CAATS - Automotive Wind Tunnel Test Techniques

Abstract

<div class="section abstract"><div class="htmlview paragraph">This paper contributes to the Committee on Commonized Aerodynamics Automotive Testing Standards (CAATS) initiative, established by the late Gary Elfstrom. It is collaboratively compiled by automotive wind tunnel users and operators within the Subsonic Aerodynamic Testing Association (SATA). Its specific focus lies in automotive wind tunnel test techniques, encompassing both those relevant to passenger car and race car development. It is part of the comprehensive CAATS series, which addresses not only test techniques but also wind tunnel calibration, uncertainty analysis, and wind tunnel correction methods.</div><div class="htmlview paragraph">The core objective of this paper is to furnish comprehensive guidelines for wind tunnel testing and associated techniques. It begins by elucidating the initial wind tunnel setup and vehicle arrangement within it. Subsequently, it delves into a diverse array of test techniques, encompassing aerodynamic force measurements, ventilation drag assessments, flow field analyses, and surface flow visualizations.</div><div class="htmlview paragraph">A foundational reference point for aerodynamic force measurements is established through the referencing of the WLTP standard. This not only provides a baseline but also outlines prerequisites vital for wind tunnel compliance, guiding the testing process effectively.</div><div class="htmlview paragraph">Overall, this paper contributes significantly to the understanding and implementation of standardized practices within the realm of automotive wind tunnel testing.</div></div>