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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...
Guanidinylated chitosan (GCS), as a heterogeneous alkaline catalyst for the transesterification of soybean oil with methanol, was synthesized by grafting aminoiminomethanesulfonic acid onto chitosan. The structure and properties of GCS membrane were investigated by Fourier transform infrared spectroscopy, thermogravimetry and X-ray photoelectron spectroscopy. The soybean oil conversion reached 98...
Measurements on laminar flame speeds and ignition delay times of methane/air mixtures at elevated pressures and temperatures were carried out in a constant volume bomb and shock tube. The performances of GRI Mech 3.0, USC Mech II, and Aramco Mech 1.3 mechanisms were also evaluated from the data obtained. Results showed that the measured laminar flame speeds from the constant volume bomb by the linear...
Ignition delay times of dimethyl carbonate were measured in a shock tube for the first time at T=1100–1600K, p=0.12–1.0MPa, fuel concentration=0.5–2.0%, and ϕ=0.5–2.0. A modified chemical kinetic model was developed and can well predict ignition delay times and activation energies. Further validation of the proposed kinetic model was made on the basis of the opposed flow diffusion flame data. Reasonable...
Laminar flame speeds of dimethyl ether/methane–air mixtures were measured in a constant volume combustion vessel at different initial temperatures (303–453K), initial pressures (0.1–0.7MPa), dilution ratios (0–25%), equivalence ratios (0.7–1.6) and over wide range of DME blending ratios (0–100%). Markstein lengths were also obtained at different blending ratios and equivalence ratios. Zhao DME model...
Laminar flame speeds of 2-methyl-1-butanol (2MB)–air mixture at temperatures of 393, 433 and 473K, pressures of 0.1, 0.25, 0.5 and 0.75MPa, and equivalence ratios of 0.6–1.8 were measured using the spherically propagating flame. Flame instabilities were analyzed using the Lewis number, flame thickness, density ratio and Markstein length combining with the schlieren photos. Flame instability is insensitive...
This study compares liquid fuel combustion characteristics of biofuels derived from camelina (POSF6152) and tallow (POSF6308) with a US domestic aviation fuel (Jet-A, POSF4658) using the spherically symmetric (one-dimensional) droplet flame configuration as the basis of comparison. A blend of camelina biofuel and Jet-A is also examined. The initial droplet diameters were fixed at 0.57±0.03mm. The...
This work investigated the effects of induction of hydrogen and oxygen mixture (H 2 /O 2 ) to a heavy-duty diesel engine (HDDE) on the thermal performance, fuel consumption and emission characteristics. The HDDE was tested at one low load steady-state condition, 24.5% of the max load (40km/h), using neat diesel and seven H 2 /O 2 mixtures: 10–70L/min, interval 10L/min...
This investigation was aimed at studying the influence of 21–30% oxygen concentration on the heating rate, emissions, temperature distributions, and fuel (natural gas) consumption in the heating and furnace-temperature fixing tests. Increase in the oxygen concentration led to a more rapid heating rate and lesser fuel consumption due to lower levels of the inert gas (N 2 ). When the oxygen...
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