Showing papers in "Combustion Science and Technology in 2019"
TL;DR: In this article, a 4 stroke-4 cylinder-Yanmar TF120M diesel engine was tested during 300h on diesel fuel (DF) and preheated straight jatropha oil to evaluate the effects of these two fuel types on the degree of deposit formation, LO, brake-specific fuel consumption (BSFC), and emission characteristics.
Abstract: Using vegetable oils as fuel for diesel engines in the long term may cause some extremely serious problems, such as an increase in toxic emission and pollutants, reduction in engine power, and degradation of lubricating oil (LO) due to deposit formation, abrasion, and wear, as well as damaged engines. In this study, the 4 stroke–4 cylinder-Yanmar TF120M diesel engine was tested the endurance during 300 h on diesel fuel (DF) and preheated straight jatropha oil to evaluate the effects of these two fuel types on the degree of deposit formation, LO, brake-specific fuel consumption (BSFC), and emission characteristics. The results showed that, although the properties of straight jatropha oil were improved by preheating at 90°C (SJO90), the degree of deposit formation for SJO90 was observed higher in comparison with DF. Furthermore, scanning electron microscopy (SEM) was used to analyze the deposits. Related to engine performance and emission characteristics, higher BSFC, unburnt hydrocarbons and carbon...
88 citations
TL;DR: In this paper, the effects of water immersion on the spontaneous combustion of low-rank bituminous coal were investigated and the underlying mechanism, the pore size distributions and active functional group was analyzed.
Abstract: To understand the effects of water immersion on the spontaneous combustion of low-rank bituminous coal, and the underlying mechanism, the pore size distributions and active functional group...
36 citations
TL;DR: In this paper, a model for the oxidation of methanol and ethanol and their fuel interaction with NOx (NO and NO2) chemistry in jet-stirred and flow reactors is presented.
Abstract: This work presents a newly developed model for the oxidation of methanol and ethanol and their fuel interaction with NOx (NO and NO2) chemistry in jet-stirred and flow reactors, freely propagating ...
30 citations
TL;DR: In this paper, the bending effect of turbulent flame speed variation was investigated, i.e., the deviation from the linear increase of flame speed with increasing root-mean-square turbulent velocity fluctuation.
Abstract: The bending effect of turbulent flame speed variation (i.e., the deviation from the linear increase of flame speed with increasing root-mean-square turbulent velocity fluctuation) has been investig...
30 citations
TL;DR: In this paper, the authors used data-driven methods to morph a series of time-resolved experimental OH-PLIF images into corresponding three-component planar PIV fields in the closed domain of a premixed swirl.
Abstract: This work utilizes data-driven methods to morph a series of time-resolved experimental OH-PLIF images into corresponding three-component planar PIV fields in the closed domain of a premixed swirl c...
28 citations
TL;DR: In this paper, the forced flame responses in a pressurized gas turbine combustor were predicted using numerical reacting flow simulations using two incompressible 1 large eddy simulation solvers.
Abstract: The forced flame responses in a pressurized gas turbine combustor are predicted using numerical reacting flow simulations. Two incompressible1 large eddy simulation solvers are used, applying two c...
27 citations
TL;DR: In this article, an optically accessible racetrack-like combustor designed for observation using high-speed photography is proposed, and a series of continuous rotating detonation (CRD) experiments with different combustor width, injection scheme, propellant and equivalence ratio are conducted.
Abstract: The optically accessible racetrack-like combustor designed for observation using high-speed photography is proposed. Series of Continuous Rotating Detonation (CRD) experiments with different combustor width, injection scheme, propellant and equivalence ratio are conducted. The operating domain results show that combustor width is a key factor for CRD realization. Ethylene CRD can be achieved on larger width combustor. Two propagation modes, namely, two waves in hetero-rotating mode and single wave mode, are achieved in the experiment. Based on the high-frequency pressures and high-speed photography images, the propagation characteristics and flowfield structures are discussed in detail. Some special flowfield structures are also observed and analyzed, including streak structure and downstream shock wave-ahead structure. The study will enhance the understanding of flowfield structure and flame dynamics of CRD Wave.
26 citations
TL;DR: The proposed HMM-based method has been validated on experimental data collected from an electrically heated Rijke tube apparatus for predicting onset of thermoacoustic instabilities and the results have been compared with those of the current state-of-the-art measurement techniques for instability growth rate and associated computational complexity.
Abstract: This paper presents a dynamic data-driven method for early detection of thermoacoustic instabilities in combustors based on short-length time series of sensor data, where the objective is n...
25 citations
TL;DR: A potential able to capture the properties and interactions of curved polycyclic aromatic hydrocarbons (cPAHs) was developed and used to investigate the nucleation behavior and structure of nascent precursors as mentioned in this paper.
Abstract: A potential able to capture the properties and interactions of curved polycyclic aromatic hydrocarbons (cPAHs) was developed and used to investigate the nucleation behavior and structure of nascent...
23 citations
TL;DR: In this article, a detailed kinetic mechanism employing a discrete sectional model is proposed to deal with nanoparticles in a combustion engine. But the model is not suitable for the combustion efficiency of nanoparticles.
Abstract: Combustion-generated nanoparticles cause detrimental effects to not only health and environment but also combustion efficiency. A detailed kinetic mechanism employing a discrete sectional model is ...
23 citations
TL;DR: In the market of gas-fired devices, the share of condensing premixed boilers has strongly increased over the last years, since these devices will be the leading technology in the near future as discussed by the authors.
Abstract: In the market of gas-fired devices, the share of condensing premixed boilers has strongly increased over the last years, since these devices will be the leading technology in the near future. Despi...
TL;DR: In this paper, the selective non-catalytic reduction of NO by ammonia (SNCR) has been extensively studied but no activation of ammonia oxidation by nitric oxide had been reported.
Abstract: The selective non-catalytic reduction of NO by ammonia (SNCR) has been extensively studied but no activation of ammonia oxidation by nitric oxide had been reported. Experiments performed in a jet-s...
TL;DR: In this paper, experimental results on laminar propane flames propagating in a narrow gap between parallel glass plates are presented, and the development and evolution of cellular flame structure is demonstrated.
Abstract: Experimental results on laminar propane flames propagating in a narrow gap between parallel glass plates are presented. Development and evolution of cellular flame structure is demonstrated...
TL;DR: In this article, Laminar and turbulent spherically expanding n-heptane flames in mono-sized fuel droplet-mists have been simulated for a range of different overall equivalence ratios and droplet diameters using thrashing.
Abstract: Laminar and turbulent spherically expanding n-heptane flames in mono-sized fuel droplet-mists have been simulated for a range of different overall equivalence ratios and droplet diameters using thr...
TL;DR: In this article, the effects of methane on the characteristics of coal spontaneous combustion, coal low-temperature oxidation and Fourier transform infrared spectroscopy experiments were conducted to explore the effect of the gas on spontaneous combustion.
Abstract: To explore the effects of methane on the characteristics of coal spontaneous combustion, coal low-temperature oxidation and Fourier transform infrared spectroscopy experiments were conducted. The t...
TL;DR: The share of energy production from renewable sources is continuously increasing and aims at reaching two-thirds of primary energy supply in 2050 as mentioned in this paper, in this scenario, the 2009/28/EC Directive...
Abstract: The share of energy production from renewable sources is continuously increasing and aims at reaching two-thirds of primary energy supply in 2050. In this scenario, the 2009/28/EC Directive...
TL;DR: In this article, synthetic and natural polymeric esters find applications in transport and construction sectors, where fire safety is an important concern, and one polymer that is widely used is poly (methyl me...
Abstract: Synthetic and natural polymeric esters find applications in transport and construction sectors, where fire safety is an important concern. One polymer that is widely used is poly (methyl me...
TL;DR: In this paper, the growing demand of natural gas inspires existing and new projects in topographical areas where the hydrocarbon extraction meets severe safety challenges due to the presence of hydrogen and other hydrogen-sensors.
Abstract: The growing demand of natural gas inspires existing and new projects in topographical areas where the hydrocarbon extraction meets severe safety challenges due to the presence of hydrogen s...
TL;DR: In this article, the overall performance of a hybrid solar receiver combustor when operated under the moderate or intense low oxygen dilution (MILD) combustion mode and contrast it with the mild combustion mode.
Abstract: This article examines the overall performance of a hybrid solar receiver combustor when operated under the moderate or intense low oxygen dilution (MILD) combustion mode and contrast it wit...
TL;DR: An experimental study was carried out to evaluate an alternative disposal route for waste orange peels, which includes their upgrade into a solid biofuel and, possibly, the production of va....
Abstract: An experimental study was carried out to evaluate an alternative disposal route for waste orange peels, which includes their upgrade into a solid biofuel and, possibly, the production of va...
TL;DR: In this article, a swirl-stabilised flame close to blow-off conditions in a gas turbine model combustor was investigated using large eddy simulation and the sub-grid combustion was modelled using a presumed probability.
Abstract: A swirl-stabilised flame close to blow-off conditions in a gas turbine model combustor is investigated using large eddy simulation. The sub-grid combustion is modelled using a presumed probability ...
TL;DR: In this article, physical and mathematical models for the description of the detonation process in mixtures of hydrogen-oxygen, methane -oxygen and silane-air in the presence of inert nanoparticles were presented.
Abstract: The physical and mathematical models for the description of the detonation process in mixtures of hydrogen–oxygen, methane–oxygen, and silane–air in the presence of inert nanoparticles were...
TL;DR: Transported probability density function (TPDF) methods are attractive for modeling turbulent flames as the highly nonlinear chemical reactions appear in closed form as discussed by the authors, and the ability of the TPD...
Abstract: Transported probability density function (TPDF) methods are attractive for modeling turbulent flames as the highly nonlinear chemical reactions appear in closed form. The ability of the TPD...
TL;DR: In this article, an alternative definition of the wrinkling factor and the resolved component of flame surface density (FSD) in the context of Large Eddy Simulations (LES) is discussed.
Abstract: This paper discusses an alternative definition of the wrinkling factor and the resolved component of flame surface density (FSD) in the context of Large Eddy Simulations (LES) modelling of ...
TL;DR: In this paper, three-dimensional compressible Direct Numerical Simulations (DNS) have been used to investigate the localized forced ignition of statistically planar mixing layers of biogas/air mixtures for differ...
Abstract: Three-dimensional compressible Direct Numerical Simulations (DNS) have been used to investigate the localized forced ignition of statistically planar mixing layers of biogas/air mixtures for differ...
TL;DR: In this paper, the effect of nanoscale energetic aluminum (nAl) and inert silicon dioxide (nSiO2) particulate additives on ethanol droplet combustion was studied under atmospheric conditions.
Abstract: The effect of nanoscale energetic aluminum (nAl) and inert silicon dioxide (nSiO2) particulate additives on ethanol droplet combustion was studied under atmospheric conditions. Three differ...
TL;DR: In this article, it was noted that a significant increase in soot formation with the addition of methane in the pyrolysis of acetylene in shock tubes was observed, leading to an increase of propargation.
Abstract: 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 proparg...
TL;DR: A metal/metalloid particles as additives in polymeric fuels have been investigated since several decades, among which boron has been remaining the most attractive one due to its high energy density as mentioned in this paper.
Abstract: Metal/metalloid particles as additives in polymeric fuels have been investigated since several decades, among which boron has been remaining the most attractive one due to its high energy density. ...
TL;DR: In this paper, detailed numerical simulations have been performed to study the ignition behavior of hot spherical particles at atmospheric conditions, where the particles move relative to a combustible gas with the help of a dynamometer.
Abstract: Detailed numerical simulations have been performed to study the ignition behavior of hot spherical particles at atmospheric conditions. The particles move relative to a combustible gas with...
TL;DR: As coal reservoirs containing high methane content are more prone to spontaneous combustion, disasters caused by the combined effects of methane and coal spontaneous combustion have been in this paper, where the authors investigated the effects of spontaneous combustion in coal reservoirs.
Abstract: As coal reservoirs containing high methane content are more prone to spontaneous combustion, disasters caused by the combined effects of methane and coal spontaneous combustion have been in...