated iron and carbon nanoparticles on ignition of 20 vol% stoichiometric methane–oxygen mixture in argon was studied experimentally in shock tube reactor. The concentration of nanoparticles 0.3–2.0 ppm was measured by laser light extinction. The particles were heated by Nd:Yag laser pulse operated at wavelength 1064 nm. The...

The nonequilibrium radiation in the spectral range of 210-415 nm at ignition of a 10% stoichiometric hydrogen-oxygen mixture with additives of combustion inhibitors diluted with argon behind shock waves was registered. The detected chemiluminescence is presumably attributed to electronically excited H2O* and H2O2 *. Instead of the expected quenchin...

A new experimental approach to the analysis of thermodynamic properties of amorphous carbon nanoparticles synthesized via hydrocarbon pyrolysis behind shock waves is discussed. The proposed approach is based on the analysis of thermal radiation of nanoparticles heated by a laser pulse. The sublimation temperature of the carbon nanoparticles might b...

Investigation of combustion of various mixtures is still a hot topic concerning the increase of application of various fuels as well as searching for replacement of fire suppressants [1] which produce environment pollutions and have a hazard of the climate change. Experimental study of ignition and combustion processes of simple substances such as...

Toughening environmental standards for concentration of emitting greenhouse gas (GHG) and soot particulates in combustion of the hydrocarbon fuels initiate development of new fuels. One of the perspectives for development is the partial or complete replacement of fossil fuels with biofuel. Alcohols and, in particular, ethanol are the promising type...

The experiments were performed to investigate the influence of the flame suppressants CCl4, CF3H, and C2F4Br2 on the ignition of hydrogen–oxygen, acetylene–oxygen and methane–oxygen mixtures behind shock waves. The temperature dependencies of the ignition delay times and temperature profiles in the induction zone were measured. The experiments show...

The experimental investigation of iron-carbon nanoparticles synthesis by joint laser photolysis of iron pentacarbonyl in the mixture with methane or acetylene has been carried out. The radiation source used for photo-dissociation of precursors was a pulsed Nd:Yag laser operated at a wavelength of 266 nm. Under uv radiation the molecules of Fe(CO)5...

Nonmonotonous variation of the optical properties of iron nanoparticles with a temperature increase during heating behind reflected shock waves is discovered. Iron nanoparticles, within 12 nm in size, were formed at 0.5–1% Fe(CO)5 pyrolysis in argon behind the incident shock waves. Using a laser extinction method, a variation of the volume fraction...

An influence of haloalkanes CF3H and CCl4 (known as inflammation and explosion suppressors) on combustion and pyrolysis of acetylene behind shock waves was experimentally studied. While ignition delay times in stoihiometric acetylene-oxygen mixtures were expectedly increased by halogenoalkanes admixtures, the induction times of carbon particle form...

This work is devoted to the experimental and theoretical study of charged carbon nanoparticles formed at the pyrolysis of various carbon-containing substances behind shock waves. The experimental results and the computer simulation of the electrical charging of carbon nanoparticles produced during the pyrolysis of C3O2, CCl4, and C6H6 in shock wave...

Simultaneous measurements of the temperature dependencies of the size, growth rate and relative yield of soot particles were carried out in the shock wave pyrolysis of various carbon-bearing species (carbon suboxide –C3O2, acetylene –C2H2 and benzene –C6H6). In all substances studied in the temperature ranges from 1800–2000 K to 2500–3000 K, a shar...

The carbon particle formation process in a pyrolysis of benzene and benzene–ethanol mixtures diluted by argon at initial temperatures 1650–2600 K and pressures 1.4–5.5 bar behind reflected shock waves was studied. The manifold optical diagnostics: emission–absorption spectroscopy for gas-particle temperature, time-resolved laser-induced incandescen...

The process of vaporisation of carbon and iron nanoparticles induced by a nanosecond Nd:YAG laser pulse at a wavelength of 1,064 nm was investigated. A drop of a volume fraction of both types of particles after the YAG laser pulse was observed by laser light extinction at a wavelength of 633 nm. The nanoparticle sizes and peak particle temperature...

Time-resolved laser-induced incandescence (TiRe-LII) for particle sizing, laser light extinction for optical density of condensed phase registration and emission–absorption spectroscopy for the temperature measurements were applied simultaneously to study the influence of molecular hydrogen addition on carbon particle formation during acetylene pyr...

The evidence of the change of the complex refractive index function E(m) of carbon and iron nanoparticles as a function of their size was found from two-color time-resolved laser-induced incandescence (TiRe-LII) measurements. Growing carbon particles were observed from acetylene pyrolysis behind a shock wave and iron particles were synthesized by p...