A Nonlinear Indicial Response model for forebody tangential blowing at high angles of attack

摘要

This paper presents the development of a nonlinear aerodynamic model that describes the impact of forebody tangential blowing (FTB) on the generated roll moment for a fixed aircraft attitude. ^This model uses Nonlinear Indicial Responses (NIRs) and incorporates physical insight gained from experimental data. ^The model accounts for the nonlinear aerodynamic behavior observed when FTB is applied at high angles of attack. ^Its predictions for the roll moment generated by FTB are compared to actual data and a model that uses a first-order lag of the static loads. ^The NIP model is found to provide a better prediction of the measured transient response. ^Experimental results used in the model's development are discussed. ^They include flow visualization, as well as static and dynamic measurements of the aerodynamic loads for various roll angles and blowing mass flow rates. ^The experimental apparatus used in this study is described; it consists of an FTB-equipped wind tunnel model which is free to roll. ^The model is a wing-body combination with slots on the forebody for tangential blowing and is nominally set at 45-deg angie of attack. ^(Author)