Open AccessPrediction of transients and control reactions in a transonic wind tunnel
Author(s) -
João Batista Pessoa Falcão Filho,
Marcos Ortega,
Luiz Carlos Sandoval Góes
Publication year - 2000
Publication title -
revista brasileira de ciências mecânicas
Language(s) - English
Resource type - Journals
ISSN - 0100-7386
DOI - 10.1590/s0100-73862000000200014
Subject(s) - transonic , wind tunnel , hypersonic wind tunnel , aerodynamics , subsonic and transonic wind tunnel , mach number , supersonic wind tunnel , mechanics , engineering , control theory (sociology) , aerospace engineering , computer science , physics , control (management) , artificial intelligence
This work describes a lumped parameter mathematical model for the prediction of transients in an aerodynamic circuit of a transonic wind tunnel. Control actions to properly handle those perturbations are also assessed. The tunnel circuit technology is up to date and incorporates a novel feature: high-enthalpy air injection to extend the tunnel’s Reynolds number capability. The model solves the equations of continuity, energy and momentum and defines density, internal energy and mass flow as the basic parameters in the aerodynamic study as well as Mach number, stagnation pressure and stagnation temperature, all referred to test section conditions, as the main control variables. The tunnel circuit response to control actions and the stability of the flow are numerically investigated. Initially, for validation purposes, the code was applied to the AWT ("Altitude Wind Tunnel" of NASA-Lewis). In the sequel, the Brazilian transonic wind tunnel was investigated, with all the main control systems modeled, including injection