... at early injection timings, which has not been observed in large-bore engines operating under RCCI at similar conditions. In this work, computational fluid dynamics (CFD) simulations were performed to investigate whether spray–wall interactions could be responsible for this result. Comparison of the spray...

... impingement of the diesel spray on the gas injector tip. Temporal overlap is varied by shifting the start of injection (SOI) of natural gas while keeping the diesel injection timing constant for unaltered ignition conditions. The gas SOI is therefore given with respect to the pilot SOI. All other injection...

... technology Sprays Swirling Steady liquid fuel combustion is commonly used in boilers, furnaces, and gas turbines. The emission regulations continuously lower the allowed concentration of pollutants, emphasizing nitrogen oxides (NO x ). This limitation used to be commonly fulfilled by injecting...

... Sprays Two-phase Visualization Wear The change in energy production from fossil fuels to renewable sources results in a fluctuation of the produced electric energy. To ensure grid stability, a higher flexibility of conventional power plants is getting more and more important. For gas turbine...

... and temperature. The study reveals that the quality of the diesel pilot ignition in terms of short ignition delay and a high number of ignited sprays significantly depends on the injection parameters and operating conditions. In most cases, the pilot fuel suffers from too high dilution due to its small quantity...

... with the catalyst was identified as the critical process driving the susceptibility to deposit formation. The spray of urea solution was characterized in terms of velocity distribution by means of particle-image velocimetry. Results were compared with theoretical predictions and calculation options for processes...

.... Editor: David Wisler. This work is in part a work of the U.S. Government. ASME disclaims all interest in the U.S. Government's contributions. 03 11 2017 26 02 2018 Combustion Droplet Engines Evaporation Flame Fuel combustion Power systems Sprays Thermodynamics Vaporization...

...Aron P. Dobos; Allan T. Kirkpatrick This paper studies the differences in spray structure and emissions trends between diesel and biodiesel fuels in a compression ignition engine. A computationally efficient and predictive quasi-dimensional simulation model is combined with fuel-specific physical...

... approach is able to predict the main characteristics of the flame with a good agreement with the experiment in terms of flame shape, spray characteristics and soot location. Finite-rate chemistry effects appear to be very important in the region close to the injection location leading to the lift-off...

... technology Internal flow Measurement techniques Multiphase flows Natural gas technology Sensors Sprays Temperature Two-phase Visualization The use of compressors in more extreme environments, such as subsea applications, has increased interest in wet gas compression in the oil and gas...

... in the measured data. To get a close insight into the emission formation processes in water-injected flames, local concentration measurements are used to calculate distributions of the reaction progress variable. Finally, to clarify the influence of spray quality on the composition of the exhaust gas, a variation...

... are considered. First, capabilities of FGM are evaluated on a single swirler burner operating at ambient pressure with a standard pressure atomizer for spray injection. Then, a second test case, operated at 4 bar, is simulated. Here, kerosene fuel is burned after an injection through a prefilming airblast...

...Brian T. Fisher; Michael R. Weismiller; Steven G. Tuttle; Katherine M. Hinnant In order to understand the reasons for the apparent benefits of using a flow-blurring (FB) atomizer in a combustion system, it is necessary to first examine fundamental spray characteristics under nonreacting conditions...

...Kevin Prieur; Daniel Durox; Thierry Schuller; Sébastien Candel This article reports experiments carried out in the MICCA-spray combustor developed at EM2C laboratory. This system comprises 16 swirl spray injectors. Liquid n-heptane is injected by simplex atomizers. The combustion chamber is formed...

.... 07 07 2017 12 07 2017 Droplet Evaporation Fuels Sprays Combustion In recent years, the need to reduce the reliance on fossil fuels for energy production and transportation contributes to an ever increasing interest in biofuels [ 1 ]. At the same time, the current...

... ignition are addressed in the present work. Two facilities enable the analysis of two characteristic phases of the process. The knowledge for ignition, acoustics and instabilities (KIAI)-Spray single-injector burner was investigated in terms of local flow properties, including the air velocity and droplet...

...-pass filter character of the prefilming airblast atomization phenomenon, which also introduces a significant phase shift on the dynamics of SMD of the generated spray. The models are tested in their original formulations without any calibration in order to assess their robustness versus different...

... approach for diesel engine applications is a multizone spray and combustion model pioneered by Hiroyasu and his group. It divides diesel spray into packets and tracks fuel evaporation, air entrainment, gas properties, and ignition delay (induction time) individually during the injection and combustion...

... of the average soot temperature and KL factor images keeps the same as that of an individual image, which further confirms the repeatable spray combustion measurement in this study. The implementation of two-color pyrometry was described in detail in Ref. [ 41 ]. A brief summary is presented here. Soot...

... control parameters can be concluded as follows: SOI: Poor mixture homogeneity from late injection is not desirable for PM suppression. In comparison, early injection can provide more homogeneous mixture but with the risk of fuel impingement due to the increased spray penetration (lower ambient...