Prediction of Lateral Aerodynamic Loads on Fighter Aircraft at High Angles of Attack.

摘要

This report presents a brief summary of methods and experimental data developed over a four year period to predict the static lateral forces acting on a modern fighter-type aircraft at high angles of attack and small angles of sideslip characteristic of a departure flight attitude. The major part of the report is devoted to application of the methods to two aircraft configurations on which detailed data exist, comparison of the predicted and measured results, and evaluation of the comparisons. The configurations are a research V/STOL fighter configuration and the F-5 aircraft. Comparisons are made on nose vortex positions, circulation distributions in the separated region above the nose, flow velocities in the same region, and loads on the nose alone and complete configuration. Generally, the methods predict all of the correct behavior of these highly nonlinear and complicated flows. However, the agreement in many cases is not sufficiently good to consider the methods as satisfactory design or analysis techniques. Additional work is suggested to provide further verification and improvements.