Showing papers in "Combustion Science and Technology in 2020"
TL;DR: The widespread use of the Eddy Dissipation Concept (EDC) of Magnussen has led to a number of suggestions to modify the model as mentioned in this paper, to a varying extent in agreement with the under...
Abstract: The widespread use of the Eddy Dissipation Concept (EDC) of Magnussen has led to a number of suggestions to modify the model. These modifications are to a varying extent in agreement with the under...
34 citations
TL;DR: In this paper, the authors present a comprehensive account of how adding C3H8 impacts the possibility of explosion for CH4-air mixtures, and a series of experiments were carried out to determine the upper and lower fla...
Abstract: This work presents a comprehensive account of how adding C3H8 impacts the possibility of explosion for CH4–air mixtures. A series of experiments was carried out to determine the upper and lower fla...
32 citations
TL;DR: In this paper, the problem of sluggish combustion reactivity of Boron (B) can be overcome by inclusion of fluoropolymers, such as PVDF, Viton, and THV.
Abstract: The problem of sluggish combustion reactivity of Boron (B) can be overcome by inclusion of fluoropolymers. In this paper, three commercial fluoropolymers; PVDF (59 wt% F), Viton (66 wt% F) and THV ...
26 citations
TL;DR: A strut/wall combined fuel injection scheme was experimentally investigated in a flush-wall scramjet combustor fueled with liquid kerosene as discussed by the authors, where a thin strut was adopted as fuel injector and flame holde...
Abstract: A strut/wall combined fuel injection scheme was experimentally investigated in a flush-wall scramjet combustor fueled with liquid kerosene. A thin strut was adopted as fuel injector and flame holde...
25 citations
TL;DR: In this article, the authors compared three types of improved cookstove widely used in Sub-Saharan Africa: a raised-bed charcoal stove, a rocket-type stove using wood and straw, and a gasifier stove.
Abstract: Emissions from traditional cookstoves are a major health concern in developing world households. Improved cookstoves can reduce fuel use and pollutant emissions and here we compare three types of improved cookstoves widely used in Sub-Saharan Africa. These are a raised-bed charcoal stove, a rocket-type stove using wood and straw, and a gasifier stove. Laboratory measurements were made of the main gaseous pollutants, particle size distribution and composition. The genotoxicity of the particles was assessed using a comet assay. The rocket-type stove using dry wood had the highest emission factors for particulate matter and NOX. Emissions of CO and CH4 were a factor of 6-7 higher from the charcoal stove compared with the other stoves tested in this work, and also higher for burning high moisture wood. Fuel properties were critical for emitted particle size, and for the emissions of NOX, black carbon and organic matter.
25 citations
TL;DR: A deep neural network is presented which is trained on flamelet/progress variable (FPV) tables and validated in a combustion large eddy simulation (LES) of the Sydney/Sandia flame with inhomogeneous inlets, thus reducing effectively the memory footprint compared to the FPV tables.
Abstract: In this work, a deep neural network is presented which is trained on flamelet/progress variable (FPV) tables and validated in a combustion large eddy simulation (LES) of the Sydney/Sandia flame wit...
22 citations
TL;DR: In this paper, the combustion regimes of iron particles in a laminar pre-mixed flame (LPF) and in an axisymmetric LDF were studied, respectively.
Abstract: In the work, the combustion regimes of iron particles (d10 = 4.7 µm) in a laminar pre-mixed flame (LPF) and in an axisymmetric laminar diffusion flame (LDF) are studied. For (LPF), we studied the ...
21 citations
TL;DR: Ammonium nitrate (AN) and ammonium perchlorate (AP) are investigated as propellants for their thermal decomposition behaviors and burning characteristics in this paper, where the performance effects of AP particle siz...
Abstract: Ammonium nitrate (AN) and ammonium perchlorate (AP) are investigated as propellants for their thermal decomposition behaviors and burning characteristics. The performance effects of AP particle siz...
20 citations
TL;DR: In this paper, the laminar explosion behaviors of syngas with wider ranges of fuel concentrations and composition fractions were systematically investigated, and the results showed that synggas with higher fuel concentrations is more likely to explode.
Abstract: The present article systematically investigates the laminar explosion behaviors of syngas with wider ranges of fuel concentrations (0.4 ~ 3.0 in equivalence ratio) and composition fractions...
20 citations
TL;DR: In this paper, the impact of pressure on the hydrodynamic instability mechanism in weakly turbulent, lean methane-air premixed slot flames was investigated by means of direct numerical simulations (DNS) employing
Abstract: The impact of pressure on the hydrodynamic instability mechanism is investigated in weakly turbulent, lean methane-air premixed slot flames by means of direct numerical simulations (DNS) employing
19 citations
TL;DR: In coal seam groups, the physical and chemical properties of the residual coal in goaf will be changed after undergoing water leaching and air-drying, affecting the oxidation char as discussed by the authors.
Abstract: During the mining of coal seam groups, the physical and chemical properties of the residual coal in goaf will be changed after undergoing water leaching and air-drying, affecting the oxidation char...
TL;DR: In this paper, the response of burning gaseous fuel jets to prescribed transverse acoustic excitation as a means of exploring the coupling of reactive, acoustic, and flow proces.
Abstract: The present experiments focused on the response of burning gaseous fuel jets to prescribed transverse acoustic excitation as a means of exploring the coupling of reactive, acoustic, and flow proces...
TL;DR: In this article, the possibility of organizing a continuous-detonation combustion of a liquid fuel film in an annular combustor of a detonation liquid-propellant rocket engine has been demonstrated.
Abstract: The possibility of organizing a continuous-detonation combustion of a liquid fuel film in an annular combustor of a detonation liquid-propellant rocket engine has been demonstrated. The nea...
TL;DR: The short-distance coal seam group refers to the coal seams which has obvious mining influence on the adjacent coal seam during mining process as mentioned in this paper. In the process of short distance coal seam mining, th...
Abstract: The short-distance coal seam group refers to the coal seams which has obvious mining influence on the adjacent coal seam during mining process. In the process of short-distance coal seam mining, th...
TL;DR: In this paper, the modeling and simulation of the heating and evaporation of a spherically symmetric single, bi-component ethanol/water droplet in convective air is studied.
Abstract: The modeling and simulation of the heating and evaporation of a spherically symmetric single, bi-component ethanol/water droplet in convective air is studied which allows for an improved understand...
TL;DR: The current reaction kinetics of coal-oxygen compound in water-soaked coal has not been accurately explained as mentioned in this paper, and therefore, thermal behavior and microscopic characteristics during spontaneous combustions during coal combustion are not accurately explained.
Abstract: The current reaction kinetics of coal–oxygen compound in water-soaked coal has not been accurately explained. Therefore, thermal behavior and microscopic characteristics during spontaneous combusti...
TL;DR: In this article, it is shown that temperature is the key factor influencing spontaneous combustion of coal, but it is difficult to obtain accurate temperature data because of the complex physical environment of the mining area.
Abstract: Temperature is the key factor influencing the spontaneous combustion of coal, but it is difficult to obtain accurate temperature data because of the complex physical environment of the mining area....
TL;DR: In this paper, a method for controlling spontaneous combustion of coal gangue is proposed, which is to inhibit the oxidation and suppress the spontaneous combustion in coal gangues, but the method is ineffective.
Abstract: As a typical solid waste, coal gangue is highly susceptible to spontaneous combustion. Conventionally, method for controlling spontaneous combustion of coal gangue is to inhibit the oxidation and s...
TL;DR: In this article, a concurrent computational and experimental study of self-excited combustion dynamics in a model configuration of a lean direct injection (LDI) gas turbine combustor is described.
Abstract: A concurrent computational and experimental study of self-excited combustion dynamics in a model configuration of a lean direct injection (LDI) gas turbine combustor is described. Both acoustically...
TL;DR: In this article, the effect of preoxidation temperature on the thermal behavior of secondary oxidation of coal was studied in a Jurassic coalfield that is susceptible to spontaneous combing.
Abstract: To study the effect of pre-oxidation temperature on the thermal behavior of secondary oxidation of coal, this paper studies samples from a Jurassic coalfield that is susceptible to spontaneous comb...
TL;DR: In this paper, four different sizes of tripolyphosphate modified expandable graphite (EGp) were prepared and incorporated into linear low density polyethylene (LLDPE).
Abstract: Four different sizes of tripolyphosphate modified expandable graphite (EGp) are prepared and incorporated into linear low density polyethylene (LLDPE). Its size effect on the material combustibilit...
TL;DR: In this paper, the effects of a moving flame front on the thermo-acoustic oscillations in nonuniform combustors were investigated considering both the cavity and intrinsic resonant feedbacks.
Abstract: This work investigates the effects of a moving flame front on the thermoacoustic oscillations in nonuniform combustors considering both the cavity and intrinsic resonant feedbacks. This theoretical...
TL;DR: The study of high-pressure turbulent combustion is a relatively new field in the realm of combustion studies and the coupling between the conservation equations and the equation of state is examined in this paper.
Abstract: The study of high-pressure turbulent combustion is a relatively new field in the realm of combustion studies. The coupling between the conservation equations and the equation of state is examined h...
TL;DR: In this paper, lean combustion is adopted in the practical gas turbine combustors as it offers a solution to reduce the emission of NOx. But lean blowout (LBO) is considered as the main threat in taking the ultra...
Abstract: Lean combustion is adopted in the practical gas turbine combustors as it offers a solution to reduce the emission of NOx. But lean blowout (LBO) is considered as the main threat in taking the ultra...
TL;DR: In this paper, the experimental study of the features of phase formation processes in preliminary mechanically activated powder mixture Ti+Al was conducted, and the synthesis was realized using the phase formation process.
Abstract: In the present work, the experimental study of the features of phase formation processes in preliminary mechanically activated powder mixture Ti+Al was conducted. The synthesis was realized...
TL;DR: In this paper, a NaHCO3/kaolin composite powder explosion suppressor was prepared by antisolvent-dissolution method, and the effect of the suppressor on aluminum powders was investigated.
Abstract: In this paper, NaHCO3/kaolin composite powder explosion suppressor was prepared by antisolvent-dissolution method The effect of NaHCO3/kaolin composite powder explosion suppressor on aluminum powd
TL;DR: In this paper, the dynamics of annular combustors during ignition and combustion instabilities are reviewed, by examining experiments carried out in a systolic generator with an annular combustion engine.
Abstract: New results on the dynamics of annular combustors during ignition and combustion instabilities will be reviewed. Ignition dynamics is considered first by examining experiments carried out in a syst...
TL;DR: In order to reveal the reaction mechanism responsible for the spontaneous combustion of water-immersed coal, this article researched the changes in the physical and chemical structures of coal sample, and found that coal can be classified into two categories: water-imperceptible and water-impregnated coal.
Abstract: In order to reveal the reaction mechanism responsible for the spontaneous combustion of water-immersed coal, this study researched the changes in the physical and chemical structures of coal sample...
TL;DR: In this article, a three-dimensional numerical simulation of a localized stratified tubular flame burner was carried out by using propane as fuel, and the characteristics of the flow field, species distribution, flame s...
Abstract: A three-dimensional numerical simulation of a localized stratified tubular flame burner is carried out by using propane as fuel. The characteristics of the flow field, species distribution, flame s...
TL;DR: In this paper, the pyrolysis of Huadian oil shale was carried out in a non-isothermal thermorgravimetric thermal analyzer system, where the particle size (0.3-0.45 mm, 0.15- 0.2 mm, and 0.088-1.15 mm) was calculated.
Abstract: The pyrolysis of Huadian oil shale was carried out in a non-isothermal thermorgravimetric thermal analyzer system. The particle size (0.3–0.45 mm, 0.2–0.3 mm, 0.15–0.2 mm, 0.088–0.15 mm, 0....