Investigation of Advanced Counterrotation Blade Configuration Concepts for High Speed Turboprop Systems. Task 3 PDF Download
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Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781723186257
Category :
Languages : en
Pages : 112
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Book Description
A procedure is studied for generating three-dimensional grids for advanced turbofan engine fan section geometries. The procedure constructs a discrete mesh about engine sections containing the fan stage, an arbitrary number of axisymmetric radial flow splitters, a booster stage, and a bifurcated core/bypass flow duct with guide vanes. The mesh is an h-type grid system, the points being distributed with a transfinite interpolation scheme with axial and radial spacing being user specified. Elliptic smoothing of the grid in the meridional plane is a post-process option. The grid generation scheme is consistent with aerodynamic analyses utilizing the average-passage equation system developed by Dr. John Adamczyk of NASA Lewis. This flow solution scheme requires a series of blade specific grids each having a common axisymmetric mesh, but varying in the circumferential direction according to the geometry of the specific blade row. Crook, Andrew J. and Delaney, Robert A. Unspecified Center COMPUTATIONAL GRIDS; COMPUTERIZED SIMULATION; COUNTER ROTATION; GRID GENERATION (MATHEMATICS); PROPULSION SYSTEM CONFIGURATIONS; TURBOFAN ENGINES; USER MANUALS (COMPUTER PROGRAMS); ALGORITHMS; APPLICATIONS PROGRAMS (COMPUTERS); COMPUTATIONAL FLUID DYNAMICS; COMPUTER AIDED DESIGN; FLOW DISTRIBUTION; PROPELLER BLADES; TURBOPROP ENGINES...
Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781723186257
Category :
Languages : en
Pages : 112
Get Book Here
Book Description
A procedure is studied for generating three-dimensional grids for advanced turbofan engine fan section geometries. The procedure constructs a discrete mesh about engine sections containing the fan stage, an arbitrary number of axisymmetric radial flow splitters, a booster stage, and a bifurcated core/bypass flow duct with guide vanes. The mesh is an h-type grid system, the points being distributed with a transfinite interpolation scheme with axial and radial spacing being user specified. Elliptic smoothing of the grid in the meridional plane is a post-process option. The grid generation scheme is consistent with aerodynamic analyses utilizing the average-passage equation system developed by Dr. John Adamczyk of NASA Lewis. This flow solution scheme requires a series of blade specific grids each having a common axisymmetric mesh, but varying in the circumferential direction according to the geometry of the specific blade row. Crook, Andrew J. and Delaney, Robert A. Unspecified Center COMPUTATIONAL GRIDS; COMPUTERIZED SIMULATION; COUNTER ROTATION; GRID GENERATION (MATHEMATICS); PROPULSION SYSTEM CONFIGURATIONS; TURBOFAN ENGINES; USER MANUALS (COMPUTER PROGRAMS); ALGORITHMS; APPLICATIONS PROGRAMS (COMPUTERS); COMPUTATIONAL FLUID DYNAMICS; COMPUTER AIDED DESIGN; FLOW DISTRIBUTION; PROPELLER BLADES; TURBOPROP ENGINES...
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 126
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Author: Edward J. Hall
Publisher:
ISBN:
Category : Aerodynamics
Languages : en
Pages : 354
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ISBN:
Category :
Languages : en
Pages : 368
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ISBN:
Category :
Languages : en
Pages : 88
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Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781724264725
Category :
Languages : en
Pages : 218
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The primary objective of this study was the development of a time-marching three-dimensional Euler/Navier-Stokes aerodynamic analysis to predict steady and unsteady compressible transonic flows about ducted and unducted propfan propulsion systems employing multiple blade rows. The computer codes resulting from this study are referred to as ADPAC-AOACR (Advanced Ducted Propfan Analysis Codes-Angle of Attack Coupled Row). This report is intended to serve as a computer program user's manual for the ADPAC-AOACR codes developed under Task 5 of NASA Contract NAS3-25270, Unsteady Counterrotating Ducted Propfan Analysis. The ADPAC-AOACR program is based on a flexible multiple blocked grid discretization scheme permitting coupled 2-D/3-D mesh block solutions with application to a wide variety of geometries. For convenience, several standard mesh block structures are described for turbomachinery applications. Aerodynamic calculations are based on a four-stage Runge-Kutta time-marching finite volume solution technique with added numerical dissipation. Steady flow predictions are accelerated by a multigrid procedure. Numerical calculations are compared with experimental data for several test cases to demonstrate the utility of this approach for predicting the aerodynamics of modern turbomachinery configurations employing multiple blade rows. Hall, Edward J. and Delaney, Robert A. and Adamczyk, John J. and Miller, Christopher J. and Arnone, Andrea and Swanson, Charles Unspecified Center NASA-CR-187125, NAS 1.26:187125 NAS3-25270; RTOP 535-03-10...
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Category :
Languages : en
Pages : 220
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Author:
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Category :
Languages : en
Pages : 164
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Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781722604516
Category :
Languages : en
Pages : 78
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The computer program user's manual for the ADPACAPES (Advanced Ducted Propfan Analysis Code-Average Passage Engine Simulation) program is included. The objective of the computer program is development of a three-dimensional Euler/Navier-Stokes flow analysis for fan section/engine geometries containing multiple blade rows and multiple spanwise flow splitters. An existing procedure developed by Dr. J. J. Adamczyk and associates at the NASA Lewis Research Center was modified to accept multiple spanwise splitter geometries and simulate engine core conditions. The numerical solution is based upon a finite volume technique with a four stage Runge-Kutta time marching procedure. Multiple blade row solutions are based upon the average-passage system of equations. The numerical solutions are performed on an H-type grid system, with meshes meeting the requirement of maintaining a common axisymmetric mesh for each blade row grid. The analysis was run on several geometry configurations ranging from one to five blade rows and from one to four radial flow splitters. The efficiency of the solution procedure was shown to be the same as the original analysis. Crook, Andrew J. and Delaney, Robert A. Unspecified Center...
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Category :
Languages : en
Pages : 124
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