The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Dedicated exhaust gas recirculation is an attractive way to improve the performances of internal combustion engines. Hydrogen (H2) and carbon monoxide (CO) are primary combustible components in the reforming cylinder. Detailed knowledge of the effects of H2/CO on knock tendency and intensity and even lean limit is essential for the better utilization of this sort of technologies. In this paper, the...
Polyoxymethylene Dimethyl Ether (PODEn, n = 3–5) is a potential alternative fuel or a green fuel additive for diesel engines, owing to the unique C–O alternating chain structure (CH3O[CH2O]nCH3) and high cetane number. In this paper, the rate constants for five reaction classes about the model molecule PODE1, including hydrogen abstraction, beta-scission of corresponding R radicals, isomerization...
The main objective of this study is to investigate the effect of ambient pressure (Pamb) on the morphology of multi-jet flash boiling sprays and to promote the understanding on the collapse mechanism. With the high-speed imaging technique, the n-hexane spray process in a constant volume vessel was captured under the ambient pressures from 2kPa to 101.3kPa and the fuel temperatures (Tfuel) from 20°C...
Two typical types of bituminous coal (JN and SH) were employed for thorough devolatilization, then the samples were functionalized by O2 at 1073K to different conversion ratios (JN: 0.21, 0.34, 0.40, 0.53 and 0.63; SH: 0.15, 0.22, 0.32, 0.42 and 0.52) before the surface oxygen containing complexes C(O) were qualitatively and semi-quantitatively characterized by Fourier transform infrared spectroscopy...
Biodiesel is a promising alternative fuel for diesel engines. Polyoxymethylene Dimethyl Ethers (PODE), which features high cetane number, low viscosity and high oxygen content, is often used as a fuel additive. In this study, PODE is blended with biodiesel as a major components of the fuel to improve the low-temperature flow properties and the viscosity of biodiesel, aiming to achieve superior engine...
A reduced 11-component (n-heptane, iso-octane, toluene, ethanol, methanol, n-decane, n-dodecane, n-hexadecane, diisobutylene, cyclohexane and methyl-cyclohexane) chemical mechanism consisting of 178 species and 758 reactions is proposed for combustion and soot formation predictions of wide distillation fuel (WDF) covering gasoline, jet and diesel fuels. Six different classes of hydrocarbons (straight...
Partially Premixed Compression Ignition (PPCI) and Multiple Premixed Compression Ignition (MPCI) are two high efficiency and clean combustion strategies. This paper presents an experimental investigation on the efficiency of PPCI and MPCI combustion using five gasoline-like fuels: gasoline, gasoline/ethylhexyl-nitrate (EHN) blends, gasoline/diesel blends, gasoline/polyoxymethylene dimethyl ethers...
In this study, the spray characteristics of a five-hole gasoline direct injector were investigated in a constant volume vessel. The absolute ambient pressure ranged from 0.5 to 10.0bar, and the fuel temperatures were 20°C and 80°C. High-speed imaging and phase Doppler measurement technique were utilized to investigate the spray morphology and the droplet dynamics, respectively. Spray collapses were...
Recently the performance of dual fuel strategy on multi-cylinder engines over the whole engine map has received increasing attention. This research focuses on the potential of Homogeneous Charge Induced Ignition (HCII) combustion fueled with gasoline and diesel meeting Euro V emission standard through the whole operating range using a simple after-treatment system. This combustion mode utilizes a...
The flash boiling sprays in a single-cylinder optical gasoline direct injection (GDI) engine were studied using phase Doppler particle analyzer (PDPA) and high-speed photography. Initially, the factors which may influence the in-cylinder measurement reliability of PDPA were carefully examined under atmospheric conditions. Afterwards, engine experiments were conducted under idle and wide open throttle...
A generalized research octane number (GRON) model, including 22 species and 21 reactions, has been developed to simulate the hydrocarbon oxidation with the goal of predicting engine knock. The simplicity of the model enables to represent gasoline with different octane numbers by adjusting the global low-temperature reaction rate. The model was validated against shock tube experimental data obtained...
Compared to natural gas spark-ignition (SI) combustion, dual-fuel (DF) mode could achieve higher indicated thermal efficiency (ITE). The major disadvantages of natural gas DF combustion are rough combustion at high load, high CO and total hydrocarbon (THC) emissions, and low natural gas substitution rate. In the present work, a comparison of using polyoxymethylene dimethyl ethers (PODEn) and diesel...
GDP is a blend fuel containing gasoline, diesel, and polyoxymethylene dimethyl ethers (PODE). Previous study has shown that by combining premixed ratio and high fuel oxygen content, GDP partially premixed combustion ignition (PPCI) broke the trade-off between NOx and soot with moderate exhaust gas recirculation (EGR) while maintaining high engine efficiency. In this work, multiple premixed compression...
Polyoxymethylene dimethyl ethers (PODE) are a promising alternative fuel for diesel engines. PODE have high volatility, high ignitability and high oxygen content, and is thus also an ideal additive fuel for blend and dual-fuel combustion due to its low-temperature chemistry. In this work, the characteristics of PODE homogenous charge compression ignition (HCCI) combustion are investigated for the...
To understand soot formation in a diesel engine fueled with different biodiesels, a numerical study was performed using the KIVA-3V code, combined with a multi-step phenomenological soot model. The simulations were used to predict differences in soot formation for three various biodiesel feedstock types. Good agreements on soot emissions were achieved in comparisons of engine experiments and simulations...
This experimental work systematically compares the stoichiometric alcohol–gasoline and gasoline–alcohol Dual-Fuel Spark Ignition (DFSI) combustion for engine particle number (PN) reduction and fuel economy improvement using a high compression ratio gasoline engine. Alcohol–gasoline DFSI is based on port fuel injection (PFI) of alcohols with high oxygenated content, high octane number and high latent...
This paper investigates an experimental study of Alcohols–gasoline Dual-Fuel Spark Ignition (DFSI) Combustion for knock suppression and high fuel efficiency using a gasoline engine with high compression ratio. Alcohols–gasoline DFSI is organized using a port-fuel-injection (PFI) of high oxygenated, high latent heat and high octane number fuel to suppress knock and a direct injection (DI) of high energy...
Pentanol is one of the next generation biofuels that could potentially help relieve the energy crisis and environmental problems. The objective of this study is to reveal the effects of pentanol addition to diesel and biodiesel fuels in different ratios on the combustion and emission of a single-cylinder direct-injection diesel engine. The tests were conducted at a constant speed (1600r/min) under...
Occurrence of sporadic super-knock is the main obstacle in the development of advanced gasoline engines. By utilizing a rapid compression machine, events of pre-ignition and super-knock in a closed system under high temperature and high pressure were captured by synchronous high-speed direct photography and pressure measurement, with the results demonstrating that the mechanism of super-knock is constituted...
A novel fuel named the Full Distillation Fuel (FDF) is proposed in this paper to lower the full life-cycle cost of the end use of petroleum-based fuels and reduce emissions. FDF is a liquid fuel and its distillation temperature range covers gasoline, kerosene and diesel fuel. There is no need to employ different distillation and refinery processes to produce gasoline and diesel fuels; instead, a single...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.