CRS4 Report

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https://hdl.handle.net/11050/59
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Mostra il contenuto di CRS4 Report per Autore "Barbato, Maurizio"

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    BRITE-euram LowNOx III. Theme V, task 2: reduced reaction mechanisms: CRS4 final deliverable
    (1999-12) Barbato, Maurizio
    The present documents reports about CRS4 activity for the task 2 of the theme V of the LowNOx III project. In this chapter a summary of what has been done at CRS4 during this time is presented. In the following chapters a description of the physical models and computational tools used for the calculation is done. In chapter 2 the combustion model specially implemented to afford calculation of combustion flows in different combustion regimes is presented. Chapter 3 and 4 concern the combustion model validation. Chapter 5 and 6 present ILDM and classical approaches to reduced chemistry. ILDM software testing is proposed in chapter 7. A simple application of Combustion model package EDC+PSR, developed for the CFX code, is presented in chapter 8. Finally a series of appendixes gives the necessary documentation for the EDC+PSR software package.
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    Model for heterogeneous catalysis on metal surfaces with application to hypersonic flows
    (1999) Barbato, Maurizio; Reggiani, S.; Bruno, Claudio; Muylaert, J.
    A model for heterogeneous catalysis for Copper, Nickel, and Platinum has been devised. The model simulates the heterogeneous chemical kinetics of dissociated air flow impinging metal surfaces. Elementary phenomena such as, atomic and molecular adsorption, Eley-Rideal and Langmuir-Hinshelwood recombinations, and thermal desorptions have been accounted for. Comparisons with experimental results for Nitrogen and Oxygen recombination show good agreement. In the second part of this work, the finite rate catalysis model has been used to analyzed numerically the problems of the heterogeneous catalysis similarity between hypersonic ground testing and reentry flight. Therefore the flow around a blunt cone under these conditions has been calculated and results for heat fluxes and for a suggested similarity parameter have been compared and discussed.
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    Numerical simulation of premixed combustion flows: a comparative study
    (1999) Barbato, Maurizio; Talice, Marco; Zimont, Vladimir L.
    In this work four different commercial and research CFD codes have been compared for the simulation of two combustion test cases. The aim was to get an overview of the capabilities of these different tools to simulate combustion flows in premixed regimes. Codes tested were Fluent, CFX, StarCD and Tanit. Three combustion models have been applied, namely the Eddy Break Up, the Eddy Dissipation Model and the Turbulent Flame Closure, the turbulence model used being the standard k-epsilon. Numerical results have been found to fairly fit experiments and helped to show some drawbacks of combustion models. In its theoretically correct range of applicability the TFC model has been found to give the better agreement with experiments.
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    Numerical simulations of a premixed experimental combustor
    (1998) Barbato, Maurizio
    This report presents results of computational simulations of a premixed combustion flow in an experimental plane combustor. In Chapter 1 a brief description of the test case and of flow main characteristics are given. Results obtained from computations are compared each others and with experimental results in Chapter 2. Finally, results are discussed and conclusions on results quality are drawn.
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    On the limits of industrial premixed combustion simulation
    (1999) Zimont, Vladimir L.; Barbato, Maurizio
    This work analyses the simulation potential of two premixed turbulent combustion models based on different combustion mechanism concepts: the Eddy Dissipation Concept based on the volume combustion mechanism, and the Turbulent Flame-speed Closure based on the thickened-wrinkled amelets combustion mechanism. Ability of simulating numerically a standard experimental test case (premixed methane-air combustion in a plane channel at high flow velocity) and the influence of flow parameters variation on the combustion process have been tested. The paper shows that the flamelets model describes the standard experimental data more accurately. Furthermore, comparisons of the two models results obtained varying combustion flow parameters show the presence of quantitatively, and in one case even qualitatively different trends. These results are explained, and potentialities and limits of these models are discussed from an industrial premixed burner applications standpoint.