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Water vapor dilution has great impact on fundamental combustion processes such as ignition, flame propagation and extinction. In the literature, there are many studies on how water vapor addition affects flame propagation and extinction limit. However, the influence of water vapor addition on ignition receives little attention. In this study, numerical simulations considering detailed chemical mechanisms...
The laminar flame speed is one of the most important combustion properties of a combustible mixture. It is an important target for chemical mechanism validation and development, especially at fuel-lean and high pressure conditions. In this study, the laminar flame speeds of two types of lean high-hydrogen syngas/oxygen/helium mixtures were measured at normal and evaluated pressures up to 10atm using...
Numerical simulations of one-dimensional planar and spherical flame propagation of iso-octane/hydrogen/air mixtures at different equivalence ratios and hydrogen blending levels are conducted considering detailed chemistry. Our focus is on the effects of hydrogen addition on laminar flame propagation and ignition of iso-octane/air mixtures. Specifically, the laminar flame speed, Markstein length, and...
Laminar flame speeds and Markstein lengths of H2/CO with CO2 dilution were measured at normal and elevated pressures (0.1MPa, 0.5MPa, 1.0MPa) and temperatures (298K, 375K, 450K) using outwardly propagating spherical flame method. Simulation considering detailed chemistry and transport was conducted to examine the effects of radiation re-absorption of CO2 dilution on flame propagation. The laminar...
Synthetic gas, or syngas, is a popular alternative fuel for gas turbine industry. However, the composition of syngas is complex which complicates the combustor design. In this study, a dual-chambered pressure-release type combustion apparatus was developed and used for measurements of laminar flame speed which could be operated at high pressures and temperatures. The laminar flame speeds of syngas...
Premixed and non-premixed ignition of methane/hydrogen and methane/dimethyl ether (DME) binary fuel blends with hot air is studied through numerical simulation with detailed chemistry and variable thermodynamic and transport properties. The emphasis is spent on assessing the kinetic and transport effects involved in CH 4 ignition enhancement caused by H 2 and DME addition. Two configurations...
The controlling strategies of homogeneous charge compression ignition (HCCI) fueled by dimethyl ether (DME) and methanol were investigated. The experimental work was carried out on a modified single-cylinder diesel engine, which was fitted with port injection of DME and methanol dual fuel. The results show that exhaust gas recirculation (EGR) rate and DME percentage are two important parameters to...
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