Flow Prediction for Propfan Engine Installation Effects on Transport Aircraft at Transonic Speeds
Langley Research Center, 1986 - 96 pages
An Euler-based method for aerodynamic analysis of turboprop transport aircraft at transonic speeds has been developed. In this method, inviscid Euler equations are solved over surface-fitted grids constructed about aircraft configurations. Propeller effects are simulated by specifying sources of momentum and energy on an actuator disc located in place of the propeller. A stripwise boundary layer procedure is included to account for the viscous effects. A preliminary version of an approach to embed the exhaust plume within the global Euler solution has also been developed for more accurate treatment of the exhaust flow. The resulting system of programs is capable of handling wing-body-nacelle-propeller configurations. The propeller disks may be tractors or pushers and may represent single or counterrotation propellers. Results from analyses of three test cases of interest (a wing alone, a wing-body-nacelle model, and a wing-nacelle-endplate model) are presented. A user's manual for executing the system of computer programs with formats of various input files, sample job decks, and sample input files is provided in appendices.
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Timing Data for Scalar and Vector Versions of the Propfan Euler Code
A The Files Used for Data Transfer Among Various Segments of the Program
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1-80 Header card AIAA airfoil Boeing Commercial Airplane boundary condition boundary layer chord coarsest mesh common boundary computational domain configuration Control Data Corporation counter CYBER Displacement Thickness downstream Euler Equations exhaust flow exhaust plume field is left Flow Grid flowfield flux fuselage geometry grid cells grid embedding grid generation program grid planes inboard input cards input file inviscid JOB CONTROL DECK leading edge lower section curve Mach number method nacelle is present nacelle surface Name Description nondimensionalized nonzero number of cells Number of grid Number of points Parameter specifying physical plane plane of interest plane that user PRGRD11 program will default Propeller Disk Propfan PRPOST pusher pusher configuration Recommended value region SAMANT simulated specifying the presence step 1a TAPE2 TAPE4 tractor tractor configuration Transonic Turboprop upper section curve user wishes vector velocity volume grid wing section wing surface grid Wing-Mounted wishes to extract y/c coordinate YSYM