Statistics – Applications
Scientific paper
Jan 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994phdt........23d&link_type=abstract
Thesis (PH.D.)--OKLAHOMA STATE UNIVERSITY, 1994.Source: Dissertation Abstracts International, Volume: 55-11, Section: B, page: 4
Statistics
Applications
Scientific paper
Scope and method of study. The primary objective of this study was to develop a general primitive, pressure -velocity variable, finite difference computer code to predict turbulent swirling reacting flows in a practical axisymmetric combustor domain. Turbulence is simulated via the two equation k-varepsilon model, and combustion is simulated with one-step, two-step or four -step reaction schemes from user-oriented accuracy and complexity requirements based on the Arrhenius and Eddy-Breakup concepts. Four applications of the developed code are considered: (a) Nonreacting flow predictions with various inlet velocity profiles, (b) Inlet design parameter effects on nonreacting flowfields, (c) Inlet design parameter effects on reacting flowfields, and (d) Reacting flow predictions with three kinetic reaction schemes. Dramatic effects for each application are illustrated with profiles and/or contour plots, and results are assessed versus comparison with available experimental data. Findings and conclusions. Major conclusions are: (a) A general computer code has been developed for turbulent swirling reacting flow predictions. The new code is named REFINED (acronym for _ R eacting _ Elliptic _ Flows _ IN _ Expansion _ Domains). A variety of user's choices, such as inlet velocity profiles, inlet flow parameters, chemical reaction schemes from user -oriented accuracy and complexity requirements, and interaction with flowfield color graphic display utility are included. Predicted results exhibit qualitatively good agreement with available experimental data. (b) Measured inlet velocity components should be used to obtain most realistic predictions of combustor flowfields. (c) Measured inlet velocity components should be used in turbulence modeling development, in order that errors arising from incorrect inlet flow specification do not lead to erroneous conclusions. (d) Dramatic effects of the influential inlet design parameters on both nonreacting and reacting flowfields are demonstrated. (e) Both the two-step and four-step reaction schemes show promise for application in gas turbine combustors, but they need to be further validated with simple flames to establish universal model constants and rate constants, so that major species in combustion flowfields can be accurately predicted.
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