自動車の高速直進安定性に影響する車体周りの非定常流れ特性(流体工学,流体機械)

概要

論文の詳細を見る
In vehicle development, it is generally said that a vehicle with lower aerodynamic lift coefficient C_L has better straight-ahead stability at high-speed. However, in some cases, straight-ahead stability differs between two vehicles with similar low C_L. On the other hand, a moving vehicle shows complex behaviors due to unsteady aerodynamic forces caused by unsteady flow around the vehicle and unsteady vibration induced by undulated road. As C_L simply indicates time-average, it could be considered that C_L may not fully describe such complex vehicle behaviors during high speed driving. Therefore. in this study, an attempt was made to clarify the relationship between unsteady flow around a moving vehicle and straight-ahead stability by investigating aerodynamic forces generated from unsteady flow. As a result, it is clarified in wind tunnel experiments and on-road driving experiments that vehicle straight-ahead stability is greatly influenced by a distinctive unsteady vortex structure above the trunk deck.
社団法人日本機械学会の論文
2009-06-25