An exploratory study using a formally designed wind tunnel experiment for aerodynamic characterization of a performance automobile was conducted in the LFST. A Design of Experiments (DOE) approach to wind tunnel testing of performance automobiles is being explored at the Langley Full-Scale Tunnel. Traditional methods for wind tunnel testing have focused on conventional 'one factor at a time' (OFAT) methods which have difficulty in unearthing valuable interactive effects between variables. In an effort to better characterize a vehicle's aerodynamic behaviour as a function of common variables, an exploratory study was completed using the DOE methodology for a common sedan racecar. A two-level factorial designed experiment with center points produced regression models for the lift, drag, and lift to drag ratio as a function of ride height, grille porosity, and yaw angle. In addition, model adequacy and uncertainty levels were described. Regression models to predict lift at the front and rear axes, drag, and lift to drag ratio were obtained for four input factors: front and rear ride height, yaw angle, and radiator grille porosity. Interactions between factors were discovered in the rear lift and lift to drag responses which would have been overlooked in a traditional OFAT approach to testing. Future work will focus on analysis of designed experiments with restricted randomization in an effort to reduce the number of changes to the test article.
Use of designed experiments in wind tunnel testing of performance automobiles
Der Einsatz von Experimenten, die für Windkanäle entwickelt wurden, zum Leistungstest von Automobilen
2002
8 Seiten, 9 Bilder, 5 Tabellen, 10 Quellen
Conference paper
English
Use of Designed Experiments in Wind Tunnel Testing of Performance Automobiles
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