Browse Publications Technical Papers 2019-28-0025
2019-10-11

Aerodynamic analysis on under body drag and vehicle performance of active front spoiler for high CG vehicles 2019-28-0025

Vehicle aerodynamic drag reduction is the effective technique to enhance the fuel economy, performance and top speed of a vehicle. The contribution of the under body parts like wheels, wheel arch and wheel housing accounts for about 40-50% of the total drag of a car, which further increases in case of vehicles with higher CG. Thus, it seems logical to focus attention on the under body aerodynamic drag reduction. In this study an active spoiler is placed towards the front end of the vehicle which will divert the air flow from front towards the radiator. The active spoiler revolves according to the signals received from the radar sensors placed at the lower end to detect obstacles which will prevent it from damage. The objective of this study is to examine the effect of the air flow diversion on under body drag. The effect of air flow diversion on fuel consumption, radiator effectiveness and top speed is numerically evaluated. A Renault Duster model is considered for the study as base model designed in DS Solidworks 2018 (pre-processor) and analyzed in STAR-CCM+ (post-processor). The different spoiler angle configurations have been analyzed to obtain the optimum spoiler angle and the performance is compared with base model. The spoiler efficiency is obtained in terms of drag values from the STAR-CCM+. The results show that at 60o angle the spoiler is most effective in reducing overall aerodynamic drag by 9% from the base value. Furthermore, it results into increase in top speed by 3.28%, radiator effectiveness by 6.25% and reduction in fuel consumption by 9.23%.

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