...Florian Lang; Maximilian Savtschenko; Vikas Yadav; Abdulla Ghani Prediction of successful ignition is a challenging task that requires knowledge of the local thermochemical state in highly turbulent flow conditions. For typical industrial gas turbine (GTs) conditions operated on active service...

... and fundamental combustion properties, here ignition delay time and laminar flame speed, were accurately predicted. Through rate of production and sensitivity analyses of the mechanism, nine reactions were identified to have a strong impact on the (over) prediction of the PAHs. These reactions have been modified...

...Vyaas Gururajan; Riccardo Scarcelli; Sayan Biswas; Isaac Ekoto Recent interest in nonequilibrium plasma discharges as sources of ignition for the automotive industry has not yet been accompanied by the availability of dedicated models to perform this task in computational fluid dynamics (CFD...

... m-xylene mechanism correctly predicts ignition delay times at different pressures and temperatures as well as laminar burning velocities at atmospheric pressure and various fuel equivalence ratios. At high pressure, some deviations of the calculated laminar burning velocity and the measured values...

...Vyaas Gururajan; Riccardo Scarcelli; Anand Karpatne; Douglas Breden; Laxminarayan Raja; Sayan Biswas; Isaac Ekoto Nanosecond pulsed discharges have attracted the attention of engine manufacturers due to the possibility of attaining distributed ignition sites that accelerate burn rates while...

... are evaluated. The ignition and lean blow-out (LBO) results show that the baseline injector exhibits excellent combustion stability, while the coswirling design holds the highest ignition and LBO fuel–air ratio (FAR). In order to find out the physical mechanisms dominating the ignition and LBO processes...

... of methane, become more important. The ignition delay times of the fuel/oxygen/argon mixtures ( φ  = 0.5 and 1.0 (O 2 )/(Ar) = 21 vol. %/79 vol. %) were measured at a dilution of 1:5 (20% mixture/80% Ar) at pressures of about 4 bar. Additional measurements at a dilution of 1:10 and 1:20 (wood...

... received October 1, 2012; published online January 10, 2013. Editor: Dilip R. Ballal. 24 09 2012 01 10 2012 The work presented in this paper intends to deepen our understanding of the mechanisms involved in the spark ignition of liquid fuel sprays. An experimental study is presented...

... . Manuscript received July 23, 2012; final manuscript received August 1, 2012; published online November 30, 2012. Editor: Dilip R. Ballal. 23 07 2012 01 08 2012 This paper contains a numerical examination concerning the ignition behavior of a spray nozzle mounted in a rectangular channel...

...Henrik Hesse; Sean P. Malkeson; Nilanjan Chakraborty The statistics of the density-weighted displacement speed of the reaction progress variable c isosurfaces for stratified mixture combustion arising from localized ignition in a turbulent planar coflowing jet have been studied based on 3D Direct...

...Cosmin E. Dumitrescu; W. Stuart Neill; Hongsheng Guo; Vahid Hosseini; Wallace L. Chippior An experimental study was performed to investigate fuel property effects on premixed charge compression ignition (PCCI) combustion in a heavy-duty diesel engine. A matrix of research diesel fuels designed...

..., autoignition can be observed in the simulations. Influences of the turbulence modeling as well as of the hot flue gas temperature are investigated. The onset and the propagation of the ignition kernels are studied based on the SAS modeling results. The obtained numerical results are discussed and compared...

... to a reduction of the highest possible H 2 concentration without “flame-stabilizing autoignition kernels” of approximately 16 vol. %. Furthermore, the onset and propagation of the ignition kernels were elucidated using the high-speed measurements. It was found that the ability of individual autoignition kernels...

... temperature, causing significant changes in ignition delay. These changes were compensated for in the experiments by increasing intake temperature but would be challenging to manage in transient engine operation. Second, the increased water concentration in the exhaust created difficulties in the exhaust...

... of ignition delay, flame speed and extinction strain rate, as well as species composition in stirred reactors, flames and flow reactors. The range of conditions covers low to high temperatures, very lean to very rich fuel-air ratios, and low to high pressures. Our core reaction mechanism contains...

... on the ignition delay, premixed combustion fraction and mixing and diffusion controlled combustion fractions. Biodiesel produced the largest diffusion controlled combustion fraction at all injection pressures compared to ULSD and JP-8. At 600 bar injection pressure, the diffusion controlled combustion fraction...

...B. B. Sahoo; U. K. Saha; N. Sahoo Syngas, an environmentally friendly alternative gaseous fuel for internal combustion engine operation, mainly consists of carbon monoxide (CO) and hydrogen (H 2 ). It can substitute fossil diesel oil in a compression ignition diesel engine through dual fuel...

...Sreenath B. Gupta; Bipin Bihari; Munidhar Biruduganti; Raj Sekar A single-cylinder natural gas fueled engine equipped with an exhaust gas recirculation (EGR) system was ignited using a laser. The broadband emission from the spark kernel was spectrally resolved, and the peaks corresponding to H α...

... charge compression ignition (HCCI) engine fueled with n-heptane. The engine was operated with four fuel blends containing up to 50% iso-octane by liquid volume at 900 rpm, 50:1 air-to-fuel ratio, no exhaust gas recirculation, and an intake mixture temperature of 30 ° C . A detailed analysis...

...Mirko Baratta; Andrea E. Catania; Alessandro Ferrari; Roberto Finesso; Ezio Spessa A new multizone premixed-diffusive combustion model has been developed, assessed, and applied to diagnose the burning process and emission formation in a conventional and in a premixed charge compression ignition...