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  • 1
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    Numerical simulations of high-speed chemically reacting flow (1994)
    Springer
    Details
    Publication Date: 1994-04-01
    Print ISSN: 0935-4964
    Electronic ISSN: 1432-2250
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Published by Springer
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    PAPER CURRENT
  • 2
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    Mixing enhancement in a lobed injector (1997)
    American Institute of Physics
    Details
    Publication Date: 1997-03-01
    Print ISSN: 1070-6631
    Electronic ISSN: 1089-7666
    Topics: Physics
    Published by American Institute of Physics
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    PAPER CURRENT
  • 3
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    Dynamics of Dusty Gases (1970)
    Annual Reviews
    Details
    Publication Date: 1970-01-01
    Print ISSN: 0066-4189
    Electronic ISSN: 1545-4479
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Published by Annual Reviews
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  • 4
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    Growth of a diffusion flame in the field of a vortex (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: In the present study of the growth of a diffusion flame in the field of a vortex, the motion in the core is converted into a solid body rotation. The flame extension and distortion kinematics are presented, and the effect of the local flow field on local flame structure is analyzed in detail. The combustion field is found to consist of a totally reacted core region whose radius is time-dependent, and an external flame region which consists of a pair of spiral arms that extend at large radii toward their original positions on the horizontal axis. Two similarity rules are formulated which are independent of kinematic viscosity.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Mixing Enhancement in a Lobed Injector (1997)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: An experimental investigation of the non-reactive mixing processes associated with a lobed fuel injector in a coflowing air stream is presented. The lobed fuel injector is a device which generates streamwise vorticity, producing high strain rates which can enhance the mixing of reactants while delaying ignition in a controlled manner. The lobed injectors examined in the present study consist of two corrugated plates between which a fuel surrogate, CO2, is injected into coflowing air. Acetone is seeded in the CO2 supply as a fuel marker. Comparison of two alternative lobed injector geometries is made with a straight fuel injector to determine net differences in mixing and strain fields due to streamwise vorticity generation. Planar laser-induced fluorescence (PLIF) of the seeded acetone yields two-dimensional images of the scalar concentration field at various downstream locations, from which local mixing and scalar dissipation rates are computed. It is found that the lobed injector geometry can enhance molecular mixing and create a highly strained flowfield, and that the strain rates generated by scalar energy dissipation can potentially delay ignition in a reacting flowfield.
    Keywords: Fluid Mechanics and Heat Transfer
    Type: Physics of Fluids (ISSN 1070-6631); 9; 3; 667-678
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    NASA TECHNICAL REPORTS
  • 6
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    Unsteady Flows in Axial Turbomachines (1957)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Of the various unsteady flows that occur in axial turbomachines certain asymmetric disturbances, of wave length large in comparison with blade spacing, have become understood to a certain extent. These disturbances divide themselves into two categories: self-induced oscillations and force disturbances. A special type of propagating stall appears as a self-induced disturbance; an asymmetric velocity profile introduced at the compressor inlet constitutes a forced disturbance. Both phenomena have been treated from a unified theoretical point of view in which the asymmetric disturbances are linearized and the blade characteristics are assumed quasi-steady. Experimental results are in essential agreement with this theory wherever the limitations of the theory are satisfied. For the self-induced disturbances and the more interesting examples of the forced disturbances, the dominant blade characteristic is the dependence of total pressure loss, rather than the turning angle, upon the local blade inlet angle.
    Keywords: Aerodynamics
    Type: O.N.E.R.A. PAPERS PRESENTED AT THE JOURNEES INTERN. DE SCI. AERON., PT. 2 〈1957〈 (SEE N68-81276) P 1-21
    Format: application/pdf
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  • 7
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    Numerical Simulations of High-Speed Chemically Reacting Flow (1994)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The essentially nonoscillatory (ENO) shock-capturing scheme for the solution of hyperbolic equations is extended to solve a system of coupled conservation equations governing two-dimensional, time-dependent, compressible chemically reacting flow with full chemistry. The thermodynamic properties of the mixture are modeled accurately, and stiff kinetic terms are separated from the fluid motion by a fractional step algorithm. The methodology is used to study the concept of shock-induced mixing and combustion, a process by which the interaction of a shock wave with a jet of low-density hydrogen fuel enhances mixing through streamwise vorticity generation. Test cases with and without chemical reaction are explored here. Our results indicate that, in the temperature range examined, vorticity generation as well as the distribution of atomic species do not change significantly with the introduction of a chemical reaction and subsequent heat release. The actual diffusion of hydrogen is also relatively unaffected by the reaction process. This suggests that the fluid mechanics of this problem may be successfully decoupled from the combustion processes, and that computation of the mixing problem (without combustion chemistry) can elucidate much of the important physical features of the flow.
    Keywords: Fluid Mechanics and Heat Transfer
    Type: NASA-CR-203703 , NAS 1.26:203703 , Theoretical and Computational Fluid Dynamics; 6; 161-179
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    Similarity analysis of compressor tip clearance flow structure (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: A new approach is presented for analyzing compressor tip clearance flow. The basic idea is that the clearance velocity field can be (approximately) decomposed into independent throughflow and crossflow, since chordwise pressure gradients are much smaller than normal pressure gradients in the clearance region. As in the slender body approximation in external aerodynamics, this description implies that the three-dimensional steady clearance flow can be viewed as a two-dimensional, unsteady flow. Using this approach, a similarity scaling for the crossflow in the clearance region is developed and a generalized description of the clearance vortex is derived. Calculations based on the similarity scaling agree well with a wide range of experimental data in regard to flow features such as crossflow velocity field, static pressure field, and tip clearance vortex trajectory.
    Keywords: AERODYNAMICS
    Type: ASME PAPER 90-GT-153 , ASME, Transactions, Journal of Turbomachinery (ISSN 0889-504X); 113; 260-269;
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  • 9
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    Numerical Simulations of High-Speed Chemically Reacting Flow (1994)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The Essentially NonOscillatory (ENO) shock-capturing scheme for the solution of hyperbolic equations is extended to solve a system of coupled conservation equations governing two-dimensional, time-dependent, compressible chemically reacting flow with full chemistry. The thermodynamic properties of the mixture are modeled accurately, and stiff kinetic terms are separated from the fluid motion by a fractional step algorithm. The methodology is used to study the concept of shock-induced mixing and combustion, a process by which the interaction of a shock wave with a jet of low-density hydrogen fuel enhances mixing through streamwise vorticity generation. Test cases with and without chemical reaction are explored here. Our results indicate that, in the temperature range examined, vorticity generation as well as the distribution of atomic species do not change significantly with the introduction of a chemical reaction and subsequent heat release. The actual diffusion of hydrogen is also relatively unaffected by the reaction process. This suggests that the fluid mechanics of this problem may be successfully decoupled from the combustion processes, and that computation of the mixing problem (without combustion chemistry) can elucidate much of the important physical features of the flow.
    Keywords: Fluid Mechanics and Heat Transfer
    Type: NASA-CR-203141 , NAS 1.26:203141 , Theoretical and Computational Fluid Dynamics; 6; 161-179
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
    Electronic Resource
    Electronic Resource
    Dynamics of Dusty Gases (1970)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Fluid Mechanics 2 (1970), S. 397-446 
    Details
    ISSN: 0066-4189
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.fl.02.010170.002145
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    Paper (German National Licenses)
    Fulltext
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