... variations in dual fuel combustion are analyzed, comparing diesel – natural gas (NG) and polyoxymethylene dimethyl ether (POMDME) – NG dual fuel combustion. Cyclic variability was initially quantified using the coefficient of variation (COV) of IMEPg computed from experimental cylinder pressure data...

... Abstract Conventional dual-fuel combustion (DFC) has been studied for decades due to its ability to produce high fuel conversion efficiency and its potential to defeat the well-known diesel NOx-PM trade-off. In DFC, a low-reactivity fuel (LRF) such as natural gas is premixed with air...

... the fundamental rovibrational absorption lines of carbon monoxide and nitric oxide near 5 μm in wavelength. The sensor module was integrated into a commercial EPA-certified natural gas spark-ignition generator operated at 3,300 rpm for measurements of exhaust pulse temperature, CO, and NO concentrations at a rate...

... with high methane content. Relative to natural gas-fueled engines, the power densities of premixed or port-fuel-injected hydrogen engines are limited due to low volumetric efficiencies and moreover by occurring irregular combustion events (knocking, backfire). The paper presents results from experimental...

... autoignition fraction for stoichiometric natural gas/oxidizer/EGR blends. Natural gas with a range of chemical reactivity was simulated using mixtures of CH 4 , C 2 H 6 , and C 3 H 8 . Reactive exhaust gas recirculation (R-EGR) gases were simulated with mixtures of Ar, CO 2 , CO, and NO and non-reactive...

... Abstract Natural gas is known as a relatively clean fossil fuel due to its low carbon to hydrogen ratio compared to other transportation fuels, which yields a reduction of carbon monoxide, carbon dioxide, and unburned hydrocarbons emissions. However, it has a low cetane number, which makes...

... Abstract Exhaust gas recirculation (EGR) in spark-ignited engines is a key technique to reduce in-cylinder NOx production by decreasing the combustion temperature. The major species of the exhaust gas in rich combustion of natural gas are hydrogen and carbon monoxide, which can subsequently...

... 08 07 2010 Homogenous Charge Compression Ignition (HCCI) combustion is a promising concept to reduce engine emissions and fuel consumption. In this paper, a thermo-kinetic model is developed to study the operating characteristics of a natural gas HCCI engine. The zero-dimensional...

... 19 11 2008 CFD Modeling of the injection, the mixing, the combustion and the emission formation processes in a high pressure direct injection (HPDI) natural gas engine is presented in this paper. KIVA3V was used together with an injector model. Two sub-models had been developed...