Duct Flow Analysis Methods for V/STOL Propulsion System Application.

摘要

This investigation was concerned with aerodynamic analysis methods for non-rotating elements of the flow path in lift/thrust-vectoring/propulsion systems for V/STOL aircraft. The character of the flows which occur in these systems in current and projected V/STOL aircraft was examined, and a broad spectrum of design methods was considered. These ranged from simple, one-dimensional calculations with high empirical content to recently developed internal turbulent flow field computational models. Special emphasis was placed on evaluation of the status of the more advanced computational methods, so that realistic objectives might be established for planning future programs. The most difficult of the presently unresolved problems in adaptation of internal flow computation models to general flow passage analysis appear to lie in the development of turbulence models and in the complex nature of real duct geometry.