JavaFoil Users Guide mhaerotools.de（mhaerotools.de JavaFoil用户指南）.pdf

JAVAFOIL User’s Guide Martin Hepperle 3-March-2014 Contents Contents 1 JAVAFOIL 1 Limitations 2 JAVAFOIL’s Cards 3 The Geometry Card3 JAVA FOIL’S Geometry Generators 5 The Modify Card 17 The Flowfield Card 19 The Panel Method 21 Boundary Layer Analysis 22 Transition Criteria 22 Effect of Roughness 24 Stall Corrections 25 Compressible Flow 28 Critical Pressure Coefficient 28 Compressibility Corrections 28 Finite Wings in JAVAFOIL 29 Swept Wings in JAVAFOIL 34 The Aerodynamic Center 36 Effect of a Ground Surface 37 Effect of a Water Surface 38 Multi-Element Airfoils 40 Automating JAVAFOIL with a Script 41 References 42 Version History 43 JAVA FOIL JAVAFOIL is a relatively simple program, which uses several traditional methods for the analysis of airfoils in subsonic flow. 1 The main purpose of JAVAFOIL is to determine the lift, drag and moment characteristics of airfoils. The program will first calculate the distribution of the velocity on the surface of the airfoil. For this purpose it uses a potential flow analysis module which is based on a higher order panel method (linear varying vorticity distribution). This local velocity and the local pressure are related by the Bernoulli equation. In order to find the lift and the pitching moment coefficient the distribution of the pressure can be integrated along the surface. Next JAVAFOIL will calculate the behavior of the flow layer close to the airfoil surface (the boundary layer). The boundary layer analysis module (a so called integral method) steps along the upper and the lower surfaces of the