No abstract available

No abstract available

[en] The Combustion Corridor is a concept in which researchers in combustion and thermal sciences have unimpeded access to large volumes of remote computational results. This will enable remote, collaborative analysis and visualization of state-of-the-art combustion science results. The Engine Research Center (ERC) at the University of Wisconsin - Madison partnered with Lawrence Berkeley National Laboratory, Argonne National Laboratory, Sandia National Laboratory, and several other universities to build and test the first stages of a combustion corridor. The ERC served two important functions in this partnership. First, we work extensively with combustion simulations so we were able to provide real world research data sets for testing the Corridor concepts. Second, the ERC was part of an extension of the high bandwidth based DOE National Laboratory connections to universities

[en] A study was conducted at the Alberta Research Council aimed at developing equations to obtain the combustion efficiencies of solution gas flaring. Flaring of waste gas is commonly practiced by the petroleum industry in Alberta. Flaring rarely reaches complete combustion because air entrainment restricts flame sizes to less than optimum values. Equations were used to estimate flame lengths, areas and volumes of functions of flare stack exit velocity, stoichiometric mixing ratio and wind speed. Heats released were estimated from knowledge of the flame dimensions. The study showed that combustion efficiency quickly decreases as wind speed increases from 1 to 6 m/s. Combustion efficiencies were found to level off at values between 10 to 15 per cent when wind speeds were beyond 6 m/s. Propane and ethane burned more efficiently than methane or hydrogen sulphide. 23 refs., 4 tabs., 1 fig., 1 appendix

No abstract available

[en] For over half a century, combustion researchers have studied the phenomenon of Deflagration-to-Detonation Transition (DDT). DDT phenomenon lies at the intersection of chemical kinetics, flow turbulence and compressible gas dynamics; and presents a formidable and challenging conundrum. In the nuclear industry, DDT is a known risk in accident scenarios involving unintended release and combustion of hydrogen. Through use of sophisticated measurements, experimentalists have clearly elucidated the mechanisms underlying DDT. More recently, numerical modeling has also been adopted as one of the methods for studying DDT. In this article, the multitude of effects involved in DDT have been presented from a physical standpoint. Then, numerical challenges and strategies to model DDT are described along with key validation results. Finally, the mechanistic aspects of DDT are also discussed. (author)

[en] In this paper numerical calculations and analysis on turbulent non-premixed gaseous and spray combustion are reviewed. Attentions were paid to the turbulent flow and combustion modeling applicable to predicting the flow, mixing and combustion of gaseous fuels and sprays. Some of the computed results of turbulent gaseous non-premixed (diffusion) flames with and without swirl and transient spray combustion were compared with experimental ones to understand the processes in the flame and to assure how the computations predict the experiments

[en] In this paper the utilization of a laser for the ignition of gasless combustion reactions is demonstrated. Practical experimental methods and data reduction techniques are discussed

[en] In this paper we outline our solution, of the Cauchy problem, for Majda's model of dynamic combustion, i.e. the system: (u+q_oz)_t+f(u)_χ = 0, z_t+Kφ(u)z = 0, in the class of bounded measurable functions. We define a weak entropy solution for this system, state the uniqueness theorem in this class, and outline the existence proof under the assumption that the initial data is of bounded variation. The existence is proved via the ''vanishing viscosity method''. (author). 3 refs

[en] The Baer-Nunziato multiphase reactive theory for a granulated bed of energetic material is extended to allow for dynamic damage processes, that generate new surfaces as well as porosity. The Second Law of Thermodynamics is employed to constrain the constitutive forms of the mass, momentum, and energy exchange functions as well as those for the mechanical damage model ensuring that the models will be dissipative. The focus here is on the constitutive forms of the exchange functions. The mechanical constitutive modeling is discussed in a companion paper. The mechanical damage model provides dynamic surface area and porosity information needed by the exchange functions to compute combustion rates and interphase momentum and energy exchange rates. The models are implemented in the CTH shock physics code and used to simulate delayed detonations due to impacts in a bed of granulated energetic material and an undamaged cylindrical sample