| タイトル | Investigation to advance prediction techniques of the low-speed aerodynamics of V/STOL aircraft |
| 本文（外部サイト） | http://hdl.handle.net/2060/19860014097 |
| 著者（英） | Maskew, B.; Dvorak, F. A.; Nathman, J.; Strash, D. |
| 著者所属（英） | Analytical Methods, Inc. |
| 発行日 | 1985-02-01 |
| 言語 | eng |
| 内容記述 | A computer program, VSAERO, has been applied to a number of V/STOL configurations with a view to advancing prediction techniques for the low-speed aerodynamic characteristics. The program couples a low-order panel method with surface streamline calculation and integral boundary layer procedures. The panel method--which uses piecewise constant source and doublet panels-includes an iterative procedure for wake shape and models boundary layer displacement effect using the source transpiration technique. Certain improvements to a basic vortex tube jet model were installed in the code prior to evaluation. Very promising results were obtained for surface pressures near a jet issuing at 90 deg from a flat plate. A solid core model was used in the initial part of the jet with a simple entrainment model. Preliminary representation of the downstream separation zone significantly improve the correlation. The program accurately predicted the pressure distribution inside the inlet on the Grumman 698-411 design at a range of flight conditions. Furthermore, coupled viscous/potential flow calculations gave very close correlation with experimentally determined operational boundaries dictated by the onset of separation inside the inlet. Experimentally observed degradation of these operational boundaries between nacelle-alone tests and tests on the full configuration were also indicated by the calculation. Application of the program to the General Dynamics STOL fighter design were equally encouraging. Very close agreement was observed between experiment and calculation for the effects of power on pressure distribution, lift and lift curve slope. |
| NASA分類 | AERODYNAMICS |
| レポートNO | 86N23568
NAS 1.26:166479
NASA-CR-166479 |
| 権利 | No Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/154345 |
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