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Thickened flame (TF) model is one of the effective methods to resolve the flame front in turbulent premixed combustion modeling. The multi-step reaction mechanism is becoming increasingly important for combustion simulations such as pollutant formation, ignition and extinction. The effect of TF model on flame structures when coupling with multi-step reaction mechanism was investigated. The simulation...
The rate coefficients of H abstraction and OH addition reactions of 2,4,4-trimethyl-1-pentene with OH were determined by both canonical variational transition state theory and conventional transition state theory. The potential energy surfaces were calculated at CCSD(T)/6-311++G(d, p)//BHANDHLYP/6-311(d, p) level and quantum effects were evaluated by the one-dimensional Wigner method and the multidimensional...
In the present study, combustion performance and the physical and chemical characteristics of soot particles from a DI diesel engine were studied. The engine was fueled with n-pentanol mixed with biodiesel at 15% and 30% by volume and operated at 1800rpm under three engine loads (20%, 50% and 80% load). In comparison with pure biodiesel, the pentanol-biodiesel blends lead to delayed start of combustion...
Quantum chemistry and rate constants of reactions such as H-abstraction of diethyl ether (DEE) by H, OH, HO2, O and CH3 radicals as well as DEE and DEE radicals decomposition and isomerization were carried out through high-level ab initio and RRKM master equation computations. A comparison was made between some of the calculated rate constants and literature data. A detailed kinetic mechanism for...
Nitrogen dioxide (NO2) is a dominant component of NOx pollution in combustion of internal combustion engines and gas turbines. Its sensitization on ignition of ethane which is a main component of natural gas has been investigated in this experimental and kinetic study. Ignition delay times of NO2/C2H6/O2/Ar mixtures, with blending ratios of NO2:C2H6 of 0.3:1 and 1:1, were measured in a shock tube...
In this study, the ignition delay times of lean and stoichiometric DME/n-butane/air mixtures were measured behind reflected shock waves at pressures of 2 and 10atm, temperatures from 650 to 1400K. The performances of several chemical kinetic models were evaluated. Numerical simulation and chemical kinetic analysis were conducted in a broad temperature range and at various DME blending ratios to understand...
In this work, the effects of the injector K factor on the spray characteristics have been investigated by using a high pressure common rail injection system and a constant volume chamber. The near nozzle region spray tip behavior, the spray macroscopic characteristics, and the droplet statistics in a fixed spray location is sequentially examined. Specifically, in the near nozzle region, laser pulse...
Experiments of ignition delay times on 2,4,4-trimethyl-1-pentene were performed behind reflected shock waves at pressure ranging from 2atm to 10atm, at equivalence ratios from 0.5 to 2.0, and with fuel concentrations of 0.5%, 0.75% and 1%. All ignition delay times follow the Arrhenius rule, and discussions on the effect of pressure, temperature, equivalence ratio and fuel concentration on ignition...
In this work, the near-nozzle spray characteristics of soybean biodiesel, di-n-butyl ether (DBE)/biodiesel blends and 0# diesel were investigated by using a high pressure common-rail injection system and the effect of experiment conditions and fuel physical properties on the near-nozzle spray structures were explored. Microscopic spray images at the near-nozzle field were captured by the high-resolution...
Ignition delay times were measured behind reflect shock waves for the lean DME/n-pentane fuel blends with DME blending ratios from 0% to 100% over a wide range of conditions: pressures from 2 to 20atm, temperatures from 1100 to 1600K and equivalence ratio of 0.5. Correlations of ignition delay times of DME/n-pentane were deduced from the experimental data using multiple linear regression. Comparison...
Ignition delay times of dimethoxy methane (DMM), n-heptane and DMM/n-heptane mixtures were measured behind reflected shock waves. The experiments were performed at the temperature ranges of 1100–1600K, at pressures of 2 and 10atm and equivalence ratios of 0.5, 1.0 and 2.0. A chemical kinetic model for DMM/n-heptane blends was built and validated with the experimental data. The calculations well agreed...
N-butanol is a promising alternative fuel for automobile whose explosion characteristics should be a major focus before widely used. Unfortunately, limit researches focusing on its explosion characteristics have been launched until now. In this study, the effects of n-butanol addition on the explosive characteristics of iso-octane-air mixtures with various concentrations and initial pressures and...
The pressure history in the explosion syngas/air mixtures with H2O addition over a wide range of equivalence ratios at elevated temperatures was recorded to study the explosion characteristics in a constant volume confined vessel. CO mole fractions in syngas are from 0.5 to 0.95, initial temperatures are from 373K to 473K, and H2O addition ratios are from 0 to 30%. The explosion parameters such as...
An experimental and numerical study was performed on laminar flame speeds of styrene and ethylbenzene at the equivalence ratios of 0.8–1.5, initial temperatures of 358K, 398K and 450K and atmospheric pressure in a heated cylindrical constant volume chamber with volume of 5.58L. The experimental results revealed that styrene has the faster laminar flame speeds and the larger Markstein lengths than...
Laminar burning velocities and Markstein lengths of CH4/O2/N2 mixtures were measured in a constant volume combustion chamber over a wide range of O2 contents and equivalence ratios at elevated pressures. The laminar burning velocities were extracted using an accurate nonlinear methodology with properly chosen flame radii to reduce the systematic uncertainty. Chemical kinetic simulation was conducted...
Laminar flame speeds of methanol-isooctane blends were experimentally determined using the spherically propagating flame in a constant volume chamber at two initial temperatures (363 and 393K), different blending ratios of methanol in liquid volume (0%, 20%, 40%, 80%, 100%), and over equivalence ratios of 0.7–1.6. Nonlinear methodology was employed to remove the stretch effect in the data processing...
In this work, the spray and atomization characteristics of neat soybean biodiesel fuel (BD100) and biodiesel/n-butanol blends (BDB80, 20% of n-butanol (wt.)), were investigated at room temperature and ambient pressure of 1 and 2MPa. A high-pressure common-rail injection system was used to generate sprays from an injector (aperture 0.25mm) at a maximum injection pressure of 100MPa. High speed schlieren...
Nitrogen dioxide (NO2) is an important impurity in coal-bed methane (CBM) and a dominant component of NOx pollution in practical engines. Its promoting effect on methane ignition has been studied in the current experimental and kinetic study. Ignition delay times of NO2/CH4/O2/Ar mixtures, with blending ratios of NO2:CH4 of 30:70, 50:50 and 70:30 for stoichiometric methane mixtures were measured in...
Ignition delay times of 1-pentene and n-pentane were measured using a shock tube at pressures from 0.12MPa to 1.0MPa, at equivalence ratios from 0.5 to 2.0 with 0.5% and 1.0% fuel concentrations, in the temperature range of 1040–1880K. Correlations of 1-pentene and n-pentane ignition delay times were deduced from the experimental data using a multiple linear regression. A NG model, JetSurF2.0 model...
A comparative study was experimentally performed on the explosion characteristics of four pentanol isomer–air mixtures (n-pentanol, 3-methyl-1-butanol, 2-methyl-1-butanol, 2-methyl-2-butanol), at various initial temperatures and initial pressures. The explosion parameters of explosion pressure, maximum rate of pressure rise, combustion duration and combustion development period were measured. The...
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