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Showing 1 to 14 of 14 for “"Damkohler number"”.
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Experimental investigation of low Damkohler number turbulent reaction
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1995.
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On Determining Spontaneous Ignition in Porous Materials
… theory forms the basis of the approach. The Damkohler number, defined as the dimensionless heat generation parameter for a self-heating body, is described in terms of two key material constants and these materials are related to real incident spontaneous ignition scenarios. The Damkohler …
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Three-Dimensional Numerical Study of Flames Supported by a Rotating Burner
Factors, other than the Damkohler number, that are found to significantly affect the stability of the spinning porous plug burner included the mixture strength and the exit velocity at the burner surface. The range of Damkohler number within which the system exhibits non-uniform behaviour is larger …
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Numerical studies of reactive polymer flows in porous materials
… water). Simulations show that, depending on the Damkohler number, preferential loss of material permeability can occur in either low or high permeability regions. Because this effect dictates subsequent flow patterns, this result suggests that front stability can be controlled through proper …
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The Flame Structure of AP /Htpb Sandwiches
… of the fuel-rich region with increasing Peclet number, predicted by the model, is qualitatively matched by the experimental results. The predicted shrinkage of the fuel-rich region when the binder layer is diluted with fine AP is also qualitatively matched by the experiments. Comparison of the …
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A numerical study of attached oblique detonation
… flows over idealized geometries and infinite Damkohler number (Da), which is the ratio of fluid dynamical to chemical time scales. A multidimensional numerical model is developed, tested against theory, and is then used to investigate the influence of finite Da and viscous flows. Results …
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Investigation on weakly curved counterflow diffusion flames at infinitely fast chemistry
… one-step irreversible reaction model at infinite Damkohler number and constant density is considered. This simplified model is then used to study the distribution of fuel and oxidizer mass fractions, shape of the reaction sheet, and the temperature field. The temperature of the reaction sheet for …
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An Experimental Investigation of Ejector Ramjet Performance at Static Conditions
… jet’s total pressure was increased. The inverse Damkohler number was investigated as a tool for predicting engine blowout and provided improved resolution of the engine’s combustion limits, which could be applied to the 1D-ERAM solver
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A Study of Ion Concentration Fluctuations in Turbulent Diffusion Flames using Correlation Techniques
… a turbulent diffusion flame, of nozzle Reynolds number 1.0 x 10 *4 using a stationary electrostatic probe. The random positive ion saturation current collected by the probe was analysed to determine its auto correlation function. The ionisation field was generated by seeding the flame with …
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Mixing performance of a novel, continuous confined impinging jets mixer using competitive reactions
… of the results based on the use of the Damkohler number is provided.
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Blow-off in gas turbine combustors
… It was found that a correlation based on a Damkohler number does a reasonable job at collapsing the dataset. The final part examines the blow-off behaviour of swirling spray flames for two different fuels: n-heptane and n-decane. The measurements include blow-off limits and their att~mpted …
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Mathematical models of combustion at high pressure
… and location, are determined as a function of Damkohler number and Soret diffusion coefficient. In particular, we find that oxidant is entirely consumed by the flame, while some fuel leaks through. For light fuels, the fuel profile is found to have a local peak on the oxidant side as a result …
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Development of a high power density combustion system for a silicon micro gas turbine engine
… is shown to have a strong correlation with the Damkohler number in the chamber, and asymptotes to unity for sufficiently large values of Da. The maximum power density of the combustor is also shown to be primarily limited by the structural and fabrication constraints of the material. Overall, …
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Effects Of Transport Properties And Flame Unsteadiness On Nitrogen Oxides Emissions From Laminar Hydrogen Jet Diffusion Flames
… this research is to determine how the fuel Lewis number and the flow unsteadiness play a combined role in maximum flame temperature and affect NOx emission from jet diffusion flame. The fuel Lewis number is varied by increasing/decreasing the mole fraction of diluents in the fuel stream. …