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Downsizing a spark ignition (SI) engine with boost pressure is a proven way of increasing the thermal efficiency and reducing CO2 emissions. However, the occurrence of abnormal combustion problems such as knock and super knock could seriously damage the downsized SI engine and limit its efficiency improvement. In this study, the effects of the Miller cycle on anti-knock and engine power are experimentally...
As PAHs (Polycyclic Aromatic Hydrocarbons) are the main precursor of soot formation during the combustion, the investigation of PAHs formation is essential for the understanding of the soot formation and soot reduction in combustion. In this study, a specially designed burner and the corresponding fueling system was used to stabilize a laminar diffusion flame of n-heptane up to 3.0bar before it becomes...
The effects of methane addition to PRF95 (primary reference fuel with 95% volume of iso-octane and 5% volume of n-heptane) on the fundamental combustion parameters are experimentally investigated in a cylindrical combustion vessel using classical schlieren technique. In this study, methane is added with three energy fractions of 25%, 50% and 75% to PRF95. The laminar flame propagation, Markstein length...
In present study, a new designed constant volume combustion bomb (CVCB) equipped with an orifice plate and visualized by high speed schlieren photography has been employed to study the turbulent flame propagation effected by flame acceleration in the end gas region. The orifice plate is employed to achieve flame acceleration and obtain different turbulent flames at different equivalence ratios. We...
Detailed kinetic reaction mechanisms are necessary for accurate prediction of combustion characteristics such as ignition and emissions in realistic engines. However, the calculation of chemically reacting flows with detailed chemistry is computational expensive due to the large number of species and reactions involved. In this study, a combined approach of dynamic adaptive chemistry (DAC) and in...
Confronting the situation of environment pollution and energy shortage, direct injection (DI) system has been commonly used in gasoline engines for its good performance in fuel economy, combustion efficiency, emissions and cold-start. Currently, 2-methylfuran (MF) has already been a more attractive biomass fuel in spark ignition (SI) engine, however, there is little knowledge about its spray behaviors...
The possibility to reduce dependence on fossil fuel resources has led to an increasing interest in the use of bio-fuels. This study builds on earlier work on (aromatic) cyclic oxygenates [1,2], but a far wider window of engine operation has been investigated in this paper. Two parametric variations of engine operation were performed and discussed: (1) non-EGR operation by means of varying the load...
Emissions and fuel economy are evaluated for two types of biofuels, namely 2-phenyl ethanol and cyclohexaneethanol. Both are derived from lignin, a form of lignocellulosic biomass. The former and latter oxygenates have an aromatic and aliphatic (i.e. saturated) ring structure, respectively. Two parametric engine sweeps were performed. First, non-EGR operation by means of varying the load via injection...
A subbitumious coal from Erdos, Inner Mongolia, China, was extracted with isometric CS 2 /tetrahydrofuran mixed solvent. The extract was separated by silica-gel column chromatography. A series of long-chain normal alkanes, monoaromatic steranes, polycyclic arenes and heteroatom-containing species in the extract were concentrated to large extents. In addition, abiettriene and retene were separated...
Experimental and two-dimensional numerical investigations on the performance of an inert porous media burner with reciprocating flow are presented. Attention was focused on the combustion temperature and pressure loss in the burner, which was, respectively, packed with 4PPC (Pores Per Centimeter) ceramic foams or alumina pellets with various sizes. Results show that material and structures of porous...
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