... air and water as the fluid medium and not hydrogen. This validation test is set at ambient temperature and not cryogenic temperatures. Also, the valuation case is for a pure substance and not an entrained or mixed fluid. Previous studies showed that the CFD model presented in this study showed a worst...

... are usually focused on the optimization of the swirler aerodynamics and the fuel-air mixing. Since the method solely relies on nonreacting tests of burner models in the water channel, it can be applied before any test equipment for combustion experiments exists. In order to achieve optimum similarity of fuel...

.... Recognizing that poor fuel-air mixing leads to increased emissions, it is therefore imperative to characterize the extent of fuel-air mixing at the exit of the multihole tube. In the present investigation, mixing characterization experiments were conducted by mapping the distribution of fuel-air equivalence...

... body, which energizes the diffusion and mixing process. 07 06 2008 15 10 2008 22 05 2009 combustion damping diffusion flames flow instability fluid oscillations mixing pipe flow vortices wakes combustion instability bluff body stabilization diffusion flames...

... simulation numerical analysis two-phase flow tight lattice interface tracking cross flow mixing differential pressure In what follows, the evaluation method for the pressure drop shown in this study will be first compared with the simulations results of the pressure drop distribution...

...D. J. Beerer; V. G. McDonell With the need to reduce carbon emissions such as C O 2 , hydrogen is being examined as potential “clean” fuel for the future. One potential strategy is lean premixed combustion, where the fuel and air are allowed to mix upstream before entering the combustor, which has...

...) and, by decoupling chemistry with mixing, provides an unambiguous data interpretation for kinetics study. The soot evolution was studied by the line-of-sight absorption method (at 632.8 nm ), which measured the soot volume concentration evolution in the initial stage of soot growth before the optical path became...

...J. Fritz; M. Kro¨ner; T. Sattelmayer Flame flashback from the combustion chamber into the mixing zone is one of the inherent problems of lean premixed combustion and essentially determines the reliability of low NO x burners. Generally, flashback can be initiated by one of the following four...

...J. Becker; C. Hassa Fuel placement and air-fuel mixing in a generic aeroengine premix module employing plain jet liquid fuel injection into a counter-swirling double-annular crossflow were investigated at different values of air inlet pressure (6 bar, 700 K and 12 bar, 700 K) and liquid-to-air...

... on the effect of different intensities of turbulent mixing on the combustion is performed. This study reveals that the ignition delay is a function of turbulent mixing of the hot bulk and the colder boundary layer. The efficiency of the HCCI engine has previously been shown by a number of experiments...

...K. Sone; S. Menon Fuel-air mixing in a direct injection spark ignition (DISI) engine occurs in a highly unsteady, turbulent and three-dimensional flow. As a result, any cycle-to-cycle unsteady variation in the mixing process can directly impact the performance of the DISI engine. To study...

... internal combustion engines hydrogen fuel mixing ignition combustion pressure optimisation Hydrogen is a “clean burning” fuel and has the features of a carbon-free fuel. Its combustion products are mainly water. It produces no toxic components such as hydrocarbons, carbon monoxide, carbon...

... distribution in the high squish combustion chamber on the history of heat release rates because the fuel distribution greatly affects the fuel-air mixing and formation of exhaust emissions. This study tries to find the optimum mixture distribution for the low-emission DI diesel engine and introduce measures...

.... 9 Schematic diagram of experimental facility The schematic diagram of the test facilities is shown in Fig. 9 . The raw fuel obtained by mixing CO 2 and steam with gaseous propane was decomposed to CO and H 2 inside the fuel reforming device. A hydrogen separation...

..., final revision, Mar. 2001. Associate Editor: R. Natole. 04 June 2001 01 Dec 2000 01 Mar 2001 27 12 2002 aerospace engines aerospace propulsion gas turbines nozzles combustion detonation fuel mixing Current Air Force planning activities indicate...

...D. Brasoveanu; A. K. Gupta, Professor and Director A unified model of gaseous fuel and air mixing is applied here to study the use of shock waves for enhancement of mixing between methane and air. The model uses fuel mass fraction within infinitesimal fluid elements and the total derivative...

... Headquarters July 2002. Associate Editor: P. Malte. 01 Aug 2001 01 July 2002 27 12 2002 flames combustion gas mixtures pattern classification chemically reactive flow temperature distribution stability mixing The interest in low NO x combustion originates...

...O. Diers; J. Koopman; M. Fischer; C. Hassa To support the development of a rich quench lean pilot zone for a staged aeroengine combustor, two rectangular rich quench lean (RQL) combustor sectors have been investigated under atmospheric conditions. Two advanced cooling mixing concepts, effusion...

... of hundreds of reactions and species and is derived from fundamental flame chemistry. Effects of turbulent mixing on the reaction rates were also considered. The results show that the present KIVA/CHEMKIN model is able to simulate the ignition and combustion process in three different HCCI engines including...

... in the device to allow exploration and evaluation of fuel distribution effects in addition to chemistry effects. Gas blends reflecting the extremes in compositions found in the U.S. are considered. The results illustrate that, for the conditions and configuration studied, both fuel chemistry and fuel air mixing...