Author : National Aeronautics and Space Adm Nasa
Release : 2018-11-06
Genre : Science
Kind : eBook
Book Rating : 952/5 ( reviews)
Book Synopsis Preliminary Subsonic Aerodynamic Model for Simulation Studies of the Hl-20 Lifting Body by : National Aeronautics and Space Adm Nasa
Download or read book Preliminary Subsonic Aerodynamic Model for Simulation Studies of the Hl-20 Lifting Body written by National Aeronautics and Space Adm Nasa. This book was released on 2018-11-06. Available in PDF, EPUB and Kindle. Book excerpt: A nonlinear, six-degree-of-freedom aerodynamic model for an early version of the HL-20 lifting body is described and compared with wind tunnel data upon which it is based. Polynomial functions describing most of the aerodynamic parameters are given and tables of these functions are presented. Techniques used to arrive at these functions are described. Basic aerodynamic coefficients were modeled as functions of angles of attack and sideslip. Vehicle lateral symmetry was assumed. Compressibility (Mach) effects were ignored. Control-surface effectiveness was assumed to vary linearly with angle of deflection and was assumed to be invariant with the angle of sideslip. Dynamic derivatives were obtained from predictive aerodynamic codes. Landing-gear and ground effects were scaled from Space Shuttle data. The model described is provided to support pilot-in-the-loop simulation studies of the HL-20. By providing the data in tabular format, the model is suitable for the data interpolation architecture of many existing engineering simulation facilities. Because of the preliminary nature of the data, however, this model is not recommended for study of the absolute performance of the HL-20. Jackson, E. Bruce and Cruz, Christopher I. Langley Research Center...