노치-백 自動車의 空氣力學的 臨界 現象에 관한 實驗的 硏究

Abstract

The aerodynamic critical phenomenon of notch-back type automobile-like bodies was investigated experimentally. The aerodynamic forces were measured for the various bodies of different back-light rake angle at Re=O.8xlO5, I.Ox106 and 1.4xI06. Also, surface flow visuali­zation was effected by the oil mixture. It was found that the critical phenomenon for the notch-back type bodies was milder than for the hatch-back type bodies; the drag vs. slant angle curve for the hotch-back type bodies exihibiting local maximum was much smoother. Surface oil flow visualization revealed that the flow pattern associated with the critical pheno­menon was characterized by the reattachment of the separated flow on the boot. The effect of the forebody on the critical phenomenon was seen to be negligible.