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S8 Engenharia Aeroespacial |
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Title:
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NUMERICAL INVESTIGATION UPON THE NO FORMATION IN H2-AIR IGNITION IN THE SUPERSONIC UNSTEADY SPATIAL MIXING LAYER
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Summary :
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IN THIS WORK IS ANALYZED THE NO FORMATION, AS FUNCTION OF TEMPERATURE, IN DIFFUSIVE TURBULENT FLAMES OF HYDROGEN, FOR SUCH, ARE USED DETAILED CHEMICAL AND TRANSPORT MECHANISMS AND THE COMPLETE TWO-DIMENSIONAL GOVERNING EQUATIONS IN THEIR CONSERVATIVE FORMS. THE RATES OF THE CHEMICAL REACTIONS, THE THERMODYNAMIC AND TRANSPORT PROPERTIES ARE CALCULATED BY THE SOFTWARES CHEMKIN AND PACKAGE FOR EVALUATION OF THE TRANSPORT PROPERTIES, BOTH DEVELOPED BY SANDIA NATIONAL LABORATORIES. IN THIS STUDY THE LARGE EDDY SIMULATION TECHNIQUE IS USED AND FOR SOLUTION OF THE SYSTEM OF EQUATIONS, FORMED BY THE GOVERNING EQUATIONS, IT WAS APPLIED THE COLLOCATION SPECTRAL ELEMENTS METHOD WITH POLYNOMIALS OF CHEBYSHEV. IT WAS INTRODUCED A SMOOTHING PROCESS, CONTROLLED BY A SENSOR, TO REDUCE THE SPURIOUS OSCILLATIONS IN THE NUMERICAL SOLUTION, IN ORDER TO CHARACTERIZE THE RESIDUAL TURBULENCE WHITE NOISES WERE INTRODUCED. IT WAS OBSERVED THAT THERE ARE NOT SIGNIFICANT CHANGES IN THE FLOW STRUCTURE, IN THE LEVEL OF CONCENTRATION OF THE MAJOR INTERMEDIATE SPECIES (O, OH AND H) AND IN THE NO CONCENTRATION WHEN THE TEMPERATURE OF THE FUEL STREAM IS INCREASED.
KEY WORDS: SUPERSONIC IGNITION, COMBUSTION, MIXING LAYER, AND SUPERSONIC FLOW. |
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Author :
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Biage, Milton 0
de Faria, Adriana Ferreira
Silva Júnior, Paulo Lopes
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Paper View :
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