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  • 1
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    In:  Other Sources
    Publication Date: 2011-08-24
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: Journal of Propulsion and Power (ISSN 0748-4658); 8; 425-431
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  • 2
    Publication Date: 2011-08-19
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: AIAA Journal (ISSN 0001-1452); 28; 267-275
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  • 3
    Publication Date: 2011-08-24
    Description: The approach currently being developed at the NASA Lewis Research Center to address the issues of high-fidelity propulsion systems computational simulations is discussed. The approach focuses on interdisciplinary analysis, system simulation, simulation environment, and parallel computing. The Numerical Propulsion System Simulation is a long range program with the ultimate goal of developing the capability to reduce the cost and time of developing advanced technology propulsion systems.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: Computing Systems in Engineering (ISSN 0956-0521); 2; 4, 19
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  • 4
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    In:  Other Sources
    Publication Date: 2011-08-19
    Description: Research on combustion is being conducted at Lewis Research Center to provide improved analytical models of the complex flow and chemical reaction processes which occur in the combustor of gas turbine engines and other aeropropulsion systems. The objective of the research is to obtain a better understanding of the various physical processes that occur in the gas turbine combustor in order to develop models and numerical codes which can accurately describe these processes. Activities include in-house research projects, university grants, and industry contracts and are classified under the subject areas of advanced numerics, fuel sprays, fluid mixing, and radiation-chemistry. Results are high-lighted from several projects.
    Keywords: AIRCRAFT PROPULSION AND POWER
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  • 5
    Publication Date: 2011-08-19
    Description: The vortical evolution of mixing layers subject to various types of forcing is numerically simulated using pseudospectral methods. The effect of harmonic forcing and random noise in the initial conditions is examined with some results compared to experimental data. Spanwise forcing is found to enhance streamwise vorticity in a nonlinear process leading to a slow, secondary growth of the shear layer. The effect of forcing on a chemical reaction is favorably compared with experimental data at low Reynolds numbers. Combining harmonic and subharmonic forcing is shown to both augment and later destroy streamwise vorticity.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: Computers and Fluids (ISSN 0045-7930); 17; 2, 19; 301-312
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  • 6
    Publication Date: 2011-08-19
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: Journal of Propulsion and Power (ISSN 0748-4658); 1; 270-278
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  • 7
    Publication Date: 2016-06-07
    Description: Spectral and total flame radiation measurements exhibited: (1) that radiant heat flux increases with vision combustor inlet air pressure; (2) the effect of fuel atomization characteristics on radiant heat flux; and (3) that a reduction in fuel hydrogen content produces a significant increase in radiant heat flux primarily at low combustor pressures.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: Combust. Fundamentals Res.; p 199-206
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  • 8
    Publication Date: 2016-06-07
    Description: A series of progressively finer grid systems to calculate the single jet in cross-flow experimentally measured were employed. The experimental measurements provide a collection of velocities, turbulence intensities, and jet concentration profiles with measurements of the inlet field. The use of a series of progressively finer grid systems allows a differentiation between numerical errors and the hydrodynamic modeling assumptions embodied in the 3D combustor code.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: Combust. Fundamentals Res.; p 93-100
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  • 9
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    In:  CASI
    Publication Date: 2016-06-07
    Description: Three dimensional combustor calculations are currently stretching the computer hardware capabilities and the computing budgets of gas turbine manufacturers. One of the main reasons for this relates to the large number of complex physical processes occurring in the combustor. Airflow, fuel spray, reaction kinetics, flame radiation, and not the least of which, turbulence must be modeled and the related differential equations solved. Discussions in this conference will address methods to improve the accuracy of combustor flow field calculations and methods to speed the convergence of the modeled equations. This report will focus on aspects of merging these two new technologies. The improved accuracy discretization schemes have a negative impact on the speed of convergence of the modeled equations that the improved solution algorithms may not overcome. A description of the causes of this problem and potential solutions will be examined.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: Combust. Fundamentals Res.; p 97
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  • 10
    Publication Date: 2019-06-28
    Description: A series of large eddy simulations are made of a forced shear layer and compared with experimental data. Several mesh densities were examined to separate the effect of numerical inaccuracy from modeling deficiencies. The turbulence model that was used to represent small scale, 3-D motions correctly predicted some gross features of the flow field, but appears to be structurally incorrect. The main effect of mesh refinement was to act as a filter on the scale of vortices that developed from the inflow boundary conditions.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-TM-102129 , E-4844 , NAS 1.15:102129
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