Fighter Aerodynamic Design Method Research

Being based on a certain fighter and a triplan, this assay studied the way of universal apply on fighter aircraft lift-drag ratio design nowadays , which include wind tunnel experiment, fluid state and numerical simulation. This assay combination with wind tunnel experiment, fluid state and numerical simulation. The combination was used to study lift-drag ratio of a fighter, and then give a practical guide line on aero configuration design.> The experiment studies as follows:1. The models of the experiments were a certain fighter and a triplan .The triplan is the prototype with a canard wing, others are the same.2. The water tunnel experiment. The change of characters of eddy with angle of attack were studied by ink demonstration.Wind and water tunnel experiment indicated that the most important reason of decrease of lift coefficient and pitching-moment coefficient at big angle of attack was eddy break.3. The wind tunnel experiment. The drag, lift and pitching moment of two models were obtained by force experiment. Then the lift coefficient curve, drag coefficient curve and pitching-moment coefficient curve were obtained.> The numerical simulation studies as follows1. Modeling. This article carries on the modeling with UG. The surface and the curve function of UG are suitable for the aircraft extremely. Because of the limited memory of computer, author neglected certain details whose influence are very small to the simulation , for instance polishing of wing tip and the part between wing and fuselage. This can have some influences to the computed result, but regarding this article, these influences can be neglected.2. Meshing. The mesh was established with pre-disposal of this CFD software. This software is very efficiency to establish unstructured grid. It's tools are very convenient to establish unstructured grid used in this assay.3. Numerical simulation. Numerical simulation software was a CFD software. This is because it's human man -machine interactive surface, rapid convergence and exact result to chose this software.> The synthetically analysis as follows:1. Analysis between experimental result and Numerical simulation result. Numerical simulation to the lift coefficient and drag coefficient were already accurate to...