G303 感圧塗料を用いた単純自動車模型まわりの流れ場計測(2)(GS-3 流体計測,一般セッション)

概要

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Yawing moment and side force affect behavior of an automobile in crosswind. In wind tunnel testing, these aerodynamic forces are usually measured using a strain-gage balance. However, using Pressure-Sensitive Paint (PSP), we can measure surface pressure and obtain the force acting on each surface. In the present study, pressure distribution on top and four side surfaces of a simplified car model (1/10 scale Ahmed model) was measured using PSP at yaw angle ψ= 0 and 20[deg]. As a result, we could correlate the negative pressure regions appeared in the PSP images with separated regions and vortices shown in oil flow. In the case of ψ= 20[deg], it was shown that pressure difference between the leeward side and the windward side produced unstable yawing moment.
2006-10-28